version 7.3

until-loop condition now also simplified to avoid stack-eval
introduce option to use internal scratch variables via prog8_lib definitions (ony for compiler, not for user code!)
2026-10-22 20:02:27 +00:00 · 2021-11-14 22:55:13 +01:00 · 2021-11-14 22:51:02 +01:00 · 2021-11-14 16:01:54 +01:00 · 2021-11-14 12:38:56 +01:00 · 2021-11-14 12:23:46 +01:00
89 changed files with 5004 additions and 3830 deletions
@@ -0,0 +1,22 @@
+<component name="libraryTable">
+  <library name="io.kotest.assertions.core.jvm" type="repository">
+    <properties maven-id="io.kotest:kotest-assertions-core-jvm:4.6.3" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-core-jvm/4.6.3/kotest-assertions-core-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.5.0/kotlin-stdlib-jdk8-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/1.5.0/kotlin-stdlib-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.5.0/kotlin-stdlib-jdk7-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-shared-jvm/4.6.3/kotest-assertions-shared-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/github/java-diff-utils/java-diff-utils/4.9/java-diff-utils-4.9.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-coroutines-jdk8/1.5.0/kotlinx-coroutines-jdk8-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-reflect/1.5.0/kotlin-reflect-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-coroutines-core-jvm/1.5.0/kotlinx-coroutines-core-jvm-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-common/1.5.0/kotlin-stdlib-common-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-common-jvm/4.6.3/kotest-common-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-api-jvm/4.6.3/kotest-assertions-api-jvm-4.6.3.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>
@@ -0,0 +1,24 @@
+<component name="libraryTable">
+  <library name="io.kotest.property.jvm" type="repository">
+    <properties maven-id="io.kotest:kotest-property-jvm:4.6.3" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-property-jvm/4.6.3/kotest-property-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.5.0/kotlin-stdlib-jdk8-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/1.5.0/kotlin-stdlib-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.5.0/kotlin-stdlib-jdk7-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-common-jvm/4.6.3/kotest-common-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-shared-jvm/4.6.3/kotest-assertions-shared-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-api-jvm/4.6.3/kotest-assertions-api-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-coroutines-jdk8/1.5.0/kotlinx-coroutines-jdk8-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/github/java-diff-utils/java-diff-utils/4.9/java-diff-utils-4.9.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/github/mifmif/generex/1.0.2/generex-1.0.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/dk/brics/automaton/automaton/1.11-8/automaton-1.11-8.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-reflect/1.5.0/kotlin-reflect-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-coroutines-core-jvm/1.5.0/kotlinx-coroutines-core-jvm-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-common/1.5.0/kotlin-stdlib-common-1.5.0.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>
@@ -0,0 +1,56 @@
+<component name="libraryTable">
+  <library name="io.kotest.runner.junit5.jvm" type="repository">
+    <properties maven-id="io.kotest:kotest-runner-junit5-jvm:4.6.3" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-runner-junit5-jvm/4.6.3/kotest-runner-junit5-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-framework-api-jvm/4.6.3/kotest-framework-api-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-shared-jvm/4.6.3/kotest-assertions-shared-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/github/java-diff-utils/java-diff-utils/4.9/java-diff-utils-4.9.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-common-jvm/4.6.3/kotest-common-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-framework-engine-jvm/4.6.3/kotest-framework-engine-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/github/classgraph/classgraph/4.8.105/classgraph-4.8.105.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/github/ajalt/mordant/1.2.1/mordant-1.2.1.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/com/github/ajalt/colormath/1.2.0/colormath-1.2.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-script-util/1.5.0/kotlin-script-util-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/intellij/deps/trove4j/1.0.20181211/trove4j-1.0.20181211.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-daemon-client/1.5.0/kotlin-daemon-client-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-coroutines-core/1.3.8/kotlinx-coroutines-core-1.3.8.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-scripting-jvm/1.5.0/kotlin-scripting-jvm-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-scripting-common/1.5.0/kotlin-scripting-common-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/opentest4j/opentest4j/1.2.0/opentest4j-1.2.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-framework-discovery-jvm/4.6.3/kotest-framework-discovery-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-core-jvm/4.6.3/kotest-assertions-core-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-coroutines-jdk8/1.5.0/kotlinx-coroutines-jdk8-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-assertions-api-jvm/4.6.3/kotest-assertions-api-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-extensions-jvm/4.6.3/kotest-extensions-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/commons-io/commons-io/2.6/commons-io-2.6.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk/1.9.3/mockk-1.9.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-common/1.9.3/mockk-common-1.9.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-dsl/1.9.3/mockk-dsl-1.9.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-dsl-jvm/1.9.3/mockk-dsl-jvm-1.9.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-agent-jvm/1.9.3/mockk-agent-jvm-1.9.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-agent-api/1.9.3/mockk-agent-api-1.9.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/mockk/mockk-agent-common/1.9.3/mockk-agent-common-1.9.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/objenesis/objenesis/3.0.1/objenesis-3.0.1.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/net/bytebuddy/byte-buddy/1.9.10/byte-buddy-1.9.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/net/bytebuddy/byte-buddy-agent/1.9.10/byte-buddy-agent-1.9.10.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/io/kotest/kotest-framework-concurrency-jvm/4.6.3/kotest-framework-concurrency-jvm-4.6.3.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlinx/kotlinx-coroutines-core-jvm/1.5.0/kotlinx-coroutines-core-jvm-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-common/1.5.0/kotlin-stdlib-common-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-engine/1.6.2/junit-platform-engine-1.6.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/apiguardian/apiguardian-api/1.1.0/apiguardian-api-1.1.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-commons/1.6.2/junit-platform-commons-1.6.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-suite-api/1.6.2/junit-platform-suite-api-1.6.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-launcher/1.6.2/junit-platform-launcher-1.6.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-api/5.6.2/junit-jupiter-api-5.6.2.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.5.0/kotlin-stdlib-jdk8-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/1.5.0/kotlin-stdlib-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.5.0/kotlin-stdlib-jdk7-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-script-runtime/1.5.0/kotlin-script-runtime-1.5.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-reflect/1.5.0/kotlin-reflect-1.5.0.jar!/" />
+    </CLASSES>
+    <JAVADOC />
+    <SOURCES />
+  </library>
+</component>
@@ -16,7 +16,10 @@
      </list>
    </option>
  </component>
+  <component name="FrameworkDetectionExcludesConfiguration">
+    <type id="Python" />
+  </component>
  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" project-jdk-name="Kotlin SDK" project-jdk-type="KotlinSDK">
    <output url="file://$PROJECT_DIR$/out" />
  </component>
-</project>
+</project>
@@ -0,0 +1,29 @@
+# .readthedocs.yaml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the version of Python and other tools you might need
+build:
+  os: ubuntu-20.04
+  tools:
+    python: "3.9"
+    # You can also specify other tool versions:
+    # nodejs: "16"
+    # rust: "1.55"
+    # golang: "1.17"
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+  configuration: docs/source/conf.py
+
+# If using Sphinx, optionally build your docs in additional formats such as PDF
+formats:
+  - pdf
+
+# Optionally declare the Python requirements required to build your docs
+python:
+  install:
+    - requirements: docs/requirements.txt
@@ -3,6 +3,7 @@ plugins {
    id 'java'
    id 'application'
    id "org.jetbrains.kotlin.jvm"
+    id "io.kotest" version "0.3.8"
 }

 java {
@@ -18,11 +19,7 @@ dependencies {
    // implementation "org.jetbrains.kotlin:kotlin-reflect"
    implementation "com.michael-bull.kotlin-result:kotlin-result-jvm:1.1.12"

-    testImplementation "org.jetbrains.kotlin:kotlin-test-junit5"
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.2'
-    testImplementation 'org.hamcrest:hamcrest:2.2'
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.2'
-
+    testImplementation 'io.kotest:kotest-runner-junit5-jvm:4.6.3'
 }

 sourceSets {
@@ -43,7 +40,6 @@ sourceSets {


 test {
-    // Enable JUnit 5 (Gradle 4.6+).
    useJUnitPlatform()

    // Always run tests, even when nothing changed.
@@ -13,7 +13,7 @@
    <orderEntry type="library" name="michael.bull.kotlin.result.jvm" level="project" />
    <orderEntry type="module" module-name="compilerInterfaces" />
    <orderEntry type="module" module-name="compilerAst" />
-    <orderEntry type="library" scope="TEST" name="hamcrest" level="project" />
-    <orderEntry type="library" name="junit.jupiter" level="project" />
+    <orderEntry type="library" name="io.kotest.runner.junit5.jvm" level="project" />
+    <orderEntry type="library" name="io.kotest.assertions.core.jvm" level="project" />
  </component>
 </module>
@@ -118,15 +118,15 @@ private fun optimizeSameAssignments(linesByFourteen: List<List<IndexedValue<Stri
    // @todo a better place to do this is in the Compiler instead and transform the Ast, or the AsmGen, and never even create the inefficient asm in the first place...

    val mods = mutableListOf<Modification>()
-    for (pair in linesByFourteen) {
-        val first = pair[0].value.trimStart()
-        val second = pair[1].value.trimStart()
-        val third = pair[2].value.trimStart()
-        val fourth = pair[3].value.trimStart()
-        val fifth = pair[4].value.trimStart()
-        val sixth = pair[5].value.trimStart()
-        val seventh = pair[6].value.trimStart()
-        val eighth = pair[7].value.trimStart()
+    for (lines in linesByFourteen) {
+        val first = lines[0].value.trimStart()
+        val second = lines[1].value.trimStart()
+        val third = lines[2].value.trimStart()
+        val fourth = lines[3].value.trimStart()
+        val fifth = lines[4].value.trimStart()
+        val sixth = lines[5].value.trimStart()
+        val seventh = lines[6].value.trimStart()
+        val eighth = lines[7].value.trimStart()

        if(first.startsWith("lda") && second.startsWith("ldy") && third.startsWith("sta") && fourth.startsWith("sty") &&
                fifth.startsWith("lda") && sixth.startsWith("ldy") && seventh.startsWith("sta") && eighth.startsWith("sty")) {
@@ -136,8 +136,8 @@ private fun optimizeSameAssignments(linesByFourteen: List<List<IndexedValue<Stri
            val fourthvalue = sixth.substring(4)
            if(firstvalue==thirdvalue && secondvalue==fourthvalue) {
                // lda/ldy   sta/sty   twice the isSameAs word -->  remove second lda/ldy pair (fifth and sixth lines)
-                mods.add(Modification(pair[4].index, true, null))
-                mods.add(Modification(pair[5].index, true, null))
+                mods.add(Modification(lines[4].index, true, null))
+                mods.add(Modification(lines[5].index, true, null))
            }
        }

@@ -146,7 +146,7 @@ private fun optimizeSameAssignments(linesByFourteen: List<List<IndexedValue<Stri
            val secondvalue = third.substring(4)
            if(firstvalue==secondvalue) {
                // lda value / sta ? / lda isSameAs-value / sta ?  -> remove second lda (third line)
-                mods.add(Modification(pair[2].index, true, null))
+                mods.add(Modification(lines[2].index, true, null))
            }
        }

@@ -154,12 +154,12 @@ private fun optimizeSameAssignments(linesByFourteen: List<List<IndexedValue<Stri
                fifth.startsWith("lda") && sixth.startsWith("ldy") &&
                (seventh.startsWith("jsr  floats.copy_float") || seventh.startsWith("jsr  cx16flt.copy_float"))) {

-            val nineth = pair[8].value.trimStart()
-            val tenth = pair[9].value.trimStart()
-            val eleventh = pair[10].value.trimStart()
-            val twelveth = pair[11].value.trimStart()
-            val thirteenth = pair[12].value.trimStart()
-            val fourteenth = pair[13].value.trimStart()
+            val nineth = lines[8].value.trimStart()
+            val tenth = lines[9].value.trimStart()
+            val eleventh = lines[10].value.trimStart()
+            val twelveth = lines[11].value.trimStart()
+            val thirteenth = lines[12].value.trimStart()
+            val fourteenth = lines[13].value.trimStart()

            if(eighth.startsWith("lda") && nineth.startsWith("ldy") && tenth.startsWith("sta") && eleventh.startsWith("sty") &&
                    twelveth.startsWith("lda") && thirteenth.startsWith("ldy") &&
@@ -167,14 +167,128 @@ private fun optimizeSameAssignments(linesByFourteen: List<List<IndexedValue<Stri

                if(first.substring(4) == eighth.substring(4) && second.substring(4)==nineth.substring(4)) {
                    // identical float init
-                    mods.add(Modification(pair[7].index, true, null))
-                    mods.add(Modification(pair[8].index, true, null))
-                    mods.add(Modification(pair[9].index, true, null))
-                    mods.add(Modification(pair[10].index, true, null))
+                    mods.add(Modification(lines[7].index, true, null))
+                    mods.add(Modification(lines[8].index, true, null))
+                    mods.add(Modification(lines[9].index, true, null))
+                    mods.add(Modification(lines[10].index, true, null))
                }
            }
        }
+
+        var overlappingMods = false
+        /*
+        sta  prog8_lib.retval_intermX      ; remove
+        sty  prog8_lib.retval_intermY      ; remove
+        lda  prog8_lib.retval_intermX      ; remove
+        ldy  prog8_lib.retval_intermY      ; remove
+        sta  A1
+        sty  A2
+         */
+        if(first.startsWith("st") && second.startsWith("st")
+            && third.startsWith("ld") && fourth.startsWith("ld")
+            && fifth.startsWith("st") && sixth.startsWith("st")) {
+            val reg1 = first[2]
+            val reg2 = second[2]
+            val reg3 = third[2]
+            val reg4 = fourth[2]
+            val reg5 = fifth[2]
+            val reg6 = sixth[2]
+            if (reg1 == reg3 && reg1 == reg5 && reg2 == reg4 && reg2 == reg6) {
+                val firstvalue = first.substring(4)
+                val secondvalue = second.substring(4)
+                val thirdvalue = third.substring(4)
+                val fourthvalue = fourth.substring(4)
+                if(firstvalue.contains("prog8_lib.retval_interm") && secondvalue.contains("prog8_lib.retval_interm")
+                    && firstvalue==thirdvalue && secondvalue==fourthvalue) {
+                    mods.add(Modification(lines[0].index, true, null))
+                    mods.add(Modification(lines[1].index, true, null))
+                    mods.add(Modification(lines[2].index, true, null))
+                    mods.add(Modification(lines[3].index, true, null))
+                    overlappingMods = true
+                }
+            }
+        }
+
+        /*
+        sta  A1
+        sty  A2
+        lda  A1     ; can be removed
+        ldy  A2     ; can be removed if not followed by a branch instuction
+         */
+        if(!overlappingMods && first.startsWith("st") && second.startsWith("st")
+            && third.startsWith("ld") && fourth.startsWith("ld")) {
+            val reg1 = first[2]
+            val reg2 = second[2]
+            val reg3 = third[2]
+            val reg4 = fourth[2]
+            if(reg1==reg3 && reg2==reg4) {
+                val firstvalue = first.substring(4)
+                val secondvalue = second.substring(4)
+                val thirdvalue = third.substring(4)
+                val fourthvalue = fourth.substring(4)
+                if(firstvalue==thirdvalue && secondvalue == fourthvalue) {
+                    overlappingMods = true
+                    mods.add(Modification(lines[2].index, true, null))
+                    if(!fifth.startsWith('b'))
+                        mods.add(Modification(lines[3].index, true, null))
+                }
+            }
+        }
+        /*
+        sta  A1
+        sty  A2
+        lda  A1     ; can be removed if not followed by a branch instruction
+         */
+        if(!overlappingMods && first.startsWith("st") && second.startsWith("st")
+            && third.startsWith("ld") && !fourth.startsWith("b")) {
+            val reg1 = first[2]
+            val reg3 = third[2]
+            if(reg1==reg3) {
+                val firstvalue = first.substring(4)
+                val thirdvalue = third.substring(4)
+                if(firstvalue==thirdvalue) {
+                    overlappingMods = true
+                    mods.add(Modification(lines[2].index, true, null))
+                }
+            }
+        }
+        /*
+        sta  A1
+        <other st/ld instruction not involving A1>
+        sta  A1     ; can be removed
+         */
+        if(!overlappingMods && first.startsWith("st") && third.startsWith("st")) {
+            val reg1 = first[2]
+            val reg3 = third[2]
+            if(reg1==reg3 && (second.startsWith("ld") || second.startsWith("st"))) {
+                val firstvalue = first.substring(4)
+                val secondvalue = second.substring(4)
+                val thirdvalue = third.substring(4)
+                if(firstvalue==thirdvalue && firstvalue!=secondvalue) {
+                    overlappingMods = true
+                    mods.add(Modification(lines[2].index, true, null))
+                }
+            }
+        }
+        /*
+        sta  A1
+        ldy  A1     ; make tay
+        sta  A1     ; remove
+         */
+        if(!overlappingMods && first.startsWith("sta") && second.startsWith("ld")
+            && third.startsWith("sta") && second.length>4) {
+            val firstvalue = first.substring(4)
+            val secondvalue = second.substring(4)
+            val thirdvalue = third.substring(4)
+            if(firstvalue==secondvalue && firstvalue==thirdvalue) {
+                overlappingMods = true
+                val reg2 = second[2]
+                mods.add(Modification(lines[1].index, false, "  ta$reg2"))
+                mods.add(Modification(lines[2].index, true, null))
+            }
+        }
    }
+
    return mods
 }

@@ -182,9 +296,9 @@ private fun optimizeStoreLoadSame(linesByFour: List<List<IndexedValue<String>>>)
    // sta X + lda X,  sty X + ldy X,   stx X + ldx X  -> the second instruction can OFTEN be eliminated
    // TODO this is not true if X is not a regular RAM memory address (but instead mapped I/O or ROM) but how does this code know?
    val mods = mutableListOf<Modification>()
-    for (pair in linesByFour) {
-        val first = pair[0].value.trimStart()
-        val second = pair[1].value.trimStart()
+    for (lines in linesByFour) {
+        val first = lines[1].value.trimStart()
+        val second = lines[2].value.trimStart()

        if ((first.startsWith("sta ") && second.startsWith("lda ")) ||
                (first.startsWith("stx ") && second.startsWith("ldx ")) ||
@@ -196,14 +310,25 @@ private fun optimizeStoreLoadSame(linesByFour: List<List<IndexedValue<String>>>)
                (first.startsWith("sty ") && second.startsWith("ldy ")) ||
                (first.startsWith("stx ") && second.startsWith("ldx "))
        ) {
-            val third = pair[2].value.trimStart()
-            if(!third.startsWith("b")) {
-                // no branch instruction follows, we can potentiall remove the load instruction
+            val third = lines[3].value.trimStart()
+            val attemptRemove =
+                if(third.startsWith("b")) {
+                    // a branch instruction follows, we can only remove the load instruction if
+                    // another load instruction of the same register precedes the store instruction
+                    // (otherwise wrong cpu flags are used)
+                    val loadinstruction = second.substring(0, 3)
+                    lines[0].value.trimStart().startsWith(loadinstruction)
+                }
+                else {
+                    // no branch instruction follows, we can remove the load instruction
+                    true
+                }
+
+            if(attemptRemove) {
                val firstLoc = first.substring(4).trimStart()
                val secondLoc = second.substring(4).trimStart()
-                if (firstLoc == secondLoc) {
-                    mods.add(Modification(pair[1].index, true, null))
-                }
+                if (firstLoc == secondLoc)
+                    mods.add(Modification(lines[2].index, true, null))
            }
        }
    }
@@ -213,15 +338,15 @@ private fun optimizeStoreLoadSame(linesByFour: List<List<IndexedValue<String>>>)
 private fun optimizeIncDec(linesByFour: List<List<IndexedValue<String>>>): List<Modification> {
    // sometimes, iny+dey / inx+dex / dey+iny / dex+inx sequences are generated, these can be eliminated.
    val mods = mutableListOf<Modification>()
-    for (pair in linesByFour) {
-        val first = pair[0].value
-        val second = pair[1].value
+    for (lines in linesByFour) {
+        val first = lines[0].value
+        val second = lines[1].value
        if ((" iny" in first || "\tiny" in first) && (" dey" in second || "\tdey" in second)
                || (" inx" in first || "\tinx" in first) && (" dex" in second || "\tdex" in second)
                || (" dey" in first || "\tdey" in first) && (" iny" in second || "\tiny" in second)
                || (" dex" in first || "\tdex" in first) && (" inx" in second || "\tinx" in second)) {
-            mods.add(Modification(pair[0].index, true, null))
-            mods.add(Modification(pair[1].index, true, null))
+            mods.add(Modification(lines[0].index, true, null))
+            mods.add(Modification(lines[1].index, true, null))
        }
    }
    return mods
@@ -230,12 +355,12 @@ private fun optimizeIncDec(linesByFour: List<List<IndexedValue<String>>>): List<
 private fun optimizeJsrRts(linesByFour: List<List<IndexedValue<String>>>): List<Modification> {
    // jsr Sub + rts -> jmp Sub
    val mods = mutableListOf<Modification>()
-    for (pair in linesByFour) {
-        val first = pair[0].value
-        val second = pair[1].value
+    for (lines in linesByFour) {
+        val first = lines[0].value
+        val second = lines[1].value
        if ((" jsr" in first || "\tjsr" in first ) && (" rts" in second || "\trts" in second)) {
-            mods += Modification(pair[0].index, false, pair[0].value.replace("jsr", "jmp"))
-            mods += Modification(pair[1].index, true, null)
+            mods += Modification(lines[0].index, false, lines[0].value.replace("jsr", "jmp"))
+            mods += Modification(lines[1].index, true, null)
        }
    }
    return mods
@@ -46,7 +46,9 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
            "sum" -> funcSum(fcall, resultToStack, resultRegister, sscope)
            "any", "all" -> funcAnyAll(fcall, func, resultToStack, resultRegister, sscope)
            "sin8", "sin8u", "sin16", "sin16u",
-            "cos8", "cos8u", "cos16", "cos16u" -> funcSinCosInt(fcall, func, resultToStack, resultRegister, sscope)
+            "sinr8", "sinr8u", "sinr16", "sinr16u",
+            "cos8", "cos8u", "cos16", "cos16u",
+            "cosr8", "cosr8u", "cosr16", "cosr16u" -> funcSinCosInt(fcall, func, resultToStack, resultRegister, sscope)
            "sgn" -> funcSgn(fcall, func, resultToStack, resultRegister, sscope)
            "sin", "cos", "tan", "atan",
            "ln", "log2", "sqrt", "rad",
@@ -283,11 +285,11 @@ internal class BuiltinFunctionsAsmGen(private val program: Program, private val
            asmgen.out("  jsr  prog8_lib.func_${func.name}_stack")
        else
            when(func.name) {
-                "sin8", "sin8u", "cos8", "cos8u" -> {
+                "sin8", "sin8u", "sinr8", "sinr8u", "cos8", "cos8u", "cosr8", "cosr8u" -> {
                    asmgen.out("  jsr  prog8_lib.func_${func.name}_into_A")
                    assignAsmGen.assignRegisterByte(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.A, false, scope, program, asmgen), CpuRegister.A)
                }
-                "sin16", "sin16u", "cos16", "cos16u" -> {
+                "sin16", "sin16u", "sinr16", "sinr16u", "cos16", "cos16u", "cosr16", "cosr16u" -> {
                    asmgen.out("  jsr  prog8_lib.func_${func.name}_into_AY")
                    assignAsmGen.assignRegisterpairWord(AsmAssignTarget.fromRegisters(resultRegister ?: RegisterOrPair.AY, false, scope, program, asmgen), RegisterOrPair.AY)
                }
@@ -209,7 +209,7 @@ internal class AsmAssignment(val source: AsmAssignSource,
        if(target.register !in arrayOf(RegisterOrPair.XY, RegisterOrPair.AX, RegisterOrPair.AY))
            require(source.datatype != DataType.UNDEFINED) { "must not be placeholder/undefined datatype" }
            require(memsizer.memorySize(source.datatype) <= memsizer.memorySize(target.datatype)) {
-                "source storage size must be less or equal to target datatype storage size"
+                "source dt size must be less or equal to target dt size at $position"
            }
    }
 }
@@ -7,17 +7,14 @@ import prog8.ast.statements.*
 import prog8.ast.toHex
 import prog8.compiler.target.AssemblyError
 import prog8.compiler.target.cpu6502.codegen.AsmGen
-import prog8.compiler.target.cpu6502.codegen.ExpressionsAsmGen
 import prog8.compilerinterface.BuiltinFunctions
 import prog8.compilerinterface.CpuType
 import prog8.compilerinterface.builtinFunctionReturnType


-internal class AssignmentAsmGen(private val program: Program, private val asmgen: AsmGen,
-                                private val exprAsmgen: ExpressionsAsmGen
-) {
+internal class AssignmentAsmGen(private val program: Program, private val asmgen: AsmGen) {

-    private val augmentableAsmGen = AugmentableAssignmentAsmGen(program, this, exprAsmgen, asmgen)
+    private val augmentableAsmGen = AugmentableAssignmentAsmGen(program, this, asmgen)

    fun translate(assignment: Assignment) {
        val target = AsmAssignTarget.fromAstAssignment(assignment, program, asmgen)
@@ -445,9 +442,35 @@ internal class AssignmentAsmGen(private val program: Program, private val asmgen
            }
        }

-        // No more special optmized cases yet. Do the rest via more complex evaluation
-        // note: cannot use assignTypeCastedValue because that is ourselves :P
-        asmgen.assignExpressionTo(origTypeCastExpression, target)
+        if(targetDt==DataType.FLOAT && (target.register==RegisterOrPair.FAC1 || target.register==RegisterOrPair.FAC2)) {
+            when(valueDt) {
+                DataType.UBYTE -> {
+                    assignExpressionToRegister(value, RegisterOrPair.Y, false)
+                    asmgen.out("  jsr  floats.FREADUY")
+                }
+                DataType.BYTE -> {
+                    assignExpressionToRegister(value, RegisterOrPair.A, true)
+                    asmgen.out("  jsr  floats.FREADSA")
+                }
+                DataType.UWORD -> {
+                    assignExpressionToRegister(value, RegisterOrPair.AY, false)
+                    asmgen.out("  jsr  floats.GIVUAYFAY")
+                }
+                DataType.WORD -> {
+                    assignExpressionToRegister(value, RegisterOrPair.AY, true)
+                    asmgen.out("  jsr  floats.GIVAYFAY")
+                }
+                else -> throw AssemblyError("invalid dt")
+            }
+            if(target.register==RegisterOrPair.FAC2) {
+                asmgen.out("  jsr floats.MOVEF")
+            }
+        } else {
+            // No more special optmized cases yet. Do the rest via more complex evaluation
+            // note: cannot use assignTypeCastedValue because that is ourselves :P
+            // NOTE: THIS MAY TURN INTO A STACK OVERFLOW ERROR IF IT CAN'T SIMPLIFY THE TYPECAST..... :-/
+            asmgen.assignExpressionTo(origTypeCastExpression, target)
+        }
    }

    private fun assignCastViaLsbFunc(value: Expression, target: AsmAssignTarget) {
@@ -7,12 +7,10 @@ import prog8.ast.statements.Subroutine
 import prog8.ast.toHex
 import prog8.compiler.target.AssemblyError
 import prog8.compiler.target.cpu6502.codegen.AsmGen
-import prog8.compiler.target.cpu6502.codegen.ExpressionsAsmGen
 import prog8.compilerinterface.CpuType

 internal class AugmentableAssignmentAsmGen(private val program: Program,
                                           private val assignmentAsmGen: AssignmentAsmGen,
-                                           private val exprAsmGen: ExpressionsAsmGen,
                                           private val asmgen: AsmGen
 ) {
    fun translate(assign: AsmAssignment) {
@@ -105,7 +103,21 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
        throw FatalAstException("assignment should be augmentable $binExpr")
    }

-    private fun inplaceModification(target: AsmAssignTarget, operator: String, value: Expression) {
+    private fun inplaceModification(target: AsmAssignTarget, operator: String, origValue: Expression) {
+
+
+        // the asm-gen code can deal with situations where you want to assign a byte into a word.
+        // it will create the most optimized code to do this (so it type-extends for us).
+        // But we can't deal with writing a word into a byte - explicit typeconversion is required
+        val value = if(program.memsizer.memorySize(origValue.inferType(program).getOr(DataType.UNDEFINED)) > program.memsizer.memorySize(target.datatype)) {
+            val typecast = TypecastExpression(origValue, target.datatype, true, origValue.position)
+            typecast.linkParents(origValue.parent)
+            typecast
+        }
+        else {
+            origValue
+        }
+
        val valueLv = (value as? NumericLiteralValue)?.number
        val ident = value as? IdentifierReference
        val memread = value as? DirectMemoryRead
@@ -657,14 +669,14 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
    private fun inplaceModification_byte_memread_to_variable(name: String, dt: DataType, operator: String, memread: DirectMemoryRead) {
        when (operator) {
            "+" -> {
-                exprAsmGen.translateDirectMemReadExpression(memread, false)
+                asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                asmgen.out("""
                    clc
                    adc  $name
                    sta  $name""")
            }
            "-" -> {
-                exprAsmGen.translateDirectMemReadExpression(memread, false)
+                asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                asmgen.out("""
                    sta  P8ZP_SCRATCH_B1
                    lda  $name
@@ -673,15 +685,15 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                    sta  $name""")
            }
            "|", "or" -> {
-                exprAsmGen.translateDirectMemReadExpression(memread, false)
+                asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                asmgen.out("  ora  $name  |  sta  $name")
            }
            "&", "and" -> {
-                exprAsmGen.translateDirectMemReadExpression(memread, false)
+                asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                asmgen.out("  and  $name  |  sta  $name")
            }
            "^", "xor" -> {
-                exprAsmGen.translateDirectMemReadExpression(memread, false)
+                asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                asmgen.out("  eor  $name  |  sta  $name")
            }
            // TODO: tuned code for more operators
@@ -694,7 +706,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
    private fun inplaceModification_word_memread_to_variable(name: String, dt: DataType, operator: String, memread: DirectMemoryRead) {
        when (operator) {
            "+" -> {
-                exprAsmGen.translateDirectMemReadExpression(memread, false)
+                asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                asmgen.out("""
                    clc
                    adc  $name
@@ -704,7 +716,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
 +""")
            }
            "-" -> {
-                exprAsmGen.translateDirectMemReadExpression(memread, false)
+                asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                asmgen.out("""
                    sta  P8ZP_SCRATCH_B1
                    lda  $name
@@ -716,11 +728,11 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
 +""")
            }
            "|", "or" -> {
-                exprAsmGen.translateDirectMemReadExpression(memread, false)
+                asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                asmgen.out("  ora  $name  |  sta  $name")
            }
            "&", "and" -> {
-                exprAsmGen.translateDirectMemReadExpression(memread, false)
+                asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                asmgen.out("  and  $name  |  sta  $name")
                if(dt in WordDatatypes) {
                    if(asmgen.isTargetCpu(CpuType.CPU65c02))
@@ -730,7 +742,7 @@ internal class AugmentableAssignmentAsmGen(private val program: Program,
                }
            }
            "^", "xor" -> {
-                exprAsmGen.translateDirectMemReadExpression(memread, false)
+                asmgen.translateDirectMemReadExpressionToRegAorStack(memread, false)
                asmgen.out("  eor  $name  |  sta  $name")
            }
            // TODO: tuned code for more operators
@@ -1,15 +1,11 @@
 package prog8tests.asmgen

-import org.hamcrest.MatcherAssert.assertThat
-import org.hamcrest.Matchers.equalTo
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.StringSpec
+import io.kotest.matchers.shouldBe
 import prog8.ast.Module
 import prog8.ast.Program
-import prog8.ast.base.DataType
-import prog8.ast.base.Position
-import prog8.ast.base.RegisterOrPair
-import prog8.ast.base.VarDeclType
+import prog8.ast.base.*
 import prog8.ast.expressions.AddressOf
 import prog8.ast.expressions.IdentifierReference
 import prog8.ast.expressions.NumericLiteralValue
@@ -25,22 +21,19 @@ import prog8tests.asmgen.helpers.DummyStringEncoder
 import prog8tests.asmgen.helpers.ErrorReporterForTests
 import java.nio.file.Path

-
-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestAsmGen6502 {
-
-    private fun createTestProgram(): Program {
+class AsmGenSymbolsTests: StringSpec({
+    fun createTestProgram(): Program {
        /*
-main  {
+    main  {

-label_outside:
+    label_outside:
    uword var_outside

    sub start () {
        uword localvar = 1234
        uword tgt

-locallabel:
+    locallabel:
        tgt = localvar
        tgt = &locallabel
        tgt = &var_outside
@@ -50,7 +43,7 @@ locallabel:
        tgt = &main.var_outside
        tgt = &main.label_outside
    }
-}
+    }

         */
        val varInSub = VarDecl(VarDeclType.VAR, DataType.UWORD, ZeropageWish.DONTCARE, null, "localvar", NumericLiteralValue.optimalInteger(1234, Position.DUMMY), false, false, false, Position.DUMMY)
@@ -80,7 +73,7 @@ locallabel:
        return program
    }

-    private fun createTestAsmGen(program: Program): AsmGen {
+    fun createTestAsmGen(program: Program): AsmGen {
        val errors = ErrorReporterForTests()
        val options = CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, true, C64Target)
        val zp = C64MachineDefinition.C64Zeropage(options)
@@ -88,64 +81,93 @@ locallabel:
        return asmgen
    }

-    @Test
-    fun testSymbolNameFromStrings() {
+    "symbol and variable names from strings" {
        val program = createTestProgram()
        val asmgen = createTestAsmGen(program)
-
-        assertThat(asmgen.asmSymbolName("name"), equalTo("name"))
-        assertThat(asmgen.asmSymbolName("<name>"), equalTo("prog8_name"))
-        assertThat(asmgen.asmSymbolName(RegisterOrPair.R15), equalTo("cx16.r15"))
-        assertThat(asmgen.asmSymbolName(listOf("a", "b", "name")), equalTo("a.b.name"))
-        assertThat(asmgen.asmVariableName("name"), equalTo("name"))
-        assertThat(asmgen.asmVariableName("<name>"), equalTo("prog8_name"))
-        assertThat(asmgen.asmVariableName(listOf("a", "b", "name")), equalTo("a.b.name"))
+        asmgen.asmSymbolName("name") shouldBe "name"
+        asmgen.asmSymbolName("name") shouldBe "name"
+        asmgen.asmSymbolName("<name>") shouldBe "prog8_name"
+        asmgen.asmSymbolName(RegisterOrPair.R15) shouldBe "cx16.r15"
+        asmgen.asmSymbolName(listOf("a", "b", "name")) shouldBe "a.b.name"
+        asmgen.asmVariableName("name") shouldBe "name"
+        asmgen.asmVariableName("<name>") shouldBe "prog8_name"
+        asmgen.asmVariableName(listOf("a", "b", "name")) shouldBe "a.b.name"
    }

-    @Test
-    fun testSymbolNameFromVarIdentifier() {
+    "symbol and variable names from variable identifiers" {
        val program = createTestProgram()
        val asmgen = createTestAsmGen(program)
        val sub = program.entrypoint

        // local variable
        val localvarIdent = sub.statements.filterIsInstance<Assignment>().first { it.value is IdentifierReference }.value as IdentifierReference
-        assertThat(asmgen.asmSymbolName(localvarIdent), equalTo("localvar"))
-        assertThat(asmgen.asmVariableName(localvarIdent), equalTo("localvar"))
+        asmgen.asmSymbolName(localvarIdent) shouldBe "localvar"
+        asmgen.asmVariableName(localvarIdent) shouldBe "localvar"
        val localvarIdentScoped = (sub.statements.filterIsInstance<Assignment>().first { (it.value as? AddressOf)?.identifier?.nameInSource==listOf("main", "start", "localvar") }.value as AddressOf).identifier
-        assertThat(asmgen.asmSymbolName(localvarIdentScoped), equalTo("main.start.localvar"))
-        assertThat(asmgen.asmVariableName(localvarIdentScoped), equalTo("main.start.localvar"))
+        asmgen.asmSymbolName(localvarIdentScoped) shouldBe "main.start.localvar"
+        asmgen.asmVariableName(localvarIdentScoped) shouldBe "main.start.localvar"

        // variable from outer scope (note that for Variables, no scoping prefix symbols are required,
        //   because they're not outputted as locally scoped symbols for the assembler
        val scopedVarIdent = (sub.statements.filterIsInstance<Assignment>().first { (it.value as? AddressOf)?.identifier?.nameInSource==listOf("var_outside") }.value as AddressOf).identifier
-        assertThat(asmgen.asmSymbolName(scopedVarIdent), equalTo("main.var_outside"))
-        assertThat(asmgen.asmVariableName(scopedVarIdent), equalTo("var_outside"))
+        asmgen.asmSymbolName(scopedVarIdent) shouldBe "main.var_outside"
+        asmgen.asmVariableName(scopedVarIdent) shouldBe "var_outside"
        val scopedVarIdentScoped = (sub.statements.filterIsInstance<Assignment>().first { (it.value as? AddressOf)?.identifier?.nameInSource==listOf("main", "var_outside") }.value as AddressOf).identifier
-        assertThat(asmgen.asmSymbolName(scopedVarIdentScoped), equalTo("main.var_outside"))
-        assertThat(asmgen.asmVariableName(scopedVarIdentScoped), equalTo("main.var_outside"))
+        asmgen.asmSymbolName(scopedVarIdentScoped) shouldBe "main.var_outside"
+        asmgen.asmVariableName(scopedVarIdentScoped) shouldBe "main.var_outside"
    }

-    @Test
-    fun testSymbolNameFromLabelIdentifier() {
+    "symbol and variable names from label identifiers" {
        val program = createTestProgram()
        val asmgen = createTestAsmGen(program)
        val sub = program.entrypoint

        // local label
        val localLabelIdent = (sub.statements.filterIsInstance<Assignment>().first { (it.value as? AddressOf)?.identifier?.nameInSource==listOf("locallabel") }.value as AddressOf).identifier
-        assertThat(asmgen.asmSymbolName(localLabelIdent), equalTo("_locallabel"))
-        assertThat("as a variable it uses different naming rules (no underscore prefix)", asmgen.asmVariableName(localLabelIdent), equalTo("locallabel"))
+        asmgen.asmSymbolName(localLabelIdent) shouldBe "_locallabel"
+        withClue("as a variable it uses different naming rules (no underscore prefix)") {
+            asmgen.asmVariableName(localLabelIdent) shouldBe "locallabel"
+        }
        val localLabelIdentScoped = (sub.statements.filterIsInstance<Assignment>().first { (it.value as? AddressOf)?.identifier?.nameInSource==listOf("main","start","locallabel") }.value as AddressOf).identifier
-        assertThat(asmgen.asmSymbolName(localLabelIdentScoped), equalTo("main.start._locallabel"))
-        assertThat("as a variable it uses different naming rules (no underscore prefix)", asmgen.asmVariableName(localLabelIdentScoped), equalTo("main.start.locallabel"))
+        asmgen.asmSymbolName(localLabelIdentScoped) shouldBe "main.start._locallabel"
+        withClue("as a variable it uses different naming rules (no underscore prefix)") {
+            asmgen.asmVariableName(localLabelIdentScoped) shouldBe "main.start.locallabel"
+        }

        // label from outer scope needs sope prefixes because it is outputted as a locally scoped symbol for the assembler
        val scopedLabelIdent = (sub.statements.filterIsInstance<Assignment>().first { (it.value as? AddressOf)?.identifier?.nameInSource==listOf("label_outside") }.value as AddressOf).identifier
-        assertThat(asmgen.asmSymbolName(scopedLabelIdent), equalTo("main._label_outside"))
-        assertThat("as a variable it uses different naming rules (no underscore prefix)", asmgen.asmVariableName(scopedLabelIdent), equalTo("label_outside"))
+        asmgen.asmSymbolName(scopedLabelIdent) shouldBe "main._label_outside"
+        withClue("as a variable it uses different naming rules (no underscore prefix)") {
+            asmgen.asmVariableName(scopedLabelIdent) shouldBe "label_outside"
+        }
        val scopedLabelIdentScoped = (sub.statements.filterIsInstance<Assignment>().first { (it.value as? AddressOf)?.identifier?.nameInSource==listOf("main","label_outside") }.value as AddressOf).identifier
-        assertThat(asmgen.asmSymbolName(scopedLabelIdentScoped), equalTo("main._label_outside"))
-        assertThat("as a variable it uses different naming rules (no underscore prefix)", asmgen.asmVariableName(scopedLabelIdentScoped), equalTo("main.label_outside"))
+        asmgen.asmSymbolName(scopedLabelIdentScoped) shouldBe "main._label_outside"
+        withClue("as a variable it uses different naming rules (no underscore prefix)") {
+            asmgen.asmVariableName(scopedLabelIdentScoped) shouldBe "main.label_outside"
+        }
    }
-}
+
+    "asm names for hooks to zp temp vars" {
+        /*
+main {
+
+    sub start() {
+        prog8_lib.P8ZP_SCRATCH_REG = 1
+        prog8_lib.P8ZP_SCRATCH_B1 = 1
+        prog8_lib.P8ZP_SCRATCH_W1 = 1
+        prog8_lib.P8ZP_SCRATCH_W2 = 1
+         */
+        val program = createTestProgram()
+        val asmgen = createTestAsmGen(program)
+        asmgen.asmSymbolName("prog8_lib.P8ZP_SCRATCH_REG") shouldBe "P8ZP_SCRATCH_REG"
+        asmgen.asmSymbolName("prog8_lib.P8ZP_SCRATCH_W2") shouldBe "P8ZP_SCRATCH_W2"
+        asmgen.asmSymbolName(listOf("prog8_lib","P8ZP_SCRATCH_REG")) shouldBe "P8ZP_SCRATCH_REG"
+        asmgen.asmSymbolName(listOf("prog8_lib","P8ZP_SCRATCH_W2")) shouldBe "P8ZP_SCRATCH_W2"
+        val id1 = IdentifierReference(listOf("prog8_lib","P8ZP_SCRATCH_REG"), Position.DUMMY)
+        id1.linkParents(program.toplevelModule)
+        val id2 = IdentifierReference(listOf("prog8_lib","P8ZP_SCRATCH_W2"), Position.DUMMY)
+        id2.linkParents(program.toplevelModule)
+        asmgen.asmSymbolName(id1) shouldBe "P8ZP_SCRATCH_REG"
+        asmgen.asmSymbolName(id2) shouldBe "P8ZP_SCRATCH_W2"
+    }
+})
@@ -0,0 +1,8 @@
+package prog8tests.asmgen
+
+import io.kotest.core.config.AbstractProjectConfig
+import kotlin.math.max
+
+object ProjectConfig : AbstractProjectConfig() {
+    override val parallelism = max(2, Runtime.getRuntime().availableProcessors() / 2)
+}
@@ -16,12 +16,6 @@ dependencies {
    implementation project(':compilerAst')
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
    // implementation "org.jetbrains.kotlin:kotlin-reflect"
-
-    testImplementation "org.jetbrains.kotlin:kotlin-test-junit5"
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.2'
-    testImplementation 'org.hamcrest:hamcrest:2.2'
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.2'
-
 }

 sourceSets {
@@ -33,22 +27,6 @@ sourceSets {
            srcDirs = ["${project.projectDir}/res"]
        }
    }
-    test {
-        java {
-            srcDirs = ["${project.projectDir}/test"]
-        }
-    }
 }

-test {
-    // Enable JUnit 5 (Gradle 4.6+).
-    useJUnitPlatform()
-
-    // Always run tests, even when nothing changed.
-    dependsOn 'cleanTest'
-
-    // Show test results.
-    testLogging {
-        events "skipped", "failed"
-    }
-}
+// note: there are no unit tests in this module!
@@ -12,7 +12,5 @@
    <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
    <orderEntry type="module" module-name="compilerInterfaces" />
    <orderEntry type="module" module-name="compilerAst" />
-    <orderEntry type="library" scope="TEST" name="hamcrest" level="project" />
-    <orderEntry type="library" name="junit.jupiter" level="project" />
  </component>
 </module>
@@ -1,2 +1,2 @@
 Unittests for things in this module are located in the Compiler module instead,
-for convenience sake - and to not spread the test cases around too much.
+for convenience sake, and to not spread the test cases around too much.
@@ -4,7 +4,10 @@ import prog8.ast.IStatementContainer
 import prog8.ast.Node
 import prog8.ast.Program
 import prog8.ast.base.DataType
+import prog8.ast.base.FatalAstException
 import prog8.ast.expressions.BinaryExpression
+import prog8.ast.expressions.IdentifierReference
+import prog8.ast.expressions.TypecastExpression
 import prog8.ast.expressions.augmentAssignmentOperators
 import prog8.ast.statements.AssignTarget
 import prog8.ast.statements.Assignment
@@ -17,34 +20,14 @@ import prog8.compilerinterface.isInRegularRAMof

 class BinExprSplitter(private val program: Program, private val options: CompilationOptions, private val compTarget: ICompilationTarget) : AstWalker() {

-//    override fun after(decl: VarDecl, parent: Node): Iterable<IAstModification> {
-// TODO somehow if we do this, the resulting code for some programs (cube3d.p8) gets hundreds of bytes larger...: [ IS THIS STILL TRUE AFTER ALL CHANGES? ]
-//        if(decl.type==VarDeclType.VAR ) {
-//            val binExpr = decl.value as? BinaryExpression
-//            if (binExpr != null && binExpr.operator in augmentAssignmentOperators) {
-//                // split into a vardecl with just the left expression, and an aug. assignment with the right expression.
-//                val augExpr = BinaryExpression(IdentifierReference(listOf(decl.name), decl.position), binExpr.operator, binExpr.right, binExpr.position)
-//                val target = AssignTarget(IdentifierReference(listOf(decl.name), decl.position), null, null, decl.position)
-//                val assign = Assignment(target, augExpr, binExpr.position)
-//                println("SPLIT VARDECL $decl")
-//                return listOf(
-//                        IAstModification.SetExpression({ decl.value = it }, binExpr.left, decl),
-//                        IAstModification.InsertAfter(decl, assign, parent)
-//                )
-//            }
-//        }
-//        return noModifications
-//    }
-
    override fun after(assignment: Assignment, parent: Node): Iterable<IAstModification> {

+        if(assignment.value.inferType(program).istype(DataType.FLOAT) && !options.optimizeFloatExpressions)
+            return noModifications
+
        val binExpr = assignment.value as? BinaryExpression
        if (binExpr != null) {

-            if(binExpr.inferType(program).istype(DataType.FLOAT) && !options.optimizeFloatExpressions)
-                return noModifications
-
-
 /*

 Reduce the complexity of a (binary) expression that has to be evaluated on the eval stack,
@@ -78,10 +61,38 @@ X =      BinExpr                                    X   =   LeftExpr
            }

            // TODO further unraveling of binary expression trees into flat statements.
-            // however this should probably be done in a more generic way to also service
+            // however this should probably be done in a more generic way to also work on
            // the expressiontrees that are not used in an assignment statement...
        }

+        val typecast = assignment.value as? TypecastExpression
+        if(typecast!=null) {
+            val origExpr = typecast.expression as? BinaryExpression
+            if(origExpr!=null) {
+                // it's a typecast of a binary expression.
+                // we can see if we can unwrap the binary expression by working on a new temporary variable
+                // (that has the type of the expression), and then finally doing the typecast.
+                // Once it's outside the typecast, the regular splitting can commence.
+                val tempDt = origExpr.inferType(program).getOr(DataType.UNDEFINED)
+                val tempVar = when(tempDt) {
+                    DataType.UBYTE -> listOf("prog8_lib", "retval_interm_ub")
+                    DataType.BYTE -> listOf("prog8_lib", "retval_interm_b")
+                    DataType.UWORD -> listOf("prog8_lib", "retval_interm_uw")
+                    DataType.WORD -> listOf("prog8_lib", "retval_interm_w")
+                    DataType.FLOAT -> listOf("floats", "tempvar_swap_float")
+                    else -> throw FatalAstException("invalid dt $tempDt")
+                }
+                val assignTempVar = Assignment(
+                    AssignTarget(IdentifierReference(tempVar, typecast.position), null, null, typecast.position),
+                    typecast.expression, typecast.position
+                )
+                return listOf(
+                    IAstModification.InsertBefore(assignment, assignTempVar, parent as IStatementContainer),
+                    IAstModification.ReplaceNode(typecast.expression, IdentifierReference(tempVar, typecast.position), typecast)
+                )
+            }
+        }
+
        return noModifications
    }

@@ -15,8 +15,6 @@ import prog8.compilerinterface.IErrorReporter
 import prog8.compilerinterface.size
 import kotlin.math.floor

-internal const val retvarName = "prog8_retval"
-

 class StatementOptimizer(private val program: Program,
                                  private val errors: IErrorReporter,
@@ -24,23 +22,6 @@ class StatementOptimizer(private val program: Program,
                                  private val compTarget: ICompilationTarget
 ) : AstWalker() {

-    private val subsThatNeedReturnVariable = mutableSetOf<Triple<IStatementContainer, DataType, Position>>()
-
-
-    override fun after(subroutine: Subroutine, parent: Node): Iterable<IAstModification> {
-        for(returnvar in subsThatNeedReturnVariable) {
-            val decl = VarDecl(VarDeclType.VAR, returnvar.second, ZeropageWish.DONTCARE, null, retvarName, null,
-                isArray = false,
-                autogeneratedDontRemove = true,
-                sharedWithAsm = false,
-                position = returnvar.third
-            )
-            returnvar.first.statements.add(0, decl)
-        }
-        subsThatNeedReturnVariable.clear()
-        return noModifications
-    }
-
    override fun before(functionCall: FunctionCall, parent: Node): Iterable<IAstModification> {
        // if the first instruction in the called subroutine is a return statement with a simple value,
        // remove the jump altogeter and inline the returnvalue directly.
@@ -439,12 +420,17 @@ class StatementOptimizer(private val program: Program,
            val returnDt = subr.returntypes.single()
            if (returnDt in IntegerDatatypes) {
                // first assign to intermediary variable, then return that
-                subsThatNeedReturnVariable.add(Triple(subr, returnDt, returnStmt.position))
-                val returnValueIntermediary1 = IdentifierReference(listOf(retvarName), returnStmt.position)
-                val returnValueIntermediary2 = IdentifierReference(listOf(retvarName), returnStmt.position)
-                val tgt = AssignTarget(returnValueIntermediary1, null, null, returnStmt.position)
+                val returnVarName = "retval_interm_" + when(returnDt) {
+                    DataType.UBYTE -> "ub"
+                    DataType.BYTE -> "b"
+                    DataType.UWORD -> "uw"
+                    DataType.WORD -> "w"
+                    else -> "<undefined>"
+                }
+                val returnValueIntermediary = IdentifierReference(listOf("prog8_lib", returnVarName), returnStmt.position)
+                val tgt = AssignTarget(returnValueIntermediary, null, null, returnStmt.position)
                val assign = Assignment(tgt, value, returnStmt.position)
-                val returnReplacement = Return(returnValueIntermediary2, returnStmt.position)
+                val returnReplacement = Return(returnValueIntermediary.copy(), returnStmt.position)
                return listOf(
                    IAstModification.InsertBefore(returnStmt, assign, parent as IStatementContainer),
                    IAstModification.ReplaceNode(returnStmt, returnReplacement, parent)
@@ -107,9 +107,32 @@ class UnusedCodeRemover(private val program: Program,
        if(decl.type==VarDeclType.VAR) {
            val forceOutput = "force_output" in decl.definingBlock.options()
            if (!forceOutput && !decl.autogeneratedDontRemove && !decl.sharedWithAsm && !decl.definingBlock.isInLibrary) {
-                if (callgraph.unused(decl)) {
+                val usages = callgraph.usages(decl)
+                if (usages.isEmpty()) {
                    errors.warn("removing unused variable '${decl.name}'", decl.position)
                    return listOf(IAstModification.Remove(decl, parent as IStatementContainer))
+                } else {
+                    // if all usages are just an assignment to this vardecl
+                    // and it is in regular RAM, then remove the var as well including all assignments
+                    val assignTargets = usages.mapNotNull {
+                        if(it.parent is AssignTarget)
+                                it.parent as AssignTarget
+                        else if(it.parent.parent is AssignTarget)
+                                it.parent.parent as AssignTarget
+                        else null
+                    }.filter {
+                        it.isInRegularRAMof(compTarget.machine)
+                    }
+                    if(assignTargets.size==usages.size) {
+                        // TODO FIX THAT A MEMREAD OF THE VARIABLE ISN'T RECOGNISED AS A USE (imageviewer iff_module.p8 pixptr)
+                        errors.warn("removing unused variable '${decl.name}'", decl.position)
+                        val assignmentsToRemove = assignTargets.map { it.parent to it.parent.parent as IStatementContainer}.toSet()
+                        return assignmentsToRemove.map {
+                            IAstModification.Remove(it.first, it.second)
+                        } + listOf(
+                            IAstModification.Remove(decl, parent as IStatementContainer)
+                        )
+                    }
                }
            }
        }
@@ -3,6 +3,7 @@ plugins {
    id 'application'
    id "org.jetbrains.kotlin.jvm"
    id 'com.github.johnrengelman.shadow' version '7.1.0'
+    id "io.kotest" version "0.3.8"
 }

 java {
@@ -23,10 +24,7 @@ dependencies {
    implementation 'org.jetbrains.kotlinx:kotlinx-cli:0.3.3'
    implementation "com.michael-bull.kotlin-result:kotlin-result-jvm:1.1.12"

-    testImplementation "org.jetbrains.kotlin:kotlin-test-junit5"
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.2'
-    testImplementation 'org.hamcrest:hamcrest:2.2'
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.2'
+    testImplementation 'io.kotest:kotest-runner-junit5-jvm:4.6.3'
 }

 configurations.all {
@@ -1,10 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module type="JAVA_MODULE" version="4">
-  <component name="FacetManager">
-    <facet type="Python" name="Python">
-      <configuration sdkName="Python 3.9" />
-    </facet>
-  </component>
  <component name="NewModuleRootManager" inherit-compiler-output="true">
    <exclude-output />
    <content url="file://$MODULE_DIR$">
@@ -17,13 +12,12 @@
    <orderEntry type="sourceFolder" forTests="false" />
    <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
    <orderEntry type="module" module-name="compilerAst" />
-    <orderEntry type="library" name="Python 3.9 interpreter library" level="application" />
-    <orderEntry type="library" name="hamcrest" level="project" />
    <orderEntry type="library" name="jetbrains.kotlinx.cli.jvm" level="project" />
-    <orderEntry type="library" name="junit.jupiter" level="project" />
    <orderEntry type="library" name="michael.bull.kotlin.result.jvm" level="project" />
    <orderEntry type="module" module-name="codeOptimizers" />
    <orderEntry type="module" module-name="compilerInterfaces" />
    <orderEntry type="module" module-name="codeGeneration" />
+    <orderEntry type="library" name="io.kotest.assertions.core.jvm" level="project" />
+    <orderEntry type="library" name="io.kotest.runner.junit5.jvm" level="project" />
  </component>
 </module>
@@ -12,7 +12,7 @@ floats {
        const float  PI     = 3.141592653589793
        const float  TWOPI  = 6.283185307179586

-        ubyte[5] tempvar_swap_float     ; used for some swap() operations
+        float  tempvar_swap_float     ; used for some swap() operations

 ; ---- C64 basic and kernal ROM float constants and functions ----

@@ -699,6 +699,23 @@ cx16 {
    &uword r14 = $cf1c
    &uword r15 = $cf1e

+    &word r0s  = $cf00
+    &word r1s  = $cf02
+    &word r2s  = $cf04
+    &word r3s  = $cf06
+    &word r4s  = $cf08
+    &word r5s  = $cf0a
+    &word r6s  = $cf0c
+    &word r7s  = $cf0e
+    &word r8s  = $cf10
+    &word r9s  = $cf12
+    &word r10s = $cf14
+    &word r11s = $cf16
+    &word r12s = $cf18
+    &word r13s = $cf1a
+    &word r14s = $cf1c
+    &word r15s = $cf1e
+
    &ubyte r0L  = $cf00
    &ubyte r1L  = $cf02
    &ubyte r2L  = $cf04
@@ -732,4 +749,38 @@ cx16 {
    &ubyte r13H = $cf1b
    &ubyte r14H = $cf1d
    &ubyte r15H = $cf1f
+
+    &byte r0sL  = $cf00
+    &byte r1sL  = $cf02
+    &byte r2sL  = $cf04
+    &byte r3sL  = $cf06
+    &byte r4sL  = $cf08
+    &byte r5sL  = $cf0a
+    &byte r6sL  = $cf0c
+    &byte r7sL  = $cf0e
+    &byte r8sL  = $cf10
+    &byte r9sL  = $cf12
+    &byte r10sL = $cf14
+    &byte r11sL = $cf16
+    &byte r12sL = $cf18
+    &byte r13sL = $cf1a
+    &byte r14sL = $cf1c
+    &byte r15sL = $cf1e
+
+    &byte r0sH  = $cf01
+    &byte r1sH  = $cf03
+    &byte r2sH  = $cf05
+    &byte r3sH  = $cf07
+    &byte r4sH  = $cf09
+    &byte r5sH  = $cf0b
+    &byte r6sH  = $cf0d
+    &byte r7sH  = $cf0f
+    &byte r8sH  = $cf11
+    &byte r9sH  = $cf13
+    &byte r10sH = $cf15
+    &byte r11sH = $cf17
+    &byte r12sH = $cf19
+    &byte r13sH = $cf1b
+    &byte r14sH = $cf1d
+    &byte r15sH = $cf1f
 }
@@ -13,7 +13,7 @@ floats {
        const float  PI     = 3.141592653589793
        const float  TWOPI  = 6.283185307179586

-        ubyte[5] tempvar_swap_float     ; used for some swap() operations
+        float  tempvar_swap_float     ; used for some swap() operations


 ; ---- ROM float functions ----
@@ -95,7 +95,7 @@ cx16 {
    &uword  IRQ_VEC         = $FFFE     ; 65c02 interrupt vector, determined by the kernal if banked in


-; the sixteen virtual 16-bit registers
+; the sixteen virtual 16-bit registers in both normal unsigned mode and signed mode (s)
    &uword r0  = $0002
    &uword r1  = $0004
    &uword r2  = $0006
@@ -113,6 +113,23 @@ cx16 {
    &uword r14 = $001e
    &uword r15 = $0020

+    &word r0s  = $0002
+    &word r1s  = $0004
+    &word r2s  = $0006
+    &word r3s  = $0008
+    &word r4s  = $000a
+    &word r5s  = $000c
+    &word r6s  = $000e
+    &word r7s  = $0010
+    &word r8s  = $0012
+    &word r9s  = $0014
+    &word r10s = $0016
+    &word r11s = $0018
+    &word r12s = $001a
+    &word r13s = $001c
+    &word r14s = $001e
+    &word r15s = $0020
+
    &ubyte r0L  = $0002
    &ubyte r1L  = $0004
    &ubyte r2L  = $0006
@@ -147,6 +164,39 @@ cx16 {
    &ubyte r14H = $001f
    &ubyte r15H = $0021

+    &byte r0sL  = $0002
+    &byte r1sL  = $0004
+    &byte r2sL  = $0006
+    &byte r3sL  = $0008
+    &byte r4sL  = $000a
+    &byte r5sL  = $000c
+    &byte r6sL  = $000e
+    &byte r7sL  = $0010
+    &byte r8sL  = $0012
+    &byte r9sL  = $0014
+    &byte r10sL = $0016
+    &byte r11sL = $0018
+    &byte r12sL = $001a
+    &byte r13sL = $001c
+    &byte r14sL = $001e
+    &byte r15sL = $0020
+
+    &byte r0sH  = $0003
+    &byte r1sH  = $0005
+    &byte r2sH  = $0007
+    &byte r3sH  = $0009
+    &byte r4sH  = $000b
+    &byte r5sH  = $000d
+    &byte r6sH  = $000f
+    &byte r7sH  = $0011
+    &byte r8sH  = $0013
+    &byte r9sH  = $0015
+    &byte r10sH = $0017
+    &byte r11sH = $0019
+    &byte r12sH = $001b
+    &byte r13sH = $001d
+    &byte r14sH = $001f
+    &byte r15sH = $0021

 ; VERA registers

@@ -91,6 +91,13 @@ func_sin8_into_A	.proc
 _sinecos8	.char  trunc(127.0 * sin(range(256+64) * rad(360.0/256.0)))
 		.pend

+func_sinr8_into_A	.proc
+		tay
+		lda  _sinecosR8,y
+		rts
+_sinecosR8	.char  trunc(127.0 * sin(range(180+45) * rad(360.0/180.0)))
+		.pend
+
 func_sin8u_into_A	.proc
 		tay
 		lda  _sinecos8u,y
@@ -98,6 +105,13 @@ func_sin8u_into_A	.proc
 _sinecos8u	.byte  trunc(128.0 + 127.5 * sin(range(256+64) * rad(360.0/256.0)))
 		.pend

+func_sinr8u_into_A	.proc
+		tay
+		lda  _sinecosR8u,y
+		rts
+_sinecosR8u	.byte  trunc(128.0 + 127.5 * sin(range(180+45) * rad(360.0/180.0)))
+		.pend
+
 func_sin8_stack	.proc
 		tay
 		lda  func_sin8_into_A._sinecos8,y
@@ -106,6 +120,14 @@ func_sin8_stack	.proc
 		rts
 		.pend

+func_sinr8_stack	.proc
+		tay
+		lda  func_sinr8_into_A._sinecosR8,y
+		sta  P8ESTACK_LO,x
+		dex
+		rts
+		.pend
+
 func_sin8u_stack	.proc
 		tay
 		lda  func_sin8u_into_A._sinecos8u,y
@@ -114,18 +136,38 @@ func_sin8u_stack	.proc
 		rts
 		.pend

+func_sinr8u_stack	.proc
+		tay
+		lda  func_sinr8u_into_A._sinecosR8u,y
+		sta  P8ESTACK_LO,x
+		dex
+		rts
+		.pend
+
 func_cos8_into_A	.proc
 		tay
 		lda  func_sin8_into_A._sinecos8+64,y
 		rts
 		.pend

+func_cosr8_into_A	.proc
+		tay
+		lda  func_sinr8_into_A._sinecosR8+45,y
+		rts
+		.pend
+
 func_cos8u_into_A	.proc
 		tay
 		lda  func_sin8u_into_A._sinecos8u+64,y
 		rts
 		.pend

+func_cosr8u_into_A	.proc
+		tay
+		lda  func_sinr8u_into_A._sinecosR8u+45,y
+		rts
+		.pend
+
 func_cos8_stack	.proc
 		tay
 		lda  func_sin8_into_A._sinecos8+64,y
@@ -134,6 +176,14 @@ func_cos8_stack	.proc
 		rts
 		.pend

+func_cosr8_stack	.proc
+		tay
+		lda  func_sinr8_into_A._sinecosR8+45,y
+		sta  P8ESTACK_LO,x
+		dex
+		rts
+		.pend
+
 func_cos8u_stack	.proc
 		tay
 		lda  func_sin8u_into_A._sinecos8u+64,y
@@ -142,6 +192,14 @@ func_cos8u_stack	.proc
 		rts
 		.pend

+func_cosr8u_stack	.proc
+		tay
+		lda  func_sinr8u_into_A._sinecosR8u+45,y
+		sta  P8ESTACK_LO,x
+		dex
+		rts
+		.pend
+
 func_sin16_into_AY	.proc
 		tay
 		lda  _sinecos8lo,y
@@ -155,6 +213,19 @@ _sinecos8lo     .byte  <_
 _sinecos8hi     .byte  >_
 		.pend

+func_sinr16_into_AY	.proc
+		tay
+		lda  _sinecosR8lo,y
+		pha
+		lda  _sinecosR8hi,y
+		tay
+		pla
+		rts
+_  :=  trunc(32767.0 * sin(range(180+45) * rad(360.0/180.0)))
+_sinecosR8lo     .byte  <_
+_sinecosR8hi     .byte  >_
+		.pend
+
 func_sin16u_into_AY	.proc
 		tay
 		lda  _sinecos8ulo,y
@@ -168,6 +239,18 @@ _sinecos8ulo     .byte  <_
 _sinecos8uhi     .byte  >_
 		.pend

+func_sinr16u_into_AY	.proc
+		tay
+		lda  _sinecosR8ulo,y
+		pha
+		lda  _sinecosR8uhi,y
+		tay
+		pla
+		rts
+_  :=  trunc(32768.0 + 32767.5 * sin(range(180+45) * rad(360.0/180.0)))
+_sinecosR8ulo     .byte  <_
+_sinecosR8uhi     .byte  >_
+		.pend

 func_sin16_stack	.proc
 		tay
@@ -179,6 +262,16 @@ func_sin16_stack	.proc
 		rts
 		.pend

+func_sinr16_stack	.proc
+		tay
+		lda  func_sinr16_into_AY._sinecosR8lo,y
+		sta  P8ESTACK_LO,x
+		lda  func_sinr16_into_AY._sinecosR8hi,y
+		sta  P8ESTACK_HI,x
+		dex
+		rts
+		.pend
+
 func_sin16u_stack	.proc
 		tay
 		lda  func_sin16u_into_AY._sinecos8ulo,y
@@ -189,6 +282,16 @@ func_sin16u_stack	.proc
 		rts
 		.pend

+func_sinr16u_stack	.proc
+		tay
+		lda  func_sinr16u_into_AY._sinecosR8ulo,y
+		sta  P8ESTACK_LO,x
+		lda  func_sinr16u_into_AY._sinecosR8uhi,y
+		sta  P8ESTACK_HI,x
+		dex
+		rts
+		.pend
+
 func_cos16_into_AY	.proc
 		tay
 		lda  func_sin16_into_AY._sinecos8lo+64,y
@@ -199,6 +302,16 @@ func_cos16_into_AY	.proc
 		rts
 		.pend

+func_cosr16_into_AY	.proc
+		tay
+		lda  func_sinr16_into_AY._sinecosR8lo+45,y
+		pha
+		lda  func_sinr16_into_AY._sinecosR8hi+45,y
+		tay
+		pla
+		rts
+		.pend
+
 func_cos16u_into_AY	.proc
 		tay
 		lda  func_sin16u_into_AY._sinecos8ulo+64,y
@@ -209,6 +322,16 @@ func_cos16u_into_AY	.proc
 		rts
 		.pend

+func_cosr16u_into_AY	.proc
+		tay
+		lda  func_sinr16u_into_AY._sinecosR8ulo+45,y
+		pha
+		lda  func_sinr16u_into_AY._sinecosR8uhi+45,y
+		tay
+		pla
+		rts
+		.pend
+
 func_cos16_stack	.proc
 		tay
 		lda  func_sin16_into_AY._sinecos8lo+64,y
@@ -219,6 +342,16 @@ func_cos16_stack	.proc
 		rts
 		.pend

+func_cosr16_stack	.proc
+		tay
+		lda  func_sinr16_into_AY._sinecosR8lo+45,y
+		sta  P8ESTACK_LO,x
+		lda  func_sinr16_into_AY._sinecosR8hi+45,y
+		sta  P8ESTACK_HI,x
+		dex
+		rts
+		.pend
+
 func_cos16u_stack	.proc
 		tay
 		lda  func_sin16u_into_AY._sinecos8ulo+64,y
@@ -229,6 +362,16 @@ func_cos16u_stack	.proc
 		rts
 		.pend

+func_cosr16u_stack	.proc
+		tay
+		lda  func_sinr16u_into_AY._sinecosR8ulo+45,y
+		sta  P8ESTACK_LO,x
+		lda  func_sinr16u_into_AY._sinecosR8uhi+45,y
+		sta  P8ESTACK_HI,x
+		dex
+		rts
+		.pend
+
 abs_b_stack	.proc
 	; -- push abs(A) on stack (as byte)
 		jsr  abs_b_into_A
@@ -6,12 +6,24 @@ prog8_lib {
 	%asminclude "library:prog8_lib.asm"
 	%asminclude "library:prog8_funcs.asm"

-        ; TODO these retval variables are no longer used???
-	uword @zp retval_interm_uw      ; to store intermediary expression results for return values (hopefully allocated on ZP to reduce code size)
-	word @zp retval_interm_w        ; to store intermediary expression results for return values (hopefully allocated on ZP to reduce code size)
-	ubyte @zp retval_interm_ub      ; to store intermediary expression results for return values (hopefully allocated on ZP to reduce code size)
-	byte @zp retval_interm_b        ; to store intermediary expression results for return values (hopefully allocated on ZP to reduce code size)
-	; NOTE: these variables are checked in the StatementReorderer (in fun after(decl: VarDecl)), for these exact names!
+	; to store intermediary expression results for return values:
+	; NOTE: these variables are used in the StatementReorderer and StatementOptimizer
+	uword @zp retval_interm_uw
+	word @zp retval_interm_w
+	ubyte @zp retval_interm_ub
+	byte @zp retval_interm_b
+	word retval_interm_w2
+	byte retval_interm_b2
+
+        ; prog8 "hooks" to be able to access the temporary scratch variables
+        ; YOU SHOULD NOT USE THESE IN USER CODE - THESE ARE MEANT FOR INTERNAL COMPILER USE
+        ; NOTE: the assembly code generator will match these names and not generate
+        ;       new variables/memdefs for them, rather, they'll point to the scratch variables directly.
+        &ubyte P8ZP_SCRATCH_REG = $ff
+        &byte P8ZP_SCRATCH_B1 = $ff
+        &uword P8ZP_SCRATCH_W1 = $ff
+        &word P8ZP_SCRATCH_W2 = $ff
+

 	asmsub pattern_match(str string @AY, str pattern @R0) clobbers(Y) -> ubyte @A {
 		%asm {{
@@ -1 +1 @@
-7.2
+7.3
@@ -11,6 +11,7 @@ import prog8.ast.walk.AstWalker
 import prog8.ast.walk.IAstModification
 import prog8.ast.walk.IAstVisitor
 import prog8.compiler.astprocessing.isSubroutineParameter
+import prog8.compiler.target.AssemblyError
 import prog8.compilerinterface.*


@@ -45,14 +46,18 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, private val o
                        if(binExpr.operator in associativeOperators) {
                            // A = <something-without-A>  <associativeoperator>  <otherthing-with-A>
                            // use the other part of the expression to split.
-                            val assignRight = Assignment(assignment.target, binExpr.right, assignment.position)
+                            val sourceDt = binExpr.right.inferType(program).getOrElse { throw AssemblyError("invalid dt") }
+                            val (_, right) = binExpr.right.typecastTo(assignment.target.inferType(program).getOr(DataType.UNDEFINED), sourceDt, implicit=true)
+                            val assignRight = Assignment(assignment.target, right, assignment.position)
                            return listOf(
                                    IAstModification.InsertBefore(assignment, assignRight, parent as IStatementContainer),
                                    IAstModification.ReplaceNode(binExpr.right, binExpr.left, binExpr),
                                    IAstModification.ReplaceNode(binExpr.left, assignment.target.toExpression(), binExpr))
                        }
                    } else {
-                        val assignLeft = Assignment(assignment.target, binExpr.left, assignment.position)
+                        val sourceDt = binExpr.left.inferType(program).getOrElse { throw AssemblyError("invalid dt") }
+                        val (_, left) = binExpr.left.typecastTo(assignment.target.inferType(program).getOr(DataType.UNDEFINED), sourceDt, implicit=true)
+                        val assignLeft = Assignment(assignment.target, left, assignment.position)
                        return listOf(
                                IAstModification.InsertBefore(assignment, assignLeft, parent as IStatementContainer),
                                IAstModification.ReplaceNode(binExpr.left, assignment.target.toExpression(), binExpr))
@@ -141,7 +146,7 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, private val o
    }

    override fun after(typecast: TypecastExpression, parent: Node): Iterable<IAstModification> {
-        // see if we can remove superfluous typecasts (outside of expressions)
+        // see if we can remove redundant typecasts (outside of expressions)
        // such as casting byte<->ubyte,  word<->uword
        // Also the special typecast of a reference type (str, array) to an UWORD will be changed into address-of,
        //   UNLESS it's a str parameter in the containing subroutine - then we remove the typecast altogether
@@ -201,12 +206,84 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, private val o
            return listOf(IAstModification.ReplaceNode(ifStatement.condition, booleanExpr, ifStatement))
        }

-        if((binExpr.operator=="==" || binExpr.operator=="!=") &&
-            (binExpr.left as? NumericLiteralValue)?.number==0 &&
+        if((binExpr.left as? NumericLiteralValue)?.number==0 &&
            (binExpr.right as? NumericLiteralValue)?.number!=0)
-            throw InternalCompilerException("if 0==X should have been swapped to if X==0")
+            throw FatalAstException("0==X should have been swapped to if X==0")

-        return noModifications
+        // simplify the conditional expression, introduce simple assignments if required.
+        // NOTE: sometimes this increases code size because additional stores/loads are generated for the
+        //       intermediate variables. We assume these are optimized away from the resulting assembly code later.
+        val simplify = simplifyConditionalExpression(binExpr)
+        val modifications = mutableListOf<IAstModification>()
+        if(simplify.rightVarAssignment!=null) {
+            modifications += IAstModification.ReplaceNode(binExpr.right, simplify.rightOperandReplacement!!, binExpr)
+            modifications += IAstModification.InsertBefore(ifStatement, simplify.rightVarAssignment, parent as IStatementContainer)
+        }
+        if(simplify.leftVarAssignment!=null) {
+            modifications += IAstModification.ReplaceNode(binExpr.left, simplify.leftOperandReplacement!!, binExpr)
+            modifications += IAstModification.InsertBefore(ifStatement, simplify.leftVarAssignment, parent as IStatementContainer)
+        }
+
+        return modifications
+    }
+
+    private class CondExprSimplificationResult(
+        val leftVarAssignment: Assignment?,
+        val leftOperandReplacement: Expression?,
+        val rightVarAssignment: Assignment?,
+        val rightOperandReplacement: Expression?
+    )
+
+    private fun simplifyConditionalExpression(expr: BinaryExpression): CondExprSimplificationResult {
+
+        // TODO: somehow figure out if the expr will result in stack-evaluation STILL after being split off,
+        //       in that case: do *not* split it off but just keep it as it is (otherwise code size increases)
+
+        var leftAssignment: Assignment? = null
+        var leftOperandReplacement: Expression? = null
+        var rightAssignment: Assignment? = null
+        var rightOperandReplacement: Expression? = null
+
+        val separateLeftExpr = !expr.left.isSimple && expr.left !is IFunctionCall
+        val separateRightExpr = !expr.right.isSimple && expr.right !is IFunctionCall
+
+        if(separateLeftExpr) {
+            val dt = expr.left.inferType(program)
+            val name = when {
+                // TODO assume (hope) cx16.r9 isn't used for anything else...
+                dt.istype(DataType.UBYTE) -> listOf("cx16","r9L")
+                dt.istype(DataType.BYTE) -> listOf("cx16","r9sL")
+                dt.istype(DataType.UWORD) -> listOf("cx16","r9")
+                dt.istype(DataType.WORD) -> listOf("cx16","r9s")
+                else -> throw AssemblyError("invalid dt")
+            }
+            leftOperandReplacement = IdentifierReference(name, expr.position)
+            leftAssignment = Assignment(
+                AssignTarget(IdentifierReference(name, expr.position), null, null, expr.position),
+                expr.left,
+                expr.position
+            )
+        }
+        if(separateRightExpr) {
+            val dt = expr.right.inferType(program)
+            val name = when {
+                dt.istype(DataType.UBYTE) -> listOf("prog8_lib","retval_interm_ub")
+                dt.istype(DataType.UWORD) -> listOf("prog8_lib","retval_interm_uw")
+                dt.istype(DataType.BYTE) -> listOf("prog8_lib","retval_interm_b2")
+                dt.istype(DataType.WORD) -> listOf("prog8_lib","retval_interm_w2")
+                else -> throw AssemblyError("invalid dt")
+            }
+            rightOperandReplacement = IdentifierReference(name, expr.position)
+            rightAssignment = Assignment(
+                AssignTarget(IdentifierReference(name, expr.position), null, null, expr.position),
+                expr.right,
+                expr.position
+            )
+        }
+        return CondExprSimplificationResult(
+            leftAssignment, leftOperandReplacement,
+            rightAssignment, rightOperandReplacement
+        )
    }

    @Suppress("DuplicatedCode")
@@ -224,7 +301,26 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, private val o
            val booleanExpr = BinaryExpression(untilLoop.condition, "!=", NumericLiteralValue.optimalInteger(0, untilLoop.condition.position), untilLoop.condition.position)
            return listOf(IAstModification.ReplaceNode(untilLoop.condition, booleanExpr, untilLoop))
        }
-        return noModifications
+
+        if((binExpr.left as? NumericLiteralValue)?.number==0 &&
+            (binExpr.right as? NumericLiteralValue)?.number!=0)
+            throw FatalAstException("0==X should have been swapped to if X==0")
+
+        // simplify the conditional expression, introduce simple assignments if required.
+        // NOTE: sometimes this increases code size because additional stores/loads are generated for the
+        //       intermediate variables. We assume these are optimized away from the resulting assembly code later.
+        val simplify = simplifyConditionalExpression(binExpr)
+        val modifications = mutableListOf<IAstModification>()
+        if(simplify.rightVarAssignment!=null) {
+            modifications += IAstModification.ReplaceNode(binExpr.right, simplify.rightOperandReplacement!!, binExpr)
+            modifications += IAstModification.InsertLast(simplify.rightVarAssignment, untilLoop.body)
+        }
+        if(simplify.leftVarAssignment!=null) {
+            modifications += IAstModification.ReplaceNode(binExpr.left, simplify.leftOperandReplacement!!, binExpr)
+            modifications += IAstModification.InsertLast(simplify.leftVarAssignment, untilLoop.body)
+        }
+
+        return modifications
    }

    @Suppress("DuplicatedCode")
@@ -242,6 +338,18 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, private val o
            val booleanExpr = BinaryExpression(whileLoop.condition, "!=", NumericLiteralValue.optimalInteger(0, whileLoop.condition.position), whileLoop.condition.position)
            return listOf(IAstModification.ReplaceNode(whileLoop.condition, booleanExpr, whileLoop))
        }
+
+        if((binExpr.left as? NumericLiteralValue)?.number==0 &&
+            (binExpr.right as? NumericLiteralValue)?.number!=0)
+            throw FatalAstException("0==X should have been swapped to if X==0")
+
+        // TODO simplify the conditional expression, introduce simple assignments if required.
+        // NOTE: sometimes this increases code size because additional stores/loads are generated for the
+        //       intermediate variables. We assume these are optimized away from the resulting assembly code later.
+        // NOTE: this is nasty for a while-statement as the condition occurs at the top of the loop
+        //       so the expression needs to be evaluated also before the loop is entered...
+        //       but I don't want to duplicate the expression.
+        // val simplify = simplifyConditionalExpression(binExpr)
        return noModifications
    }

@@ -255,13 +363,15 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, private val o
            if(dt1 in ByteDatatypes) {
                if(dt2 in ByteDatatypes)
                    return noModifications
-                val cast1 = TypecastExpression(arg1, if(dt1==DataType.UBYTE) DataType.UWORD else DataType.WORD, true, functionCallStatement.position)
-                return listOf(IAstModification.ReplaceNode(arg1, cast1, functionCallStatement))
+                val (replaced, cast) = arg1.typecastTo(if(dt1==DataType.UBYTE) DataType.UWORD else DataType.WORD, dt1, true)
+                if(replaced)
+                    return listOf(IAstModification.ReplaceNode(arg1, cast, functionCallStatement))
            } else {
                if(dt2 in WordDatatypes)
                    return noModifications
-                val cast2 = TypecastExpression(arg2, if(dt2==DataType.UBYTE) DataType.UWORD else DataType.WORD, true, functionCallStatement.position)
-                return listOf(IAstModification.ReplaceNode(arg2, cast2, functionCallStatement))
+                val (replaced, cast) = arg2.typecastTo(if(dt2==DataType.UBYTE) DataType.UWORD else DataType.WORD, dt2, true)
+                if(replaced)
+                    return listOf(IAstModification.ReplaceNode(arg2, cast, functionCallStatement))
            }
        }
        return noModifications
@@ -325,10 +435,10 @@ internal class BeforeAsmGenerationAstChanger(val program: Program, private val o
        val modifications = mutableListOf<IAstModification>()
        val statement = expr.containingStatement
        val dt = expr.indexer.indexExpr.inferType(program)
-        val register = if(dt istype DataType.UBYTE  || dt istype DataType.BYTE ) "r9L" else "r9"
+        val register = if(dt istype DataType.UBYTE  || dt istype DataType.BYTE ) "retval_interm_ub" else "retval_interm_b"
        // replace the indexer with just the variable (simply use a cx16 virtual register r9, that we HOPE is not used for other things in the expression...)
        // assign the indexing expression to the helper variable, but only if that hasn't been done already
-        val target = AssignTarget(IdentifierReference(listOf("cx16", register), expr.indexer.position), null, null, expr.indexer.position)
+        val target = AssignTarget(IdentifierReference(listOf("prog8_lib", register), expr.indexer.position), null, null, expr.indexer.position)
        val assign = Assignment(target, expr.indexer.indexExpr, expr.indexer.position)
        modifications.add(IAstModification.InsertBefore(statement, assign, statement.parent as IStatementContainer))
        modifications.add(IAstModification.ReplaceNode(expr.indexer.indexExpr, target.identifier!!.copy(), expr.indexer))
@@ -44,6 +44,8 @@ fun compileProgram(filepath: Path,
    lateinit var program: Program
    lateinit var importedFiles: List<Path>

+    val optimizeFloatExpr = if(optimize) optimizeFloatExpressions else false
+
    val compTarget =
        when(compilationTarget) {
            C64Target.name -> C64Target
@@ -58,7 +60,7 @@ fun compileProgram(filepath: Path,
            with(compilationOptions) {
                this.slowCodegenWarnings = slowCodegenWarnings
                this.optimize = optimize
-                this.optimizeFloatExpressions = optimizeFloatExpressions
+                this.optimizeFloatExpressions = optimizeFloatExpr
            }
            program = programresult
            importedFiles = imported
@@ -20,7 +20,7 @@ internal class AstChecker(private val program: Program,
 ) : IAstVisitor {

    override fun visit(program: Program) {
-        assert(program === this.program)
+        require(program === this.program)
        // there must be a single 'main' block with a 'start' subroutine for the program entry point.
        val mainBlocks = program.modules.flatMap { it.statements }.filter { b -> b is Block && b.name=="main" }.map { it as Block }
        if(mainBlocks.size>1)
@@ -161,7 +161,6 @@ internal class AstChecker(private val program: Program,
        super.visit(forLoop)
    }

-
    override fun visit(jump: Jump) {
        val ident = jump.identifier
        if(ident!=null) {
@@ -430,7 +429,7 @@ internal class AstChecker(private val program: Program,
            if(targetDt.isIterable)
                errors.err("cannot assign value to string or array", assignment.value.position)
            else if(!(valueDt istype DataType.STR && targetDt istype DataType.UWORD))
-                errors.err("type of value doesn't match target", assignment.value.position)
+                errors.err("type of value $valueDt doesn't match target $targetDt", assignment.value.position)
        }

        if(assignment.value is TypecastExpression) {
@@ -53,7 +53,6 @@ internal class StatementReorderer(val program: Program, val errors: IErrorReport
                        decl.value = null
                        if(decl.name.startsWith("retval_interm_") && decl.definingScope.name=="prog8_lib") {
                            // no need to zero out the special internal returnvalue intermediates.
-                            // TODO these variables are no longer used???
                            return noModifications
                        }
                        val nextStmt  = decl.nextSibling()
@@ -170,8 +169,9 @@ internal class StatementReorderer(val program: Program, val errors: IErrorReport
                        is Subroutine -> {
                            val paramType = callee.parameters[argnum].type
                            if(leftDt isAssignableTo paramType) {
-                                val cast = TypecastExpression(expr.left, paramType, true, parent.position)
-                                return listOf(IAstModification.ReplaceNode(expr.left, cast, expr))
+                                val (replaced, cast) = expr.left.typecastTo(paramType, leftDt.getOr(DataType.UNDEFINED), true)
+                                if(replaced)
+                                    return listOf(IAstModification.ReplaceNode(expr.left, cast, expr))
                            }
                        }
                        is BuiltinFunctionStatementPlaceholder -> {
@@ -179,8 +179,9 @@ internal class StatementReorderer(val program: Program, val errors: IErrorReport
                            val paramTypes = func.parameters[argnum].possibleDatatypes
                            for(type in paramTypes) {
                                if(leftDt isAssignableTo type) {
-                                    val cast = TypecastExpression(expr.left, type, true, parent.position)
-                                    return listOf(IAstModification.ReplaceNode(expr.left, cast, expr))
+                                    val (replaced, cast) = expr.left.typecastTo(type, leftDt.getOr(DataType.UNDEFINED), true)
+                                    if(replaced)
+                                        return listOf(IAstModification.ReplaceNode(expr.left, cast, expr))
                                }
                            }
                        }
@@ -47,7 +47,7 @@ class TypecastsAdder(val program: Program, val errors: IErrorReporter) : AstWalk
        val rightDt = expr.right.inferType(program)
        if(leftDt.isKnown && rightDt.isKnown && leftDt!=rightDt) {
            // determine common datatype and add typecast as required to make left and right equal types
-            val (commonDt, toFix) = BinaryExpression.commonDatatype(leftDt.getOr(DataType.UNDEFINED), rightDt.getOr(DataType.UNDEFINED), expr.left, expr.right)
+            val (commonDt, toFix) = BinaryExpression.commonDatatype(leftDt.getOr(DataType.UNDEFINED), rightDt.getOr(DataType.UNDEFINED), expr.left, expr.operator, expr.right)
            if(toFix!=null) {
                return when {
                    toFix===expr.left -> listOf(IAstModification.ReplaceNode(
@@ -74,6 +74,14 @@ internal class VariousCleanups(val program: Program, val errors: IErrorReporter)
        if(sourceDt istype typecast.type)
            return listOf(IAstModification.ReplaceNode(typecast, typecast.expression, parent))

+        if(parent is Assignment) {
+            val targetDt = (parent).target.inferType(program).getOrElse { throw FatalAstException("invalid dt") }
+            if(sourceDt istype targetDt) {
+                // we can get rid of this typecast because the type is already
+                return listOf(IAstModification.ReplaceNode(typecast, typecast.expression, parent))
+            }
+        }
+
        return noModifications
    }

@@ -83,8 +83,13 @@ class VerifyFunctionArgTypes(val program: Program) : IAstVisitor {
                    val anyCompatible = pair.second.any { argTypeCompatible(pair.first, it) }
                    if (!anyCompatible) {
                        val actual = pair.first.toString()
-                        val expected = pair.second.toString()
-                        return "argument ${index + 1} type mismatch, was: $actual expected: $expected"
+                        return if(pair.second.size==1) {
+                            val expected = pair.second[0].toString()
+                            "argument ${index + 1} type mismatch, was: $actual expected: $expected"
+                        } else {
+                            val expected = pair.second.toList().toString()
+                            "argument ${index + 1} type mismatch, was: $actual expected one of: $expected"
+                        }
                    }
                }
            }
@@ -2,11 +2,6 @@ package prog8tests

 import com.github.michaelbull.result.getErrorOrElse
 import com.github.michaelbull.result.getOrElse
-import org.hamcrest.MatcherAssert.assertThat
-import org.hamcrest.Matchers.equalTo
-import org.hamcrest.Matchers.nullValue
-import org.hamcrest.core.Is
-import org.junit.jupiter.api.*
 import prog8.ast.Program
 import prog8.ast.internedStringsModuleName
 import prog8.compiler.ModuleImporter
@@ -19,119 +14,91 @@ import prog8tests.helpers.DummyFunctions
 import prog8tests.helpers.DummyMemsizer
 import prog8tests.helpers.DummyStringEncoder
 import kotlin.io.path.*
-import kotlin.test.assertContains
-import kotlin.test.assertFailsWith
-import kotlin.test.assertFalse
-import kotlin.test.fail
+import io.kotest.assertions.fail
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.collections.shouldBeIn
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.string.shouldContain


-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestModuleImporter {
-    private val count = listOf("1st", "2nd", "3rd", "4th", "5th")
+class TestModuleImporter: FunSpec({
+    val count = listOf("1st", "2nd", "3rd", "4th", "5th")

-    private lateinit var program: Program
-    @BeforeEach
-    fun beforeEach() {
+    lateinit var program: Program
+
+    beforeTest {
        program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
    }

-    private fun makeImporter(errors: IErrorReporter?, vararg searchIn: String): ModuleImporter {
+    fun makeImporter(errors: IErrorReporter? = null, searchIn: Iterable<String>) =
+        ModuleImporter(program, "blah", errors ?: ErrorReporterForTests(false), searchIn.toList())
+
+    fun makeImporter(errors: IErrorReporter?, vararg searchIn: String): ModuleImporter {
        return makeImporter(errors, searchIn.asList())
    }

-    private fun makeImporter(errors: IErrorReporter? = null, searchIn: Iterable<String>) =
-        ModuleImporter(program, "blah", errors ?: ErrorReporterForTests(false), searchIn.toList())
+    context("ImportModule") {

-    @Nested
-    inner class Constructor {
-
-        @Test
-        @Disabled("TODO: invalid entries in search list")
-        fun testInvalidEntriesInSearchList() {}
-
-        @Test
-        @Disabled("TODO: literal duplicates in search list")
-        fun testLiteralDuplicatesInSearchList() {}
-
-        @Test
-        @Disabled("TODO: factual duplicates in search list")
-        fun testFactualDuplicatesInSearchList() {}
-    }
-
-    @Nested
-    inner class ImportModule {
-
-        @Nested
-        inner class WithInvalidPath {
-            @Test
-            fun testNonexisting() {
+        context("WithInvalidPath") {
+            test("testNonexisting") {
                val dirRel = assumeDirectory(".", workingDir.relativize(fixturesDir))
                val importer = makeImporter(null, dirRel.invariantSeparatorsPathString)
                val srcPathRel = assumeNotExists(dirRel, "i_do_not_exist")
                val srcPathAbs = srcPathRel.absolute()
                val error1 = importer.importModule(srcPathRel).getErrorOrElse { fail("should have import error") }
-                assertThat(
-                    ".file should be normalized",
-                    "${error1.file}", equalTo("${error1.file.normalize()}")
-                )
-                assertThat(
-                    ".file should point to specified path",
-                    error1.file.absolutePath, equalTo("${srcPathAbs.normalize()}")
-                )
-                assertThat(program.modules.size, equalTo(1))
+                withClue(".file should be normalized") {
+                    "${error1.file}" shouldBe "${error1.file.normalize()}"
+                }
+                withClue(".file should point to specified path") {
+                    error1.file.absolutePath shouldBe "${srcPathAbs.normalize()}"
+                }
+                program.modules.size shouldBe 1

                val error2 = importer.importModule(srcPathAbs).getErrorOrElse { fail("should have import error") }
-                assertThat(
-                    ".file should be normalized",
-                    "${error2.file}", equalTo("${error2.file.normalize()}")
-                )
-                assertThat(
-                    ".file should point to specified path",
-                    error2.file.absolutePath, equalTo("${srcPathAbs.normalize()}")
-                )
-                assertThat(program.modules.size, equalTo(1))
+                withClue(".file should be normalized") {
+                    "${error2.file}" shouldBe "${error2.file.normalize()}"
+                }
+                withClue(".file should point to specified path") {
+                    error2.file.absolutePath shouldBe "${srcPathAbs.normalize()}"
+                }
+                program.modules.size shouldBe 1
            }

-            @Test
-            fun testDirectory() {
+            test("testDirectory") {
                val srcPathRel = assumeDirectory(workingDir.relativize(fixturesDir))
                val srcPathAbs = srcPathRel.absolute()
                val searchIn = Path(".", "$srcPathRel").invariantSeparatorsPathString
                val importer = makeImporter(null, searchIn)

-                assertFailsWith<AccessDeniedException> { importer.importModule(srcPathRel) }
+                shouldThrow<AccessDeniedException> { importer.importModule(srcPathRel) }
                    .let {
-                        assertThat(
-                            ".file should be normalized",
-                            "${it.file}", equalTo("${it.file.normalize()}")
-                        )
-                        assertThat(
-                            ".file should point to specified path",
-                            it.file.absolutePath, equalTo("${srcPathAbs.normalize()}")
-                        )
+                        withClue(".file should be normalized") {
+                            "${it.file}" shouldBe "${it.file.normalize()}"
+                        }
+                        withClue(".file should point to specified path") {
+                            it.file.absolutePath shouldBe "${srcPathAbs.normalize()}"
+                        }
                    }
-                assertThat(program.modules.size, equalTo(1))
+                program.modules.size shouldBe 1

-                assertFailsWith<AccessDeniedException> { importer.importModule(srcPathAbs) }
+                shouldThrow<AccessDeniedException> { importer.importModule(srcPathAbs) }
                    .let {
-                        assertThat(
-                            ".file should be normalized",
-                            "${it.file}", equalTo("${it.file.normalize()}")
-                        )
-                        assertThat(
-                            ".file should point to specified path",
-                            it.file.absolutePath, equalTo("${srcPathAbs.normalize()}")
-                        )
+                        withClue(".file should be normalized") {
+                            "${it.file}" shouldBe "${it.file.normalize()}"
+                        }
+                        withClue(".file should point to specified path") {
+                            it.file.absolutePath shouldBe "${srcPathAbs.normalize()}"
+                        }
                    }
-                assertThat(program.modules.size, equalTo(1))
+                program.modules.size shouldBe 1
            }
        }

-        @Nested
-        inner class WithValidPath {
+        context("WithValidPath") {

-            @Test
-            fun testAbsolute() {
+            test("testAbsolute") {
                val searchIn = listOf(
                    Path(".").div(workingDir.relativize(fixturesDir)), // we do want a dot "." in front
                ).map { it.invariantSeparatorsPathString }
@@ -140,29 +107,29 @@ class TestModuleImporter {
                val path = assumeReadableFile(searchIn[0], fileName)

                val module = importer.importModule(path.absolute()).getOrElse { throw it }
-                assertThat(program.modules.size, equalTo(2))
-                assertContains(program.modules, module)
-                assertThat(module.program, equalTo(program))
+                program.modules.size shouldBe 2
+                module shouldBeIn program.modules
+                module.program shouldBe program
            }

-            @Test
-            fun testRelativeToWorkingDir() {
+            test("testRelativeToWorkingDir") {
                val searchIn = listOf(
                    Path(".").div(workingDir.relativize(fixturesDir)), // we do want a dot "." in front
                ).map { it.invariantSeparatorsPathString }
                val importer = makeImporter(null, searchIn)
                val fileName = "simple_main.p8"
                val path = assumeReadableFile(searchIn[0], fileName)
-                assertThat("sanity check: path should NOT be absolute", path.isAbsolute, equalTo(false))
+                withClue("sanity check: path should NOT be absolute") {
+                    path.isAbsolute shouldBe false
+                }

                val module = importer.importModule(path).getOrElse { throw it }
-                assertThat(program.modules.size, equalTo(2))
-                assertContains(program.modules, module)
-                assertThat(module.program, equalTo(program))
+                program.modules.size shouldBe 2
+                module shouldBeIn program.modules
+                module.program shouldBe program
            }

-            @Test
-            fun testRelativeTo1stDirInSearchList() {
+            test("testRelativeTo1stDirInSearchList") {
                val searchIn = Path(".")
                    .div(workingDir.relativize(fixturesDir))
                    .invariantSeparatorsPathString
@@ -172,51 +139,32 @@ class TestModuleImporter {
                assumeReadableFile(searchIn, path)

                val module = importer.importModule(path).getOrElse { throw it }
-                assertThat(program.modules.size, equalTo(2))
-                assertContains(program.modules, module)
-                assertThat(module.program, equalTo(program))
+                program.modules.size shouldBe 2
+                module shouldBeIn program.modules
+                module.program shouldBe program
            }

-            @Test
-            @Disabled("TODO: relative to 2nd in search list")
-            fun testRelativeTo2ndDirInSearchList() {}
-
-            @Test
-            @Disabled("TODO: ambiguous - 2 or more really different candidates")
-            fun testAmbiguousCandidates() {}
-
-            @Nested
-            inner class WithBadFile {
-                @Test
-                fun testWithSyntaxError() {
+            context("WithBadFile") {
+                test("testWithSyntaxError") {
                    val searchIn = assumeDirectory("./", workingDir.relativize(fixturesDir))
                    val importer = makeImporter(null, searchIn.invariantSeparatorsPathString)
                    val srcPath = assumeReadableFile(fixturesDir, "file_with_syntax_error.p8")

                    val act = { importer.importModule(srcPath) }

-                    repeat(2) { n ->
-                        assertFailsWith<ParseError>(count[n] + " call") { act() }.let {
-                            assertThat(it.position.file, equalTo(SourceCode.relative(srcPath).toString()))
-                            assertThat("line; should be 1-based", it.position.line, equalTo(2))
-                            assertThat("startCol; should be 0-based", it.position.startCol, equalTo(6))
-                            assertThat("endCol; should be 0-based", it.position.endCol, equalTo(6))
+                    repeat(2) { n -> withClue(count[n] + " call") {
+                            shouldThrow<ParseError>() { act() }.let {
+                                it.position.file shouldBe SourceCode.relative(srcPath).toString()
+                                withClue("line; should be 1-based") { it.position.line shouldBe 2 }
+                                withClue("startCol; should be 0-based") { it.position.startCol shouldBe 6 }
+                                withClue("endCol; should be 0-based") { it.position.endCol shouldBe 6 }
+                            }
                        }
-                        assertThat(program.modules.size, equalTo(1))
+                        program.modules.size shouldBe 1
                    }
                }

-                @Test
-                fun testImportingFileWithSyntaxError_once() {
-                    doTestImportingFileWithSyntaxError(1)
-                }
-
-                @Test
-                fun testImportingFileWithSyntaxError_twice() {
-                    doTestImportingFileWithSyntaxError(2)
-                }
-
-                private fun doTestImportingFileWithSyntaxError(repetitions: Int) {
+                fun doTestImportingFileWithSyntaxError(repetitions: Int) {
                    val searchIn = assumeDirectory("./", workingDir.relativize(fixturesDir))
                    val importer = makeImporter(null, searchIn.invariantSeparatorsPathString)
                    val importing = assumeReadableFile(fixturesDir, "import_file_with_syntax_error.p8")
@@ -224,28 +172,33 @@ class TestModuleImporter {

                    val act = { importer.importModule(importing) }

-                    repeat(repetitions) { n ->
-                        assertFailsWith<ParseError>(count[n] + " call") { act() }.let {
-                            assertThat(it.position.file, equalTo(SourceCode.relative(imported).toString()))
-                            assertThat("line; should be 1-based", it.position.line, equalTo(2))
-                            assertThat("startCol; should be 0-based", it.position.startCol, equalTo(6))
-                            assertThat("endCol; should be 0-based", it.position.endCol, equalTo(6))
+                    repeat(repetitions) { n -> withClue(count[n] + " call") {
+                        shouldThrow<ParseError>() { act() }.let {
+                            it.position.file shouldBe SourceCode.relative(imported).toString()
+                            withClue("line; should be 1-based") { it.position.line shouldBe 2 }
+                            withClue("startCol; should be 0-based") { it.position.startCol shouldBe 6 }
+                            withClue("endCol; should be 0-based") { it.position.endCol shouldBe 6 }
                        }
-                        assertThat("imported module with error in it should not be present", program.modules.size, equalTo(1))
-                        assertThat(program.modules[0].name, equalTo(internedStringsModuleName))
                    }
+                        withClue("imported module with error in it should not be present") { program.modules.size shouldBe 1 }
+                        program.modules[0].name shouldBe internedStringsModuleName
+                    }
+                }
+
+                test("testImportingFileWithSyntaxError_once") {
+                    doTestImportingFileWithSyntaxError(1)
+                }
+
+                test("testImportingFileWithSyntaxError_twice") {
+                    doTestImportingFileWithSyntaxError(2)
                }
            }
        }
-
    }

-    @Nested
-    inner class ImportLibraryModule {
-        @Nested
-        inner class WithInvalidName {
-            @Test
-            fun testWithNonExistingName() {
+    context("ImportLibraryModule") {
+        context("WithInvalidName") {
+            test("testWithNonExistingName") {
                val searchIn = assumeDirectory("./", workingDir.relativize(fixturesDir))
                val errors = ErrorReporterForTests(false)
                val importer = makeImporter(errors, searchIn.invariantSeparatorsPathString)
@@ -254,46 +207,45 @@ class TestModuleImporter {

                repeat(2) { n ->
                    val result = importer.importLibraryModule(filenameNoExt)
-                    assertThat(count[n] + " call / NO .p8 extension", result, Is(nullValue()))
-                    assertFalse(errors.noErrors(), count[n] + " call / NO .p8 extension")
-                    assertContains(errors.errors.single(), "0:0: no module found with name i_do_not_exist")
+                    withClue(count[n] + " call / NO .p8 extension") { result shouldBe null }
+                    withClue(count[n] + " call / NO .p8 extension") { errors.noErrors() shouldBe false }
+                    errors.errors.single() shouldContain "0:0: no module found with name i_do_not_exist"
                    errors.report()
-                    assertThat(program.modules.size, equalTo(1))
+                    program.modules.size shouldBe 1

                    val result2 = importer.importLibraryModule(filenameWithExt)
-                    assertThat(count[n] + " call / with .p8 extension", result2, Is(nullValue()))
-                    assertFalse(importer.errors.noErrors(), count[n] + " call / with .p8 extension")
-                    assertContains(errors.errors.single(), "0:0: no module found with name i_do_not_exist.p8")
+                    withClue(count[n] + " call / with .p8 extension") { result2 shouldBe null }
+                    withClue(count[n] + " call / with .p8 extension") { importer.errors.noErrors() shouldBe false }
+                    errors.errors.single() shouldContain "0:0: no module found with name i_do_not_exist.p8"
                    errors.report()
-                    assertThat(program.modules.size, equalTo(1))
+                    program.modules.size shouldBe 1
                }
            }
        }

-        @Nested
-        inner class WithValidName {
-            @Nested
-            inner class WithBadFile {
-                @Test
-                fun testWithSyntaxError() {
+        context("WithValidName") {
+            context("WithBadFile") {
+                test("testWithSyntaxError") {
                    val searchIn = assumeDirectory("./", workingDir.relativize(fixturesDir))
                    val importer = makeImporter(null, searchIn.invariantSeparatorsPathString)
                    val srcPath = assumeReadableFile(fixturesDir, "file_with_syntax_error.p8")

-                    repeat(2) { n ->
-                        assertFailsWith<ParseError>(count[n] + " call")
-                            { importer.importLibraryModule(srcPath.nameWithoutExtension) }.let {
-                                assertThat(it.position.file, equalTo(SourceCode.relative(srcPath).toString()))
-                                assertThat("line; should be 1-based", it.position.line, equalTo(2))
-                                assertThat("startCol; should be 0-based", it.position.startCol, equalTo(6))
-                                assertThat("endCol; should be 0-based", it.position.endCol, equalTo(6))
+                    repeat(2) { n -> withClue(count[n] + " call") {
+                            shouldThrow<ParseError>()
+                            {
+                                importer.importLibraryModule(srcPath.nameWithoutExtension) }.let {
+                                it.position.file shouldBe SourceCode.relative(srcPath).toString()
+                                withClue("line; should be 1-based") { it.position.line shouldBe 2 }
+                                withClue("startCol; should be 0-based") { it.position.startCol shouldBe 6 }
+                                withClue("endCol; should be 0-based") { it.position.endCol shouldBe 6 }
                            }
-                        assertThat(program.modules.size, equalTo(1))
+                        }
+                        program.modules.size shouldBe 1
                    }
                }


-                private fun doTestImportingFileWithSyntaxError(repetitions: Int) {
+                fun doTestImportingFileWithSyntaxError(repetitions: Int) {
                    val searchIn = assumeDirectory("./", workingDir.relativize(fixturesDir))
                    val importer = makeImporter(null, searchIn.invariantSeparatorsPathString)
                    val importing = assumeReadableFile(fixturesDir, "import_file_with_syntax_error.p8")
@@ -301,29 +253,29 @@ class TestModuleImporter {

                    val act = { importer.importLibraryModule(importing.nameWithoutExtension) }

-                    repeat(repetitions) { n ->
-                        assertFailsWith<ParseError>(count[n] + " call") { act() }.let {
-                            assertThat(it.position.file, equalTo(SourceCode.relative(imported).toString()))
-                            assertThat("line; should be 1-based", it.position.line, equalTo(2))
-                            assertThat("startCol; should be 0-based", it.position.startCol, equalTo(6))
-                            assertThat("endCol; should be 0-based", it.position.endCol, equalTo(6))
+                    repeat(repetitions) { n -> withClue(count[n] + " call") {
+                            shouldThrow<ParseError>() {
+                                act() }.let {
+                                it.position.file shouldBe SourceCode.relative(imported).toString()
+                                withClue("line; should be 1-based") { it.position.line shouldBe 2 }
+                                withClue("startCol; should be 0-based") { it.position.startCol shouldBe 6 }
+                                withClue("endCol; should be 0-based") { it.position.endCol shouldBe 6 }
+                            }
                        }
-                        assertThat("imported module with error in it should not be present", program.modules.size, equalTo(1))
-                        assertThat(program.modules[0].name, equalTo(internedStringsModuleName))
+                        withClue("imported module with error in it should not be present") { program.modules.size shouldBe 1 }
+                        program.modules[0].name shouldBe internedStringsModuleName
                        importer.errors.report()
                    }
                }

-                @Test
-                fun testImportingFileWithSyntaxError_once() {
+                test("testImportingFileWithSyntaxError_once") {
                    doTestImportingFileWithSyntaxError(1)
                }

-                @Test
-                fun testImportingFileWithSyntaxError_twice() {
+                test("testImportingFileWithSyntaxError_twice") {
                    doTestImportingFileWithSyntaxError(2)
                }
            }
        }
    }
-}
+})
@@ -0,0 +1,58 @@
+package prog8tests
+
+import io.kotest.core.config.AbstractProjectConfig
+import io.kotest.core.listeners.Listener
+import io.kotest.core.listeners.TestListener
+import io.kotest.core.spec.Spec
+import io.kotest.extensions.system.NoSystemErrListener
+import io.kotest.extensions.system.NoSystemOutListener
+import java.io.ByteArrayOutputStream
+import java.io.PrintStream
+import kotlin.math.max
+
+object ProjectConfig : AbstractProjectConfig() {
+    override val parallelism = 2 // max(2, Runtime.getRuntime().availableProcessors() / 2)
+    // override fun listeners() = listOf(SystemOutToNullListener)
+}
+
+//object SystemOutToNullListener: TestListener {
+//    override suspend fun beforeSpec(spec: Spec) = setup()
+//
+//    private fun setup() {
+//        System.setOut(object: PrintStream(object: ByteArrayOutputStream(){
+//            override fun write(p0: Int) {
+//                // do nothing
+//            }
+//
+//            override fun write(b: ByteArray, off: Int, len: Int) {
+//                // do nothing
+//            }
+//
+//            override fun write(b: ByteArray) {
+//                // do nothing
+//            }
+//        }){}
+//        )
+//    }
+//}
+//
+//object SystemErrToNullListener: TestListener {
+//    override suspend fun beforeSpec(spec: Spec) = setup()
+//
+//    private fun setup() {
+//        System.setErr(object: PrintStream(object: ByteArrayOutputStream(){
+//            override fun write(p0: Int) {
+//                // do nothing
+//            }
+//
+//            override fun write(b: ByteArray, off: Int, len: Int) {
+//                // do nothing
+//            }
+//
+//            override fun write(b: ByteArray) {
+//                // do nothing
+//            }
+//        }){}
+//        )
+//    }
+//}
@@ -1,21 +1,19 @@
 package prog8tests

-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.maps.shouldContainKey
+import io.kotest.matchers.maps.shouldNotContainKey
+import io.kotest.matchers.shouldBe
 import prog8.ast.statements.Block
 import prog8.ast.statements.Subroutine
 import prog8.compiler.target.C64Target
 import prog8.compilerinterface.CallGraph
 import prog8tests.helpers.assertSuccess
 import prog8tests.helpers.compileText
-import kotlin.test.assertEquals
-import kotlin.test.assertFalse
-import kotlin.test.assertTrue

-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestCallgraph {
-    @Test
-    fun testGraphForEmptySubs() {
+class TestCallgraph: FunSpec({
+    test("testGraphForEmptySubs") {
        val sourcecode = """
            %import string
            main {
@@ -28,32 +26,33 @@ class TestCallgraph {
        val result = compileText(C64Target, false, sourcecode).assertSuccess()
        val graph = CallGraph(result.program)

-        assertEquals(1, graph.imports.size)
-        assertEquals(1, graph.importedBy.size)
+        graph.imports.size shouldBe 1
+        graph.importedBy.size shouldBe 1
        val toplevelModule = result.program.toplevelModule
        val importedModule = graph.imports.getValue(toplevelModule).single()
-        assertEquals("string", importedModule.name)
+        importedModule.name shouldBe "string"
        val importedBy = graph.importedBy.getValue(importedModule).single()
-        assertTrue(importedBy.name.startsWith("on_the_fly_test"))
+        importedBy.name.startsWith("on_the_fly_test") shouldBe true

-        assertFalse(graph.unused(toplevelModule))
-        assertFalse(graph.unused(importedModule))
+        graph.unused(toplevelModule) shouldBe false
+        graph.unused(importedModule) shouldBe false

        val mainBlock = toplevelModule.statements.filterIsInstance<Block>().single()
        for(stmt in mainBlock.statements) {
            val sub = stmt as Subroutine
-            assertFalse(sub in graph.calls)
-            assertFalse(sub in graph.calledBy)
+            graph.calls shouldNotContainKey sub
+            graph.calledBy shouldNotContainKey sub

            if(sub === result.program.entrypoint)
-                assertFalse(graph.unused(sub), "start() should always be marked as used to avoid having it removed")
+                withClue("start() should always be marked as used to avoid having it removed") {
+                    graph.unused(sub) shouldBe false
+                }
            else
-                assertTrue(graph.unused(sub))
+                graph.unused(sub) shouldBe true
        }
    }

-    @Test
-    fun testGraphForEmptyButReferencedSub() {
+    test("testGraphForEmptyButReferencedSub") {
        val sourcecode = """
            %import string
            main {
@@ -68,24 +67,32 @@ class TestCallgraph {
        val result = compileText(C64Target, false, sourcecode).assertSuccess()
        val graph = CallGraph(result.program)

-        assertEquals(1, graph.imports.size)
-        assertEquals(1, graph.importedBy.size)
+        graph.imports.size shouldBe 1
+        graph.importedBy.size shouldBe 1
        val toplevelModule = result.program.toplevelModule
        val importedModule = graph.imports.getValue(toplevelModule).single()
-        assertEquals("string", importedModule.name)
+        importedModule.name shouldBe "string"
        val importedBy = graph.importedBy.getValue(importedModule).single()
-        assertTrue(importedBy.name.startsWith("on_the_fly_test"))
+        importedBy.name.startsWith("on_the_fly_test") shouldBe true

-        assertFalse(graph.unused(toplevelModule))
-        assertFalse(graph.unused(importedModule))
+        graph.unused(toplevelModule) shouldBe false
+        graph.unused(importedModule) shouldBe false

        val mainBlock = toplevelModule.statements.filterIsInstance<Block>().single()
        val startSub = mainBlock.statements.filterIsInstance<Subroutine>().single{it.name=="start"}
        val emptySub = mainBlock.statements.filterIsInstance<Subroutine>().single{it.name=="empty"}

-        assertTrue(startSub in graph.calls, "start 'calls' (references) empty")
-        assertFalse(emptySub in graph.calls, "empty doesn't call anything")
-        assertTrue(emptySub in graph.calledBy, "empty gets 'called'")
-        assertFalse(startSub in graph.calledBy, "start doesn't get called (except as entrypoint ofc.)")
+        withClue("start 'calls' (references) empty") {
+            graph.calls shouldContainKey startSub
+        }
+        withClue("empty doesn't call anything") {
+            graph.calls shouldNotContainKey emptySub
+        }
+        withClue("empty gets 'called'") {
+            graph.calledBy shouldContainKey emptySub
+        }
+        withClue( "start doesn't get called (except as entrypoint ofc.)") {
+            graph.calledBy shouldNotContainKey startSub
+        }
    }
-}
+})
@@ -1,7 +1,10 @@
 package prog8tests

-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.assertions.fail
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.types.instanceOf
 import prog8.ast.IFunctionCall
 import prog8.ast.base.DataType
 import prog8.ast.base.VarDeclType
@@ -11,9 +14,6 @@ import prog8.ast.statements.Assignment
 import prog8.compiler.target.Cx16Target
 import prog8tests.helpers.assertSuccess
 import prog8tests.helpers.compileText
-import kotlin.test.assertEquals
-import kotlin.test.assertIs
-import kotlin.test.assertNull


 /**
@@ -21,11 +21,9 @@ import kotlin.test.assertNull
 * They are not really unit tests, but rather tests of the whole process,
 * from source file loading all the way through to running 64tass.
 */
-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestCompilerOnCharLit {
+class TestCompilerOnCharLit: FunSpec({

-    @Test
-    fun testCharLitAsRomsubArg() {
+    test("testCharLitAsRomsubArg") {
        val platform = Cx16Target
        val result = compileText(platform, false, """
            main {
@@ -40,15 +38,15 @@ class TestCompilerOnCharLit {
        val startSub = program.entrypoint
        val funCall = startSub.statements.filterIsInstance<IFunctionCall>()[0]

-        assertIs<NumericLiteralValue>(funCall.args[0],
-            "char literal should have been replaced by ubyte literal")
+        withClue("char literal should have been replaced by ubyte literal") {
+            funCall.args[0] shouldBe instanceOf<NumericLiteralValue>()
+        }
        val arg = funCall.args[0] as NumericLiteralValue
-        assertEquals(DataType.UBYTE, arg.type)
-        assertEquals(platform.encodeString("\n", false)[0], arg.number.toShort())
+        arg.type shouldBe DataType.UBYTE
+        arg.number.toShort() shouldBe platform.encodeString("\n", false)[0]
    }

-    @Test
-    fun testCharVarAsRomsubArg() {
+    test("testCharVarAsRomsubArg") {
        val platform = Cx16Target
        val result = compileText(platform, false, """
            main {
@@ -64,28 +62,31 @@ class TestCompilerOnCharLit {
        val startSub = program.entrypoint
        val funCall = startSub.statements.filterIsInstance<IFunctionCall>()[0]

-        assertIs<IdentifierReference>(funCall.args[0])
+        funCall.args[0] shouldBe instanceOf<IdentifierReference>()
        val arg = funCall.args[0] as IdentifierReference
        val decl = arg.targetVarDecl(program)!!
-        assertEquals(VarDeclType.VAR, decl.type)
-        assertEquals(DataType.UBYTE, decl.datatype)
+        decl.type shouldBe VarDeclType.VAR
+        decl.datatype shouldBe DataType.UBYTE

        // TODO: assertIs<CharLiteral>(decl.value,
        //          "char literals should be kept until code gen")
        //       val initializerValue = decl.value as CharLiteral
        //       assertEquals('\n', (initializerValue as CharLiteral).value)

-        assertNull(decl.value, "initializer value should have been moved to separate assignment")
+        withClue("initializer value should have been moved to separate assignment"){
+            decl.value shouldBe null
+        }
        val assignInitialValue = decl.nextSibling() as Assignment
-        assertEquals(listOf("ch"), assignInitialValue.target.identifier!!.nameInSource)
-        assertIs<NumericLiteralValue>(assignInitialValue.value, "char literal should have been replaced by ubyte literal")
+        assignInitialValue.target.identifier!!.nameInSource shouldBe listOf("ch")
+        withClue("char literal should have been replaced by ubyte literal") {
+            assignInitialValue.value shouldBe instanceOf<NumericLiteralValue>()
+        }
        val initializerValue = assignInitialValue.value as NumericLiteralValue
-        assertEquals(DataType.UBYTE, initializerValue.type)
-        assertEquals(platform.encodeString("\n", false)[0], initializerValue.number.toShort())
+        initializerValue.type shouldBe DataType.UBYTE
+        initializerValue.number.toShort() shouldBe platform.encodeString("\n", false)[0]
    }

-    @Test
-    fun testCharConstAsRomsubArg() {
+    test("testCharConstAsRomsubArg") {
        val platform = Cx16Target
        val result = compileText(platform, false, """
            main {
@@ -105,20 +106,15 @@ class TestCompilerOnCharLit {
        when (val arg = funCall.args[0]) {
            is IdentifierReference -> {
                val decl = arg.targetVarDecl(program)!!
-                assertEquals(VarDeclType.CONST, decl.type)
-                assertEquals(DataType.UBYTE, decl.datatype)
-                assertEquals(
-                    platform.encodeString("\n", false)[0],
-                    (decl.value as NumericLiteralValue).number.toShort())
+                decl.type shouldBe VarDeclType.CONST
+                decl.datatype shouldBe DataType.UBYTE
+                (decl.value as NumericLiteralValue).number.toShort() shouldBe platform.encodeString("\n", false)[0]
            }
            is NumericLiteralValue -> {
-                assertEquals(
-                    platform.encodeString("\n", false)[0],
-                    arg.number.toShort())
+                arg.number.toShort() shouldBe platform.encodeString("\n", false)[0]
            }
-            else -> assertIs<IdentifierReference>(funCall.args[0]) // make test fail
+            else -> fail("invalid arg type") // funCall.args[0] shouldBe instanceOf<IdentifierReference>() // make test fail
        }
    }

-}
-
+})
@@ -1,18 +1,13 @@
 package prog8tests

-import org.junit.jupiter.api.DynamicTest
-import org.junit.jupiter.api.DynamicTest.dynamicTest
-import org.junit.jupiter.api.TestFactory
-import org.junit.jupiter.api.TestInstance
+import io.kotest.core.spec.style.FunSpec
 import prog8.compiler.compileProgram
 import prog8.compiler.target.C64Target
 import prog8.compiler.target.Cx16Target
 import prog8.compilerinterface.ICompilationTarget
-import prog8tests.ast.helpers.assumeDirectory
-import prog8tests.ast.helpers.mapCombinations
-import prog8tests.ast.helpers.outputDir
-import prog8tests.ast.helpers.workingDir
+import prog8tests.ast.helpers.*
 import prog8tests.helpers.assertSuccess
+import java.nio.file.Path
 import kotlin.io.path.absolute
 import kotlin.io.path.exists

@@ -22,41 +17,97 @@ import kotlin.io.path.exists
 * They are not really unit tests, but rather tests of the whole process,
 * from source file loading all the way through to running 64tass.
 */
-// @Disabled("disable to save some time")
-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestCompilerOnExamples {
-    private val examplesDir = assumeDirectory(workingDir, "../examples")

-    private fun makeDynamicCompilerTest(name: String, platform: ICompilationTarget, optimize: Boolean) : DynamicTest {
-        val searchIn = mutableListOf(examplesDir)
-        if (platform == Cx16Target) {
-            searchIn.add(0, assumeDirectory(examplesDir, "cx16"))
-        }
-        val filepath = searchIn
-            .map { it.resolve("$name.p8") }
-            .map { it.normalize().absolute() }
-            .map { workingDir.relativize(it) }
-            .first { it.exists() }
-        val displayName = "${examplesDir.relativize(filepath.absolute())}: ${platform.name}, optimize=$optimize"
-        return dynamicTest(displayName) {
-            compileProgram(
-                filepath,
-                optimize,
-                optimizeFloatExpressions = false,
-                writeAssembly = true,
-                slowCodegenWarnings = false,
-                quietAssembler = true,
-                compilationTarget = platform.name,
-                sourceDirs = listOf(),
-                outputDir
-            ).assertSuccess("; $displayName")
+private val examplesDir = assumeDirectory(workingDir, "../examples")
+
+private fun compileTheThing(filepath: Path, optimize: Boolean, target: ICompilationTarget) = compileProgram(
+    filepath,
+    optimize,
+    optimizeFloatExpressions = true,
+    writeAssembly = true,
+    slowCodegenWarnings = false,
+    quietAssembler = true,
+    compilationTarget = target.name,
+    sourceDirs = listOf(),
+    outputDir
+)
+
+private fun prepareTestFiles(source: String, optimize: Boolean, target: ICompilationTarget): Pair<String, Path> {
+    val searchIn = mutableListOf(examplesDir)
+    if (target == Cx16Target) {
+        searchIn.add(0, assumeDirectory(examplesDir, "cx16"))
+    }
+    val filepath = searchIn
+        .map { it.resolve("$source.p8") }
+        .map { it.normalize().absolute() }
+        .map { workingDir.relativize(it) }
+        .first { it.exists() }
+    val displayName = "${examplesDir.relativize(filepath.absolute())}: ${target.name}, optimize=$optimize"
+    return Pair(displayName, filepath)
+}
+
+
+class TestCompilerOnExamplesC64: FunSpec({
+
+    val onlyC64 = cartesianProduct(
+        listOf(
+            "balloonflight",
+            "bdmusic",
+            "bdmusic-irq",
+            "charset",
+            "cube3d-sprites",
+            "plasma",
+            "sprites",
+            "turtle-gfx",
+            "wizzine",
+        ),
+        listOf(false, true)
+    )
+
+    onlyC64.forEach {
+        val (source, optimize) = it
+        val (displayName, filepath) = prepareTestFiles(source, optimize, C64Target)
+        test(displayName) {
+            compileTheThing(filepath, optimize, C64Target).assertSuccess()
        }
    }
+})

-    @TestFactory
-// @Disabled("disable to save some time")
-    fun bothCx16AndC64() = mapCombinations(
-        dim1 = listOf(
+class TestCompilerOnExamplesCx16: FunSpec({
+
+    val onlyCx16 = cartesianProduct(
+        listOf(
+            "vtui/testvtui",
+            "amiga",
+            "bobs",
+            "cobramk3-gfx",
+            "colorbars",
+            "datetime",
+            "highresbitmap",
+            "kefrenbars",
+            "mandelbrot-gfx-colors",
+            "multipalette",
+            "rasterbars",
+            "sincos",
+            "tehtriz",
+            "testgfx2",
+        ),
+        listOf(false, true)
+    )
+
+    onlyCx16.forEach {
+        val (source, optimize) = it
+        val (displayName, filepath) = prepareTestFiles(source, optimize, Cx16Target)
+        test(displayName) {
+            compileTheThing(filepath, optimize, Cx16Target).assertSuccess()
+        }
+    }
+})
+
+class TestCompilerOnExamplesBothC64andCx16: FunSpec({
+
+    val bothCx16AndC64 = cartesianProduct(
+        listOf(
            "animals",
            "balls",
            "cube3d",
@@ -79,48 +130,18 @@ class TestCompilerOnExamples {
            "tehtriz",
            "textelite",
        ),
-        dim2 = listOf(Cx16Target, C64Target),
-        dim3 = listOf(false, true),
-        combine3 = ::makeDynamicCompilerTest
+        listOf(false, true)
    )

-    @TestFactory
-// @Disabled("disable to save some time")
-    fun onlyC64() = mapCombinations(
-        dim1 = listOf(
-            "balloonflight",
-            "bdmusic",
-            "bdmusic-irq",
-            "charset",
-            "cube3d-sprites",
-            "plasma",
-            "sprites",
-            "turtle-gfx",
-            "wizzine",
-        ),
-        dim2 = listOf(C64Target),
-        dim3 = listOf(false, true),
-        combine3 = ::makeDynamicCompilerTest
-    )
-
-    @TestFactory
-// @Disabled("disable to save some time")
-    fun onlyCx16() = mapCombinations(
-        dim1 = listOf(
-            "vtui/testvtui",
-            "amiga",
-            "bobs",
-            "cobramk3-gfx",
-            "colorbars",
-            "datetime",
-            "highresbitmap",
-            "kefrenbars",
-            "mandelbrot-gfx-colors",
-            "multipalette",
-            "testgfx2",
-        ),
-        dim2 = listOf(Cx16Target),
-        dim3 = listOf(false, true),
-        combine3 = ::makeDynamicCompilerTest
-    )
-}
+    bothCx16AndC64.forEach {
+        val (source, optimize) = it
+        val (displayNameC64, filepathC64) = prepareTestFiles(source, optimize, C64Target)
+        val (displayNameCx16, filepathCx16) = prepareTestFiles(source, optimize, Cx16Target)
+        test(displayNameC64) {
+            compileTheThing(filepathC64, optimize, C64Target).assertSuccess()
+        }
+        test(displayNameCx16) {
+            compileTheThing(filepathCx16, optimize, Cx16Target).assertSuccess()
+        }
+    }
+})
@@ -1,7 +1,9 @@
 package prog8tests

-import org.junit.jupiter.api.*
-import org.junit.jupiter.api.DynamicTest.dynamicTest
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.shouldNotBe
 import prog8.ast.expressions.AddressOf
 import prog8.ast.expressions.IdentifierReference
 import prog8.ast.expressions.StringLiteralValue
@@ -13,8 +15,6 @@ import prog8tests.helpers.assertFailure
 import prog8tests.helpers.assertSuccess
 import prog8tests.helpers.compileFile
 import kotlin.io.path.name
-import kotlin.test.assertEquals
-import kotlin.test.assertNotEquals


 /**
@@ -22,14 +22,11 @@ import kotlin.test.assertNotEquals
 * They are not really unit tests, but rather tests of the whole process,
 * from source file loading all the way through to running 64tass.
 */
-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestCompilerOnImportsAndIncludes {
+class TestCompilerOnImportsAndIncludes: FunSpec({

-    @Nested
-    inner class Import {
+    context("Import") {

-        @Test
-        fun testImportFromSameFolder() {
+        test("testImportFromSameFolder") {
            val filepath = assumeReadableFile(fixturesDir, "importFromSameFolder.p8")
            assumeReadableFile(fixturesDir, "foo_bar.p8")

@@ -44,17 +41,15 @@ class TestCompilerOnImportsAndIncludes {
                .map { it.args[0] as IdentifierReference }
                .map { it.targetVarDecl(program)!!.value as StringLiteralValue }

-            assertEquals("main.bar", strLits[0].value)
-            assertEquals("foo.bar", strLits[1].value)
-            assertEquals("main", strLits[0].definingScope.name)
-            assertEquals("foo", strLits[1].definingScope.name)
+            strLits[0].value shouldBe "main.bar"
+            strLits[1].value shouldBe "foo.bar"
+            strLits[0].definingScope.name shouldBe "main"
+            strLits[1].definingScope.name shouldBe "foo"
        }
    }

-    @Nested
-    inner class AsmInclude {
-        @Test
-        fun testAsmIncludeFromSameFolder() {
+    context("AsmInclude") {
+        test("testAsmIncludeFromSameFolder") {
            val filepath = assumeReadableFile(fixturesDir, "asmIncludeFromSameFolder.p8")
            assumeReadableFile(fixturesDir, "foo_bar.asm")

@@ -69,20 +64,18 @@ class TestCompilerOnImportsAndIncludes {
                .map { it.args[0] }

            val str0 = (args[0] as IdentifierReference).targetVarDecl(program)!!.value as StringLiteralValue
-            assertEquals("main.bar", str0.value)
-            assertEquals("main", str0.definingScope.name)
+            str0.value shouldBe "main.bar"
+            str0.definingScope.name shouldBe "main"

            val id1 = (args[1] as AddressOf).identifier
            val lbl1 = id1.targetStatement(program) as Label
-            assertEquals("foo_bar", lbl1.name)
-            assertEquals("start", lbl1.definingScope.name)
+            lbl1.name shouldBe "foo_bar"
+            lbl1.definingScope.name shouldBe "start"
        }
    }

-    @Nested
-    inner class Asmbinary {
-        @Test
-        fun testAsmbinaryDirectiveWithNonExistingFile() {
+    context("Asmbinary") {
+        test("testAsmbinaryDirectiveWithNonExistingFile") {
            val p8Path = assumeReadableFile(fixturesDir, "asmBinaryNonExisting.p8")
            assumeNotExists(fixturesDir, "i_do_not_exist.bin")

@@ -90,8 +83,7 @@ class TestCompilerOnImportsAndIncludes {
                .assertFailure()
        }

-        @Test
-        fun testAsmbinaryDirectiveWithNonReadableFile() {
+        test("testAsmbinaryDirectiveWithNonReadableFile") {
            val p8Path = assumeReadableFile(fixturesDir, "asmBinaryNonReadable.p8")
            assumeDirectory(fixturesDir, "subFolder")

@@ -99,31 +91,30 @@ class TestCompilerOnImportsAndIncludes {
                .assertFailure()
        }

-        @TestFactory
-        fun asmbinaryDirectiveWithExistingBinFile(): Iterable<DynamicTest> =
-            listOf(
+        val tests = listOf(
                Triple("same ", "asmBinaryFromSameFolder.p8", "do_nothing1.bin"),
                Triple("sub", "asmBinaryFromSubFolder.p8", "subFolder/do_nothing2.bin"),
-            ).map {
-                val (where, p8Str, binStr) = it
-                dynamicTest("%asmbinary from ${where}folder") {
-                    val p8Path = assumeReadableFile(fixturesDir, p8Str)
-                    // val binPath = assumeReadableFile(fixturesDir, binStr)
-                    assertNotEquals( // the bug we're testing for (#54) was hidden if outputDir == workingDir
-                        workingDir.normalize().toAbsolutePath(),
-                        outputDir.normalize().toAbsolutePath(),
-                        "sanity check: workingDir and outputDir should not be the same folder"
-                    )
+            )

-                    compileFile(Cx16Target, false, p8Path.parent, p8Path.name, outputDir)
-                        .assertSuccess(
-                            "argument to assembler directive .binary " +
-                                    "should be relative to the generated .asm file (in output dir), " +
-                                    "NOT relative to .p8 neither current working dir"
-                        )
+        tests.forEach {
+            val (where, p8Str, binStr) = it
+            test("%asmbinary from ${where}folder") {
+                val p8Path = assumeReadableFile(fixturesDir, p8Str)
+                // val binPath = assumeReadableFile(fixturesDir, binStr)
+
+                // the bug we're testing for (#54) was hidden if outputDir == workingDir
+                withClue("sanity check: workingDir and outputDir should not be the same folder") {
+                    outputDir.normalize().toAbsolutePath() shouldNotBe workingDir.normalize().toAbsolutePath()
                }
-            }

+                compileFile(Cx16Target, false, p8Path.parent, p8Path.name, outputDir)
+                    .assertSuccess(
+                        "argument to assembler directive .binary " +
+                                "should be relative to the generated .asm file (in output dir), " +
+                                "NOT relative to .p8 neither current working dir"
+                    )
+            }
+        }
    }

-}
+})
@@ -1,26 +1,23 @@
 package prog8tests

-import org.junit.jupiter.api.DynamicTest.dynamicTest
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestFactory
-import org.junit.jupiter.api.TestInstance
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.string.shouldContain
 import prog8.ast.base.DataType
 import prog8.ast.base.Position
 import prog8.ast.expressions.*
 import prog8.ast.statements.ForLoop
-import prog8.ast.statements.Subroutine
 import prog8.ast.statements.VarDecl
 import prog8.compiler.target.C64Target
 import prog8.compiler.target.Cx16Target
 import prog8.compilerinterface.size
 import prog8.compilerinterface.toConstantIntegerRange
-import prog8tests.ast.helpers.mapCombinations
+import prog8tests.ast.helpers.cartesianProduct
 import prog8tests.helpers.ErrorReporterForTests
 import prog8tests.helpers.assertFailure
 import prog8tests.helpers.assertSuccess
 import prog8tests.helpers.compileText
-import kotlin.test.assertContains
-import kotlin.test.assertEquals


 /**
@@ -28,13 +25,11 @@ import kotlin.test.assertEquals
 * They are not really unit tests, but rather tests of the whole process,
 * from source file loading all the way through to running 64tass.
 */
-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestCompilerOnRanges {
+class TestCompilerOnRanges: FunSpec({

-    @Test
-    fun testUByteArrayInitializerWithRange_char_to_char() {
+    test("testUByteArrayInitializerWithRange_char_to_char") {
        val platform = Cx16Target
-        val result = compileText(platform, true, """
+        val result = compileText(platform, false, """
            main {
                sub start() {
                    ubyte[] cs = @'a' to 'z' ; values are computed at compile time 
@@ -55,12 +50,15 @@ class TestCompilerOnRanges {
        val expectedStr = "$expectedStart .. $expectedEnd"

        val actualStr = "${rhsValues.first()} .. ${rhsValues.last()}"
-        assertEquals(expectedStr, actualStr,".first .. .last")
-        assertEquals(expectedEnd - expectedStart + 1, rhsValues.last() - rhsValues.first() + 1, "rangeExpr.size()")
+        withClue(".first .. .last") {
+            actualStr shouldBe expectedStr
+        }
+        withClue("rangeExpr.size()") {
+            (rhsValues.last() - rhsValues.first() + 1) shouldBe (expectedEnd - expectedStart + 1)
+        }
    }

-    @Test
-    fun testFloatArrayInitializerWithRange_char_to_char() {
+    test("testFloatArrayInitializerWithRange_char_to_char") {
        val platform = C64Target
        val result = compileText(platform, optimize = false, """
            %option enable_floats
@@ -84,50 +82,39 @@ class TestCompilerOnRanges {
        val expectedStr = "$expectedStart .. $expectedEnd"

        val actualStr = "${rhsValues.first()} .. ${rhsValues.last()}"
-        assertEquals(expectedStr, actualStr,".first .. .last")
-        assertEquals(expectedEnd - expectedStart + 1, rhsValues.size, "rangeExpr.size()")
+        withClue(".first .. .last") {
+            actualStr shouldBe expectedStr
+        }
+        withClue("rangeExpr.size()") {
+            rhsValues.size shouldBe (expectedEnd - expectedStart + 1)
+        }
    }

-    fun Subroutine.decl(varName: String): VarDecl {
-        return statements.filterIsInstance<VarDecl>()
-            .first { it.name == varName }
-    }
-    inline fun <reified T : Expression> VarDecl.rhs() : T {
-        return value as T
-    }
-    inline fun <reified T : Expression> ArrayLiteralValue.elements() : List<T> {
-        return value.map { it as T }
-    }
+    context("floatArrayInitializerWithRange") {
+        val combos = cartesianProduct(
+            listOf("", "42", "41"),                 // sizeInDecl
+            listOf("%option enable_floats", ""),    // optEnableFloats
+            listOf(Cx16Target, C64Target),          // platform
+            listOf(false, true)                    // optimize
+        )

-    fun <N : Number> assertEndpoints(expFirst: N, expLast: N, actual: Iterable<N>, msg: String = ".first .. .last") {
-        val expectedStr = "$expFirst .. $expLast"
-        val actualStr = "${actual.first()} .. ${actual.last()}"
-        assertEquals(expectedStr, actualStr,".first .. .last")
-    }
-
-
-    @TestFactory
-    fun floatArrayInitializerWithRange() = mapCombinations(
-        dim1 = listOf("", "42", "41"),                 // sizeInDecl
-        dim2 = listOf("%option enable_floats", ""),    // optEnableFloats
-        dim3 = listOf(Cx16Target, C64Target),          // platform
-        dim4 = listOf(false, true),                    // optimize
-        combine4 = { sizeInDecl, optEnableFloats, platform, optimize ->
+        combos.forEach {
+            val (sizeInDecl, optEnableFloats, platform, optimize) = it
            val displayName =
-                "test failed for: " +
                when (sizeInDecl) {
                    "" -> "no"
                    "42" -> "correct"
                    else -> "wrong"
                } + " array size given" +
-                ", " + (if (optEnableFloats == "") "without" else "with") + " %option enable_floats" +
-                ", ${platform.name}, optimize: $optimize"
-            dynamicTest(displayName) {
+                        ", " + (if (optEnableFloats == "") "without" else "with") + " %option enable_floats" +
+                        ", ${platform.name}, optimize: $optimize"
+
+            test(displayName) {
                val result = compileText(platform, optimize, """
                    $optEnableFloats
                    main {
                        sub start() {
-                            float[$sizeInDecl] cs = 1 to 42 ; values are computed at compile time 
+                            float[$sizeInDecl] cs = 1 to 42 ; values are computed at compile time
                            cs[0] = 23 ; keep optimizer from removing it
                        }
                    }
@@ -136,12 +123,12 @@ class TestCompilerOnRanges {
                    result.assertSuccess()
                else
                    result.assertFailure()
+
            }
        }
-    )
+    }

-    @Test
-    fun testForLoopWithRange_char_to_char() {
+    test("testForLoopWithRange_char_to_char") {
        val platform = Cx16Target
        val result = compileText(platform, optimize = true, """
            main {
@@ -167,12 +154,15 @@ class TestCompilerOnRanges {

        val intProgression = rangeExpr.toConstantIntegerRange()
        val actualStr = "${intProgression?.first} .. ${intProgression?.last}"
-        assertEquals(expectedStr, actualStr,".first .. .last")
-        assertEquals(expectedEnd - expectedStart + 1, rangeExpr.size(), "rangeExpr.size()")
+        withClue(".first .. .last") {
+            actualStr shouldBe expectedStr
+        }
+        withClue("rangeExpr.size()") {
+            rangeExpr.size() shouldBe (expectedEnd - expectedStart + 1)
+        }
    }

-    @Test
-    fun testForLoopWithRange_bool_to_bool() {
+    test("testForLoopWithRange_bool_to_bool") {
        val platform = Cx16Target
        val result = compileText(platform, optimize = true, """
            main {
@@ -192,14 +182,13 @@ class TestCompilerOnRanges {
            .map { it.iterable }
            .filterIsInstance<RangeExpr>()[0]

-        assertEquals(2, rangeExpr.size())
+        rangeExpr.size() shouldBe 2
        val intProgression = rangeExpr.toConstantIntegerRange()
-        assertEquals(0, intProgression?.first)
-        assertEquals(1, intProgression?.last)
+        intProgression?.first shouldBe 0
+        intProgression?.last shouldBe 1
    }

-    @Test
-    fun testForLoopWithRange_ubyte_to_ubyte() {
+    test("testForLoopWithRange_ubyte_to_ubyte") {
        val platform = Cx16Target
        val result = compileText(platform, optimize = true, """
            main {
@@ -219,14 +208,13 @@ class TestCompilerOnRanges {
            .map { it.iterable }
            .filterIsInstance<RangeExpr>()[0]

-        assertEquals(9, rangeExpr.size())
+        rangeExpr.size() shouldBe 9
        val intProgression = rangeExpr.toConstantIntegerRange()
-        assertEquals(1, intProgression?.first)
-        assertEquals(9, intProgression?.last)
+        intProgression?.first shouldBe 1
+        intProgression?.last shouldBe 9
    }

-    @Test
-    fun testForLoopWithRange_str_downto_str() {
+    test("testForLoopWithRange_str_downto_str") {
        val errors = ErrorReporterForTests()
        compileText(Cx16Target, true, """
            main {
@@ -238,13 +226,12 @@ class TestCompilerOnRanges {
                }
            }
        """, errors, false).assertFailure()
-        assertEquals(2, errors.errors.size)
-        assertContains(errors.errors[0], ".p8:5:29: range expression from value must be integer")
-        assertContains(errors.errors[1], ".p8:5:44: range expression to value must be integer")
+        errors.errors.size shouldBe 2
+        errors.errors[0] shouldContain ".p8:5:29: range expression from value must be integer"
+        errors.errors[1] shouldContain ".p8:5:44: range expression to value must be integer"
    }

-    @Test
-    fun testForLoopWithIterable_str() {
+    test("testForLoopWithIterable_str") {
        val result = compileText(Cx16Target, false, """
            main {
                sub start() {
@@ -263,18 +250,16 @@ class TestCompilerOnRanges {
            .map { it.iterable }
            .filterIsInstance<IdentifierReference>()[0]

-        assertEquals(DataType.STR, iterable.inferType(program).getOr(DataType.UNDEFINED))
+        iterable.inferType(program).getOr(DataType.UNDEFINED) shouldBe DataType.STR
    }

-    @Test
-    fun testRangeExprNumericSize() {
+    test("testRangeExprNumericSize") {
        val expr = RangeExpr(
            NumericLiteralValue.optimalInteger(10, Position.DUMMY),
            NumericLiteralValue.optimalInteger(20, Position.DUMMY),
            NumericLiteralValue.optimalInteger(2, Position.DUMMY),
            Position.DUMMY)
-        assertEquals(6, expr.size())
+        expr.size() shouldBe 6
        expr.toConstantIntegerRange()
    }
-}
-
+})
@@ -1,9 +1,6 @@
 package prog8tests

-import org.junit.jupiter.api.AfterAll
-import org.junit.jupiter.api.BeforeAll
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.core.spec.style.FunSpec
 import prog8.compiler.compileProgram
 import prog8.compiler.target.Cx16Target
 import prog8tests.ast.helpers.assumeReadableFile
@@ -22,13 +19,11 @@ import kotlin.io.path.writeText
 * They are not really unit tests, but rather tests of the whole process,
 * from source file loading all the way through to running 64tass.
 */
-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestCompilerOptionSourcedirs {
+class TestCompilerOptionSourcedirs: FunSpec({

-    private lateinit var tempFileInWorkingDir: Path
+    lateinit var tempFileInWorkingDir: Path

-    @BeforeAll
-    fun setUp() {
+    beforeSpec {
        tempFileInWorkingDir = createTempFile(directory = workingDir, prefix = "tmp_", suffix = ".p8")
            .also { it.writeText("""
                main {
@@ -38,12 +33,11 @@ class TestCompilerOptionSourcedirs {
            """)}
    }

-    @AfterAll
-    fun tearDown() {
+    afterSpec {
        tempFileInWorkingDir.deleteExisting()
    }

-    private fun compileFile(filePath: Path, sourceDirs: List<String>) =
+    fun compileFile(filePath: Path, sourceDirs: List<String>) =
        compileProgram(
            filepath = filePath,
            optimize = false,
@@ -56,47 +50,41 @@ class TestCompilerOptionSourcedirs {
            outputDir
        )

-    @Test
-    fun testAbsoluteFilePathInWorkingDir() {
+    test("testAbsoluteFilePathInWorkingDir") {
        val filepath = assumeReadableFile(tempFileInWorkingDir.absolute())
        compileFile(filepath, listOf())
            .assertSuccess()
    }

-    @Test
-    fun testFilePathInWorkingDirRelativeToWorkingDir() {
+    test("testFilePathInWorkingDirRelativeToWorkingDir") {
        val filepath = assumeReadableFile(workingDir.relativize(tempFileInWorkingDir.absolute()))
        compileFile(filepath, listOf())
            .assertSuccess()
    }

-    @Test
-    fun testFilePathInWorkingDirRelativeTo1stInSourcedirs() {
+    test("testFilePathInWorkingDirRelativeTo1stInSourcedirs") {
        val filepath = assumeReadableFile(tempFileInWorkingDir)
        compileFile(filepath.fileName, listOf(workingDir.toString()))
            .assertSuccess()
    }

-    @Test
-    fun testAbsoluteFilePathOutsideWorkingDir() {
+    test("testAbsoluteFilePathOutsideWorkingDir") {
        val filepath = assumeReadableFile(fixturesDir, "simple_main.p8")
        compileFile(filepath.absolute(), listOf())
            .assertSuccess()
    }

-    @Test
-    fun testFilePathOutsideWorkingDirRelativeToWorkingDir() {
+    test("testFilePathOutsideWorkingDirRelativeToWorkingDir") {
        val filepath = workingDir.relativize(assumeReadableFile(fixturesDir, "simple_main.p8").absolute())
        compileFile(filepath, listOf())
            .assertSuccess()
    }

-    @Test
-    fun testFilePathOutsideWorkingDirRelativeTo1stInSourcedirs() {
+    test("testFilePathOutsideWorkingDirRelativeTo1stInSourcedirs") {
        val filepath = assumeReadableFile(fixturesDir, "simple_main.p8")
        val sourcedirs = listOf("$fixturesDir")
        compileFile(filepath.fileName, sourcedirs)
            .assertSuccess()
    }

-}
+})
@@ -1,7 +1,9 @@
 package prog8tests

-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.string.shouldStartWith
 import prog8.ast.internedStringsModuleName
 import prog8.compiler.determineCompilationOptions
 import prog8.compiler.parseImports
@@ -11,15 +13,11 @@ import prog8tests.ast.helpers.outputDir
 import prog8tests.helpers.ErrorReporterForTests
 import prog8tests.helpers.assertSuccess
 import prog8tests.helpers.compileText
-import kotlin.test.assertEquals
-import kotlin.test.assertTrue


-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestImportedModulesOrderAndOptions {
+class TestImportedModulesOrderAndOptions: FunSpec({

-    @Test
-    fun testImportedModuleOrderAndMainModuleCorrect() {
+    test("testImportedModuleOrderAndMainModuleCorrect") {
        val result = compileText(C64Target, false, """
 %import textio
 %import floats
@@ -30,25 +28,27 @@ main {
    }
 }
 """).assertSuccess()
-        assertTrue(result.program.toplevelModule.name.startsWith("on_the_fly_test"))
+        result.program.toplevelModule.name shouldStartWith "on_the_fly_test"

        val moduleNames = result.program.modules.map { it.name }
-        assertTrue(moduleNames[0].startsWith("on_the_fly_test"), "main module must be first")
-        assertEquals(listOf(
-            "prog8_interned_strings",
-            "textio",
-            "syslib",
-            "conv",
-            "floats",
-            "math",
-            "prog8_lib"
-        ), moduleNames.drop(1), "module order in parse tree")
-
-        assertTrue(result.program.toplevelModule.name.startsWith("on_the_fly_test"))
+        withClue("main module must be first") {
+            moduleNames[0] shouldStartWith "on_the_fly_test"
+        }
+        withClue("module order in parse tree") {
+            moduleNames.drop(1) shouldBe listOf(
+                "prog8_interned_strings",
+                "textio",
+                "syslib",
+                "conv",
+                "floats",
+                "math",
+                "prog8_lib"
+            )
+        }
+        result.program.toplevelModule.name shouldStartWith "on_the_fly_test"
    }

-    @Test
-    fun testCompilationOptionsCorrectFromMain() {
+    test("testCompilationOptionsCorrectFromMain") {
        val result = compileText(C64Target, false, """
 %import textio
 %import floats
@@ -61,15 +61,14 @@ main {
    }
 }
 """).assertSuccess()
-        assertTrue(result.program.toplevelModule.name.startsWith("on_the_fly_test"))
+        result.program.toplevelModule.name shouldStartWith "on_the_fly_test"
        val options = determineCompilationOptions(result.program, C64Target)
-        assertTrue(options.floats)
-        assertEquals(ZeropageType.DONTUSE, options.zeropage)
-        assertTrue(options.noSysInit)
+        options.floats shouldBe true
+        options.zeropage shouldBe ZeropageType.DONTUSE
+        options.noSysInit shouldBe true
    }

-    @Test
-    fun testModuleOrderAndCompilationOptionsCorrectWithJustImports() {
+    test("testModuleOrderAndCompilationOptionsCorrectWithJustImports") {
        val errors = ErrorReporterForTests()
        val sourceText = """
 %import textio
@@ -88,17 +87,23 @@ main {
        filepath.toFile().writeText(sourceText)
        val (program, options, importedfiles) = parseImports(filepath, errors, C64Target, emptyList())

-        assertEquals(filenameBase, program.toplevelModule.name)
-        assertEquals(1, importedfiles.size, "all imports other than the test source must have been internal resources library files")
-        assertEquals(listOf(
-            internedStringsModuleName,
-            filenameBase,
-            "textio", "syslib", "conv", "floats", "math", "prog8_lib"
-        ), program.modules.map {it.name}, "module order in parse tree")
-        assertTrue(options.floats)
-        assertEquals(ZeropageType.DONTUSE, options.zeropage, "zeropage option must be correctly taken from main module, not from float module import logic")
-        assertTrue(options.noSysInit)
+        program.toplevelModule.name shouldBe filenameBase
+        withClue("all imports other than the test source must have been internal resources library files") {
+            importedfiles.size shouldBe 1
+        }
+        withClue("module order in parse tree") {
+            program.modules.map { it.name } shouldBe
+                listOf(
+                    internedStringsModuleName,
+                    filenameBase,
+                    "textio", "syslib", "conv", "floats", "math", "prog8_lib"
+                )
+        }
+        options.floats shouldBe true
+        options.noSysInit shouldBe true
+        withClue("zeropage option must be correctly taken from main module, not from float module import logic") {
+            options.zeropage shouldBe ZeropageType.DONTUSE
+        }
    }

-
-}
+})
@@ -1,7 +1,7 @@
 package prog8tests

-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
 import prog8.ast.Module
 import prog8.ast.Program
 import prog8.ast.base.DataType
@@ -18,74 +18,53 @@ import prog8.parser.SourceCode
 import prog8tests.helpers.DummyFunctions
 import prog8tests.helpers.DummyMemsizer
 import prog8tests.helpers.DummyStringEncoder
-import kotlin.test.assertFalse
-import kotlin.test.assertTrue


-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestMemory {
+class TestMemory: FunSpec({

-    @Test
-    fun testInValidRamC64_memory_addresses() {
+    test("testInValidRamC64_memory_addresses") {

        var memexpr = NumericLiteralValue.optimalInteger(0x0000, Position.DUMMY)
        var target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertTrue(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe true

        memexpr = NumericLiteralValue.optimalInteger(0x1000, Position.DUMMY)
        target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertTrue(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe true

        memexpr = NumericLiteralValue.optimalInteger(0x9fff, Position.DUMMY)
        target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertTrue(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe true

        memexpr = NumericLiteralValue.optimalInteger(0xc000, Position.DUMMY)
        target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertTrue(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe true

        memexpr = NumericLiteralValue.optimalInteger(0xcfff, Position.DUMMY)
        target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertTrue(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe true
    }

-    @Test
-    fun testNotInValidRamC64_memory_addresses() {
+    test("testNotInValidRamC64_memory_addresses") {

        var memexpr = NumericLiteralValue.optimalInteger(0xa000, Position.DUMMY)
        var target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertFalse(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe false

        memexpr = NumericLiteralValue.optimalInteger(0xafff, Position.DUMMY)
        target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertFalse(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe false

        memexpr = NumericLiteralValue.optimalInteger(0xd000, Position.DUMMY)
        target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertFalse(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe false

        memexpr = NumericLiteralValue.optimalInteger(0xffff, Position.DUMMY)
        target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertFalse(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe false
    }

-    @Test
-    fun testInValidRamC64_memory_identifiers() {
-        val program = Program("test", DummyFunctions, DummyMemsizer, DummyStringEncoder)
-        var target = createTestProgramForMemoryRefViaVar(program, 0x1000, VarDeclType.VAR)
-
-        assertTrue(target.isInRegularRAMof(C64Target.machine))
-        target = createTestProgramForMemoryRefViaVar(program, 0xd020, VarDeclType.VAR)
-        assertFalse(target.isInRegularRAMof(C64Target.machine))
-        target = createTestProgramForMemoryRefViaVar(program, 0x1000, VarDeclType.CONST)
-        assertTrue(target.isInRegularRAMof(C64Target.machine))
-        target = createTestProgramForMemoryRefViaVar(program, 0xd020, VarDeclType.CONST)
-        assertFalse(target.isInRegularRAMof(C64Target.machine))
-        target = createTestProgramForMemoryRefViaVar(program, 0x1000, VarDeclType.MEMORY)
-        assertFalse(target.isInRegularRAMof(C64Target.machine))
-    }
-
-    private fun createTestProgramForMemoryRefViaVar(program: Program, address: Int, vartype: VarDeclType): AssignTarget {
+    fun createTestProgramForMemoryRefViaVar(program: Program, address: Int, vartype: VarDeclType): AssignTarget {
        val decl = VarDecl(vartype, DataType.BYTE, ZeropageWish.DONTCARE, null, "address", NumericLiteralValue.optimalInteger(address, Position.DUMMY), false, false, false, Position.DUMMY)
        val memexpr = IdentifierReference(listOf("address"), Position.DUMMY)
        val target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
@@ -95,16 +74,28 @@ class TestMemory {
        module.linkIntoProgram(program)
        return target
    }
+    test("testInValidRamC64_memory_identifiers") {
+        val program = Program("test", DummyFunctions, DummyMemsizer, DummyStringEncoder)
+        var target = createTestProgramForMemoryRefViaVar(program, 0x1000, VarDeclType.VAR)

-    @Test
-    fun testInValidRamC64_memory_expression() {
-        val memexpr = PrefixExpression("+", NumericLiteralValue.optimalInteger(0x1000, Position.DUMMY), Position.DUMMY)
-        val target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
-        assertFalse(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe true
+        target = createTestProgramForMemoryRefViaVar(program, 0xd020, VarDeclType.VAR)
+        target.isInRegularRAMof(C64Target.machine) shouldBe false
+        target = createTestProgramForMemoryRefViaVar(program, 0x1000, VarDeclType.CONST)
+        target.isInRegularRAMof(C64Target.machine) shouldBe true
+        target = createTestProgramForMemoryRefViaVar(program, 0xd020, VarDeclType.CONST)
+        target.isInRegularRAMof(C64Target.machine) shouldBe false
+        target = createTestProgramForMemoryRefViaVar(program, 0x1000, VarDeclType.MEMORY)
+        target.isInRegularRAMof(C64Target.machine) shouldBe false
    }

-    @Test
-    fun testInValidRamC64_variable() {
+    test("testInValidRamC64_memory_expression") {
+        val memexpr = PrefixExpression("+", NumericLiteralValue.optimalInteger(0x1000, Position.DUMMY), Position.DUMMY)
+        val target = AssignTarget(null, null, DirectMemoryWrite(memexpr, Position.DUMMY), Position.DUMMY)
+        target.isInRegularRAMof(C64Target.machine) shouldBe false
+    }
+
+    test("testInValidRamC64_variable") {
        val decl = VarDecl(VarDeclType.VAR, DataType.BYTE, ZeropageWish.DONTCARE, null, "address", null, false, false, false, Position.DUMMY)
        val target = AssignTarget(IdentifierReference(listOf("address"), Position.DUMMY), null, null, Position.DUMMY)
        val assignment = Assignment(target, NumericLiteralValue.optimalInteger(0, Position.DUMMY), Position.DUMMY)
@@ -113,11 +104,10 @@ class TestMemory {
        val program = Program("test", DummyFunctions, DummyMemsizer, DummyStringEncoder)
            .addModule(module)
        module.linkIntoProgram(program)
-        assertTrue(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe true
    }

-    @Test
-    fun testInValidRamC64_memmap_variable() {
+    test("testInValidRamC64_memmap_variable") {
        val address = 0x1000
        val decl = VarDecl(VarDeclType.MEMORY, DataType.UBYTE, ZeropageWish.DONTCARE, null, "address", NumericLiteralValue.optimalInteger(address, Position.DUMMY), false, false, false, Position.DUMMY)
        val target = AssignTarget(IdentifierReference(listOf("address"), Position.DUMMY), null, null, Position.DUMMY)
@@ -127,11 +117,10 @@ class TestMemory {
        val program = Program("test", DummyFunctions, DummyMemsizer, DummyStringEncoder)
            .addModule(module)
        module.linkIntoProgram(program)
-        assertTrue(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe true
    }

-    @Test
-    fun testNotInValidRamC64_memmap_variable() {
+    test("testNotInValidRamC64_memmap_variable") {
        val address = 0xd020
        val decl = VarDecl(VarDeclType.MEMORY, DataType.UBYTE, ZeropageWish.DONTCARE, null, "address", NumericLiteralValue.optimalInteger(address, Position.DUMMY), false, false, false, Position.DUMMY)
        val target = AssignTarget(IdentifierReference(listOf("address"), Position.DUMMY), null, null, Position.DUMMY)
@@ -141,11 +130,10 @@ class TestMemory {
        val program = Program("test", DummyFunctions, DummyMemsizer, DummyStringEncoder)
            .addModule(module)
        module.linkIntoProgram(program)
-        assertFalse(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe false
    }

-    @Test
-    fun testInValidRamC64_array() {
+    test("testInValidRamC64_array") {
        val decl = VarDecl(VarDeclType.VAR, DataType.ARRAY_UB, ZeropageWish.DONTCARE, null, "address", null, false, false, false, Position.DUMMY)
        val arrayindexed = ArrayIndexedExpression(IdentifierReference(listOf("address"), Position.DUMMY), ArrayIndex(NumericLiteralValue.optimalInteger(1, Position.DUMMY), Position.DUMMY), Position.DUMMY)
        val target = AssignTarget(null, arrayindexed, null, Position.DUMMY)
@@ -155,11 +143,10 @@ class TestMemory {
        val program = Program("test", DummyFunctions, DummyMemsizer, DummyStringEncoder)
            .addModule(module)
        module.linkIntoProgram(program)
-        assertTrue(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe true
    }

-    @Test
-    fun testInValidRamC64_array_memmapped() {
+    test("testInValidRamC64_array_memmapped") {
        val address = 0x1000
        val decl = VarDecl(VarDeclType.MEMORY, DataType.ARRAY_UB, ZeropageWish.DONTCARE, null, "address", NumericLiteralValue.optimalInteger(address, Position.DUMMY), false, false, false, Position.DUMMY)
        val arrayindexed = ArrayIndexedExpression(IdentifierReference(listOf("address"), Position.DUMMY), ArrayIndex(NumericLiteralValue.optimalInteger(1, Position.DUMMY), Position.DUMMY), Position.DUMMY)
@@ -170,11 +157,10 @@ class TestMemory {
        val program = Program("test", DummyFunctions, DummyMemsizer, DummyStringEncoder)
            .addModule(module)
        module.linkIntoProgram(program)
-        assertTrue(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe true
    }

-    @Test
-    fun testNotValidRamC64_array_memmapped() {
+    test("testNotValidRamC64_array_memmapped") {
        val address = 0xe000
        val decl = VarDecl(VarDeclType.MEMORY, DataType.ARRAY_UB, ZeropageWish.DONTCARE, null, "address", NumericLiteralValue.optimalInteger(address, Position.DUMMY), false, false, false, Position.DUMMY)
        val arrayindexed = ArrayIndexedExpression(IdentifierReference(listOf("address"), Position.DUMMY), ArrayIndex(NumericLiteralValue.optimalInteger(1, Position.DUMMY), Position.DUMMY), Position.DUMMY)
@@ -185,6 +171,6 @@ class TestMemory {
        val program = Program("test", DummyFunctions, DummyMemsizer, DummyStringEncoder)
            .addModule(module)
        module.linkIntoProgram(program)
-        assertFalse(target.isInRegularRAMof(C64Target.machine))
+        target.isInRegularRAMof(C64Target.machine) shouldBe false
    }
-}
+})
@@ -1,116 +1,110 @@
 package prog8tests

-import org.hamcrest.MatcherAssert.assertThat
-import org.hamcrest.Matchers.closeTo
-import org.hamcrest.Matchers.equalTo
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.doubles.plusOrMinus
+import io.kotest.matchers.shouldBe
 import prog8.ast.toHex
 import prog8.compiler.target.c64.C64MachineDefinition.FLOAT_MAX_NEGATIVE
 import prog8.compiler.target.c64.C64MachineDefinition.FLOAT_MAX_POSITIVE
 import prog8.compiler.target.c64.C64MachineDefinition.Mflpt5
 import prog8.compilerinterface.InternalCompilerException
-import kotlin.test.assertEquals
-import kotlin.test.assertFailsWith

-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestNumbers {
-    @Test
-    fun testToHex() {
-        assertEquals("0", 0.toHex())
-        assertEquals("1", 1.toHex())
-        assertEquals("1", 1.234.toHex())
-        assertEquals("10", 10.toHex())
-        assertEquals("10", 10.99.toHex())
-        assertEquals("15", 15.toHex())
-        assertEquals("\$10", 16.toHex())
-        assertEquals("\$ff", 255.toHex())
-        assertEquals("\$0100", 256.toHex())
-        assertEquals("\$4e5c", 20060.toHex())
-        assertEquals("\$c382", 50050.toHex())
-        assertEquals("\$ffff", 65535.toHex())
-        assertEquals("\$ffff", 65535L.toHex())
-        assertEquals("0", 0.toHex())
-        assertEquals("-1", (-1).toHex())
-        assertEquals("-1", (-1.234).toHex())
-        assertEquals("-10", (-10).toHex())
-        assertEquals("-10", (-10.99).toHex())
-        assertEquals("-15", (-15).toHex())
-        assertEquals("-\$10", (-16).toHex())
-        assertEquals("-\$ff", (-255).toHex())
-        assertEquals("-\$0100", (-256).toHex())
-        assertEquals("-\$4e5c", (-20060).toHex())
-        assertEquals("-\$c382", (-50050).toHex())
-        assertEquals("-\$ffff", (-65535).toHex())
-        assertEquals("-\$ffff", (-65535L).toHex())
-        assertFailsWith<IllegalArgumentException> { 65536.toHex()  }
-        assertFailsWith<IllegalArgumentException> { 65536L.toHex()  }
+
+class TestNumbers: FunSpec({
+    test("testToHex") {
+        0.toHex() shouldBe "0"
+        1.toHex() shouldBe "1"
+        1.234.toHex() shouldBe "1"
+        10.toHex() shouldBe "10"
+        10.99.toHex() shouldBe "10"
+        15.toHex() shouldBe "15"
+        16.toHex() shouldBe "\$10"
+        255.toHex() shouldBe "\$ff"
+        256.toHex() shouldBe "\$0100"
+        20060.toHex() shouldBe "\$4e5c"
+        50050.toHex() shouldBe "\$c382"
+        65535.toHex() shouldBe "\$ffff"
+        65535L.toHex() shouldBe "\$ffff"
+        0.toHex() shouldBe "0"
+        (-1).toHex() shouldBe "-1"
+        (-1.234).toHex() shouldBe "-1"
+        (-10).toHex() shouldBe "-10"
+        (-10.99).toHex() shouldBe "-10"
+        (-15).toHex() shouldBe "-15"
+        (-16).toHex() shouldBe "-\$10"
+        (-255).toHex() shouldBe "-\$ff"
+        (-256).toHex() shouldBe "-\$0100"
+        (-20060).toHex() shouldBe "-\$4e5c"
+        (-50050).toHex() shouldBe "-\$c382"
+        (-65535).toHex() shouldBe "-\$ffff"
+        (-65535L).toHex() shouldBe "-\$ffff"
+        shouldThrow<IllegalArgumentException> { 65536.toHex()  }
+        shouldThrow<IllegalArgumentException> { 65536L.toHex()  }
    }

-    @Test
-    fun testFloatToMflpt5() {
-        assertThat(Mflpt5.fromNumber(0), equalTo(Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00)))
-        assertThat(Mflpt5.fromNumber(3.141592653), equalTo(Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA1)))
-        assertThat(Mflpt5.fromNumber(3.141592653589793), equalTo(Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA2)))
-        assertThat(Mflpt5.fromNumber(32768), equalTo(Mflpt5(0x90, 0x00, 0x00, 0x00, 0x00)))
-        assertThat(Mflpt5.fromNumber(-32768), equalTo(Mflpt5(0x90, 0x80, 0x00, 0x00, 0x00)))
-        assertThat(Mflpt5.fromNumber(1), equalTo(Mflpt5(0x81, 0x00, 0x00, 0x00, 0x00)))
-        assertThat(Mflpt5.fromNumber(0.7071067812), equalTo(Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x34)))
-        assertThat(Mflpt5.fromNumber(0.7071067811865476), equalTo(Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x33)))
-        assertThat(Mflpt5.fromNumber(1.4142135624), equalTo(Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x34)))
-        assertThat(Mflpt5.fromNumber(1.4142135623730951), equalTo(Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x33)))
-        assertThat(Mflpt5.fromNumber(-.5), equalTo(Mflpt5(0x80, 0x80, 0x00, 0x00, 0x00)))
-        assertThat(Mflpt5.fromNumber(0.69314718061), equalTo(Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF8)))
-        assertThat(Mflpt5.fromNumber(0.6931471805599453), equalTo(Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF7)))
-        assertThat(Mflpt5.fromNumber(10), equalTo(Mflpt5(0x84, 0x20, 0x00, 0x00, 0x00)))
-        assertThat(Mflpt5.fromNumber(1000000000), equalTo(Mflpt5(0x9E, 0x6E, 0x6B, 0x28, 0x00)))
-        assertThat(Mflpt5.fromNumber(.5), equalTo(Mflpt5(0x80, 0x00, 0x00, 0x00, 0x00)))
-        assertThat(Mflpt5.fromNumber(1.4426950408889634), equalTo(Mflpt5(0x81, 0x38, 0xAA, 0x3B, 0x29)))
-        assertThat(Mflpt5.fromNumber(1.5707963267948966), equalTo(Mflpt5(0x81, 0x49, 0x0F, 0xDA, 0xA2)))
-        assertThat(Mflpt5.fromNumber(6.283185307179586), equalTo(Mflpt5(0x83, 0x49, 0x0F, 0xDA, 0xA2)))
-        assertThat(Mflpt5.fromNumber(.25), equalTo(Mflpt5(0x7F, 0x00, 0x00, 0x00, 0x00)))
-        assertThat(Mflpt5.fromNumber(123.45678e22), equalTo(Mflpt5(0xd1, 0x02, 0xb7, 0x06, 0xfb)))
-        assertThat(Mflpt5.fromNumber(-123.45678e-22), equalTo(Mflpt5(0x3e, 0xe9, 0x34, 0x09, 0x1b)))
+    test("testFloatToMflpt5") {
+        Mflpt5.fromNumber(0) shouldBe Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00)
+        Mflpt5.fromNumber(3.141592653) shouldBe Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA1)
+        Mflpt5.fromNumber(3.141592653589793) shouldBe Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA2)
+        Mflpt5.fromNumber(32768) shouldBe Mflpt5(0x90, 0x00, 0x00, 0x00, 0x00)
+        Mflpt5.fromNumber(-32768) shouldBe Mflpt5(0x90, 0x80, 0x00, 0x00, 0x00)
+        Mflpt5.fromNumber(1) shouldBe Mflpt5(0x81, 0x00, 0x00, 0x00, 0x00)
+        Mflpt5.fromNumber(0.7071067812) shouldBe Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x34)
+        Mflpt5.fromNumber(0.7071067811865476) shouldBe Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x33)
+        Mflpt5.fromNumber(1.4142135624) shouldBe Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x34)
+        Mflpt5.fromNumber(1.4142135623730951) shouldBe Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x33)
+        Mflpt5.fromNumber(-.5) shouldBe Mflpt5(0x80, 0x80, 0x00, 0x00, 0x00)
+        Mflpt5.fromNumber(0.69314718061) shouldBe Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF8)
+        Mflpt5.fromNumber(0.6931471805599453) shouldBe Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF7)
+        Mflpt5.fromNumber(10) shouldBe Mflpt5(0x84, 0x20, 0x00, 0x00, 0x00)
+        Mflpt5.fromNumber(1000000000) shouldBe Mflpt5(0x9E, 0x6E, 0x6B, 0x28, 0x00)
+        Mflpt5.fromNumber(.5) shouldBe Mflpt5(0x80, 0x00, 0x00, 0x00, 0x00)
+        Mflpt5.fromNumber(1.4426950408889634) shouldBe Mflpt5(0x81, 0x38, 0xAA, 0x3B, 0x29)
+        Mflpt5.fromNumber(1.5707963267948966) shouldBe Mflpt5(0x81, 0x49, 0x0F, 0xDA, 0xA2)
+        Mflpt5.fromNumber(6.283185307179586) shouldBe Mflpt5(0x83, 0x49, 0x0F, 0xDA, 0xA2)
+        Mflpt5.fromNumber(.25) shouldBe Mflpt5(0x7F, 0x00, 0x00, 0x00, 0x00)
+        Mflpt5.fromNumber(123.45678e22) shouldBe Mflpt5(0xd1, 0x02, 0xb7, 0x06, 0xfb)
+        Mflpt5.fromNumber(-123.45678e-22) shouldBe Mflpt5(0x3e, 0xe9, 0x34, 0x09, 0x1b)
    }

-    @Test
-    fun testFloatRange() {
-        assertThat(Mflpt5.fromNumber(FLOAT_MAX_POSITIVE), equalTo(Mflpt5(0xff, 0x7f, 0xff, 0xff, 0xff)))
-        assertThat(Mflpt5.fromNumber(FLOAT_MAX_NEGATIVE), equalTo(Mflpt5(0xff, 0xff, 0xff, 0xff, 0xff)))
-        assertThat(Mflpt5.fromNumber(1.7e-38), equalTo(Mflpt5(0x03, 0x39, 0x1d, 0x15, 0x63)))
-        assertThat(Mflpt5.fromNumber(1.7e-39), equalTo(Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00)))
-        assertThat(Mflpt5.fromNumber(-1.7e-38), equalTo(Mflpt5(0x03, 0xb9, 0x1d, 0x15, 0x63)))
-        assertThat(Mflpt5.fromNumber(-1.7e-39), equalTo(Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00)))
-        assertFailsWith<InternalCompilerException> { Mflpt5.fromNumber(1.7014118346e+38) }
-        assertFailsWith<InternalCompilerException> { Mflpt5.fromNumber(-1.7014118346e+38) }
-        assertFailsWith<InternalCompilerException> { Mflpt5.fromNumber(1.7014118347e+38) }
-        assertFailsWith<InternalCompilerException> { Mflpt5.fromNumber(-1.7014118347e+38) }
+    test("testFloatRange") {
+        Mflpt5.fromNumber(FLOAT_MAX_POSITIVE) shouldBe Mflpt5(0xff, 0x7f, 0xff, 0xff, 0xff)
+        Mflpt5.fromNumber(FLOAT_MAX_NEGATIVE) shouldBe Mflpt5(0xff, 0xff, 0xff, 0xff, 0xff)
+        Mflpt5.fromNumber(1.7e-38) shouldBe Mflpt5(0x03, 0x39, 0x1d, 0x15, 0x63)
+        Mflpt5.fromNumber(1.7e-39) shouldBe Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00)
+        Mflpt5.fromNumber(-1.7e-38) shouldBe Mflpt5(0x03, 0xb9, 0x1d, 0x15, 0x63)
+        Mflpt5.fromNumber(-1.7e-39) shouldBe Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00)
+        shouldThrow<InternalCompilerException> { Mflpt5.fromNumber(1.7014118346e+38) }
+        shouldThrow<InternalCompilerException> { Mflpt5.fromNumber(-1.7014118346e+38) }
+        shouldThrow<InternalCompilerException> { Mflpt5.fromNumber(1.7014118347e+38) }
+        shouldThrow<InternalCompilerException> { Mflpt5.fromNumber(-1.7014118347e+38) }
    }

-    @Test
-    fun testMflpt5ToFloat() {
+    test("testMflpt5ToFloat") {
        val epsilon=0.000000001
-        assertThat(Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00).toDouble(), equalTo(0.0))
-        assertThat(Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA1).toDouble(), closeTo(3.141592653, epsilon))
-        assertThat(Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA2).toDouble(), closeTo(3.141592653589793, epsilon))
-        assertThat(Mflpt5(0x90, 0x00, 0x00, 0x00, 0x00).toDouble(), equalTo(32768.0))
-        assertThat(Mflpt5(0x90, 0x80, 0x00, 0x00, 0x00).toDouble(), equalTo(-32768.0))
-        assertThat(Mflpt5(0x81, 0x00, 0x00, 0x00, 0x00).toDouble(), equalTo(1.0))
-        assertThat(Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x34).toDouble(), closeTo(0.7071067812, epsilon))
-        assertThat(Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x33).toDouble(), closeTo(0.7071067811865476, epsilon))
-        assertThat(Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x34).toDouble(), closeTo(1.4142135624, epsilon))
-        assertThat(Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x33).toDouble(), closeTo(1.4142135623730951, epsilon))
-        assertThat(Mflpt5(0x80, 0x80, 0x00, 0x00, 0x00).toDouble(), equalTo(-.5))
-        assertThat(Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF8).toDouble(), closeTo(0.69314718061, epsilon))
-        assertThat(Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF7).toDouble(), closeTo(0.6931471805599453, epsilon))
-        assertThat(Mflpt5(0x84, 0x20, 0x00, 0x00, 0x00).toDouble(), equalTo(10.0))
-        assertThat(Mflpt5(0x9E, 0x6E, 0x6B, 0x28, 0x00).toDouble(), equalTo(1000000000.0))
-        assertThat(Mflpt5(0x80, 0x00, 0x00, 0x00, 0x00).toDouble(), equalTo(.5))
-        assertThat(Mflpt5(0x81, 0x38, 0xAA, 0x3B, 0x29).toDouble(), closeTo(1.4426950408889634, epsilon))
-        assertThat(Mflpt5(0x81, 0x49, 0x0F, 0xDA, 0xA2).toDouble(), closeTo(1.5707963267948966, epsilon))
-        assertThat(Mflpt5(0x83, 0x49, 0x0F, 0xDA, 0xA2).toDouble(), closeTo(6.283185307179586, epsilon))
-        assertThat(Mflpt5(0x7F, 0x00, 0x00, 0x00, 0x00).toDouble(), equalTo(.25))
-        assertThat(Mflpt5(0xd1, 0x02, 0xb7, 0x06, 0xfb).toDouble(), closeTo(123.45678e22, 1.0e15))
-        assertThat(Mflpt5(0x3e, 0xe9, 0x34, 0x09, 0x1b).toDouble(), closeTo(-123.45678e-22, epsilon))
+
+        Mflpt5(0x00, 0x00, 0x00, 0x00, 0x00).toDouble() shouldBe 0.0
+        Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA1).toDouble() shouldBe(3.141592653 plusOrMinus epsilon)
+        Mflpt5(0x82, 0x49, 0x0F, 0xDA, 0xA2).toDouble() shouldBe(3.141592653589793 plusOrMinus epsilon)
+        Mflpt5(0x90, 0x00, 0x00, 0x00, 0x00).toDouble() shouldBe 32768.0
+        Mflpt5(0x90, 0x80, 0x00, 0x00, 0x00).toDouble() shouldBe -32768.0
+        Mflpt5(0x81, 0x00, 0x00, 0x00, 0x00).toDouble() shouldBe 1.0
+        Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x34).toDouble() shouldBe(0.7071067812 plusOrMinus epsilon)
+        Mflpt5(0x80, 0x35, 0x04, 0xF3, 0x33).toDouble() shouldBe(0.7071067811865476 plusOrMinus epsilon)
+        Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x34).toDouble() shouldBe(1.4142135624 plusOrMinus epsilon)
+        Mflpt5(0x81, 0x35, 0x04, 0xF3, 0x33).toDouble() shouldBe(1.4142135623730951 plusOrMinus epsilon)
+        Mflpt5(0x80, 0x80, 0x00, 0x00, 0x00).toDouble() shouldBe -.5
+        Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF8).toDouble() shouldBe(0.69314718061 plusOrMinus epsilon)
+        Mflpt5(0x80, 0x31, 0x72, 0x17, 0xF7).toDouble() shouldBe(0.6931471805599453 plusOrMinus epsilon)
+        Mflpt5(0x84, 0x20, 0x00, 0x00, 0x00).toDouble() shouldBe 10.0
+        Mflpt5(0x9E, 0x6E, 0x6B, 0x28, 0x00).toDouble() shouldBe 1000000000.0
+        Mflpt5(0x80, 0x00, 0x00, 0x00, 0x00).toDouble() shouldBe .5
+        Mflpt5(0x81, 0x38, 0xAA, 0x3B, 0x29).toDouble() shouldBe(1.4426950408889634 plusOrMinus epsilon)
+        Mflpt5(0x81, 0x49, 0x0F, 0xDA, 0xA2).toDouble() shouldBe(1.5707963267948966 plusOrMinus epsilon)
+        Mflpt5(0x83, 0x49, 0x0F, 0xDA, 0xA2).toDouble() shouldBe(6.283185307179586 plusOrMinus epsilon)
+        Mflpt5(0x7F, 0x00, 0x00, 0x00, 0x00).toDouble() shouldBe .25
+        Mflpt5(0xd1, 0x02, 0xb7, 0x06, 0xfb).toDouble() shouldBe(123.45678e22 plusOrMinus 1.0e15)
+        Mflpt5(0x3e, 0xe9, 0x34, 0x09, 0x1b).toDouble() shouldBe(-123.45678e-22 plusOrMinus epsilon)
    }
-}
+})
@@ -1,92 +1,85 @@
 package prog8tests

-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.shouldNotBe
 import prog8.ast.base.DataType
 import prog8.ast.base.Position
 import prog8.ast.expressions.ArrayLiteralValue
 import prog8.ast.expressions.InferredTypes
 import prog8.ast.expressions.NumericLiteralValue
 import prog8.ast.expressions.StringLiteralValue
-import kotlin.test.assertEquals
-import kotlin.test.assertFalse
-import kotlin.test.assertNotEquals
-import kotlin.test.assertTrue

-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestNumericLiteralValue {
+class TestNumericLiteralValue: FunSpec({

-    private fun sameValueAndType(lv1: NumericLiteralValue, lv2: NumericLiteralValue): Boolean {
+    fun sameValueAndType(lv1: NumericLiteralValue, lv2: NumericLiteralValue): Boolean {
        return lv1.type==lv2.type && lv1==lv2
    }

-    private val dummyPos = Position("test", 0, 0, 0)
+    val dummyPos = Position("test", 0, 0, 0)

-    @Test
-    fun testIdentity() {
+    test("testIdentity") {
        val v = NumericLiteralValue(DataType.UWORD, 12345, dummyPos)
-        assertEquals(v, v)
-        assertFalse(v != v)
-        assertTrue(v <= v)
-        assertTrue(v >= v)
-        assertFalse(v < v)
-        assertFalse(v > v)
+        (v==v) shouldBe true
+        (v != v) shouldBe false
+        (v <= v) shouldBe true
+        (v >= v) shouldBe true
+        (v < v ) shouldBe false
+        (v > v ) shouldBe false

-        assertTrue(sameValueAndType(NumericLiteralValue(DataType.UWORD, 12345, dummyPos), NumericLiteralValue(DataType.UWORD, 12345, dummyPos)))
+        sameValueAndType(NumericLiteralValue(DataType.UWORD, 12345, dummyPos), NumericLiteralValue(DataType.UWORD, 12345, dummyPos)) shouldBe true
    }

-    @Test
-    fun testEqualsAndNotEquals() {
-        assertEquals(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.UBYTE, 100, dummyPos))
-        assertEquals(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.UWORD, 100, dummyPos))
-        assertEquals(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos))
-        assertEquals(NumericLiteralValue(DataType.UWORD, 254, dummyPos), NumericLiteralValue(DataType.UBYTE, 254, dummyPos))
-        assertEquals(NumericLiteralValue(DataType.UWORD, 12345, dummyPos), NumericLiteralValue(DataType.UWORD, 12345, dummyPos))
-        assertEquals(NumericLiteralValue(DataType.UWORD, 12345, dummyPos), NumericLiteralValue(DataType.FLOAT, 12345.0, dummyPos))
-        assertEquals(NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos), NumericLiteralValue(DataType.UBYTE, 100, dummyPos))
-        assertEquals(NumericLiteralValue(DataType.FLOAT, 22239.0, dummyPos), NumericLiteralValue(DataType.UWORD, 22239, dummyPos))
-        assertEquals(NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos), NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos))
+    test("testEqualsAndNotEquals") {
+        (NumericLiteralValue(DataType.UBYTE, 100, dummyPos) == NumericLiteralValue(DataType.UBYTE, 100, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.UBYTE, 100, dummyPos) == NumericLiteralValue(DataType.UWORD, 100, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.UBYTE, 100, dummyPos) == NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.UWORD, 254, dummyPos) == NumericLiteralValue(DataType.UBYTE, 254, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.UWORD, 12345, dummyPos) == NumericLiteralValue(DataType.UWORD, 12345, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.UWORD, 12345, dummyPos) == NumericLiteralValue(DataType.FLOAT, 12345.0, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) == NumericLiteralValue(DataType.UBYTE, 100, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.FLOAT, 22239.0, dummyPos) == NumericLiteralValue(DataType.UWORD, 22239, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos) == NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos)) shouldBe true

-        assertTrue(sameValueAndType(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.UBYTE, 100, dummyPos)))
-        assertFalse(sameValueAndType(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.UWORD, 100, dummyPos)))
-        assertFalse(sameValueAndType(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos)))
-        assertFalse(sameValueAndType(NumericLiteralValue(DataType.UWORD, 254, dummyPos), NumericLiteralValue(DataType.UBYTE, 254, dummyPos)))
-        assertTrue(sameValueAndType(NumericLiteralValue(DataType.UWORD, 12345, dummyPos), NumericLiteralValue(DataType.UWORD, 12345, dummyPos)))
-        assertFalse(sameValueAndType(NumericLiteralValue(DataType.UWORD, 12345, dummyPos), NumericLiteralValue(DataType.FLOAT, 12345.0, dummyPos)))
-        assertFalse(sameValueAndType(NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos), NumericLiteralValue(DataType.UBYTE, 100, dummyPos)))
-        assertFalse(sameValueAndType(NumericLiteralValue(DataType.FLOAT, 22239.0, dummyPos), NumericLiteralValue(DataType.UWORD, 22239, dummyPos)))
-        assertTrue(sameValueAndType(NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos), NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos)))
+        sameValueAndType(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.UBYTE, 100, dummyPos)) shouldBe true
+        sameValueAndType(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.UWORD, 100, dummyPos)) shouldBe false
+        sameValueAndType(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos)) shouldBe false
+        sameValueAndType(NumericLiteralValue(DataType.UWORD, 254, dummyPos), NumericLiteralValue(DataType.UBYTE, 254, dummyPos)) shouldBe false
+        sameValueAndType(NumericLiteralValue(DataType.UWORD, 12345, dummyPos), NumericLiteralValue(DataType.UWORD, 12345, dummyPos)) shouldBe true
+        sameValueAndType(NumericLiteralValue(DataType.UWORD, 12345, dummyPos), NumericLiteralValue(DataType.FLOAT, 12345.0, dummyPos)) shouldBe false
+        sameValueAndType(NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos), NumericLiteralValue(DataType.UBYTE, 100, dummyPos)) shouldBe false
+        sameValueAndType(NumericLiteralValue(DataType.FLOAT, 22239.0, dummyPos), NumericLiteralValue(DataType.UWORD, 22239, dummyPos)) shouldBe false
+        sameValueAndType(NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos), NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos)) shouldBe true

-        assertNotEquals(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.UBYTE, 101, dummyPos))
-        assertNotEquals(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.UWORD, 101, dummyPos))
-        assertNotEquals(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.FLOAT, 101.0, dummyPos))
-        assertNotEquals(NumericLiteralValue(DataType.UWORD, 245, dummyPos), NumericLiteralValue(DataType.UBYTE, 246, dummyPos))
-        assertNotEquals(NumericLiteralValue(DataType.UWORD, 12345, dummyPos), NumericLiteralValue(DataType.UWORD, 12346, dummyPos))
-        assertNotEquals(NumericLiteralValue(DataType.UWORD, 12345, dummyPos), NumericLiteralValue(DataType.FLOAT, 12346.0, dummyPos))
-        assertNotEquals(NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos), NumericLiteralValue(DataType.UBYTE, 9, dummyPos))
-        assertNotEquals(NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos), NumericLiteralValue(DataType.UWORD, 9, dummyPos))
-        assertNotEquals(NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos), NumericLiteralValue(DataType.FLOAT, 9.0, dummyPos))
+        (NumericLiteralValue(DataType.UBYTE, 100, dummyPos) != NumericLiteralValue(DataType.UBYTE, 101, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.UBYTE, 100, dummyPos) != NumericLiteralValue(DataType.UWORD, 101, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.UBYTE, 100, dummyPos) != NumericLiteralValue(DataType.FLOAT, 101.0, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.UWORD, 245, dummyPos) != NumericLiteralValue(DataType.UBYTE, 246, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.UWORD, 12345, dummyPos) != NumericLiteralValue(DataType.UWORD, 12346, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.UWORD, 12345, dummyPos) != NumericLiteralValue(DataType.FLOAT, 12346.0, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos) != NumericLiteralValue(DataType.UBYTE, 9, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos) != NumericLiteralValue(DataType.UWORD, 9, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos) != NumericLiteralValue(DataType.FLOAT, 9.0, dummyPos)) shouldBe true

-        assertFalse(sameValueAndType(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.UBYTE, 101, dummyPos)))
-        assertFalse(sameValueAndType(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.UWORD, 101, dummyPos)))
-        assertFalse(sameValueAndType(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.FLOAT, 101.0, dummyPos)))
-        assertFalse(sameValueAndType(NumericLiteralValue(DataType.UWORD, 245, dummyPos), NumericLiteralValue(DataType.UBYTE, 246, dummyPos)))
-        assertFalse(sameValueAndType(NumericLiteralValue(DataType.UWORD, 12345, dummyPos), NumericLiteralValue(DataType.UWORD, 12346, dummyPos)))
-        assertFalse(sameValueAndType(NumericLiteralValue(DataType.UWORD, 12345, dummyPos), NumericLiteralValue(DataType.FLOAT, 12346.0, dummyPos)))
-        assertFalse(sameValueAndType(NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos), NumericLiteralValue(DataType.UBYTE, 9, dummyPos)))
-        assertFalse(sameValueAndType(NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos), NumericLiteralValue(DataType.UWORD, 9, dummyPos)))
-        assertFalse(sameValueAndType(NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos), NumericLiteralValue(DataType.FLOAT, 9.0, dummyPos)))
+        sameValueAndType(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.UBYTE, 101, dummyPos)) shouldBe false
+        sameValueAndType(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.UWORD, 101, dummyPos)) shouldBe false
+        sameValueAndType(NumericLiteralValue(DataType.UBYTE, 100, dummyPos), NumericLiteralValue(DataType.FLOAT, 101.0, dummyPos)) shouldBe false
+        sameValueAndType(NumericLiteralValue(DataType.UWORD, 245, dummyPos), NumericLiteralValue(DataType.UBYTE, 246, dummyPos)) shouldBe false
+        sameValueAndType(NumericLiteralValue(DataType.UWORD, 12345, dummyPos), NumericLiteralValue(DataType.UWORD, 12346, dummyPos)) shouldBe false
+        sameValueAndType(NumericLiteralValue(DataType.UWORD, 12345, dummyPos), NumericLiteralValue(DataType.FLOAT, 12346.0, dummyPos)) shouldBe false
+        sameValueAndType(NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos), NumericLiteralValue(DataType.UBYTE, 9, dummyPos)) shouldBe false
+        sameValueAndType(NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos), NumericLiteralValue(DataType.UWORD, 9, dummyPos)) shouldBe false
+        sameValueAndType(NumericLiteralValue(DataType.FLOAT, 9.99, dummyPos), NumericLiteralValue(DataType.FLOAT, 9.0, dummyPos)) shouldBe false


    }

-    @Test
-    fun testEqualsRef() {
-        assertEquals(StringLiteralValue("hello", false, dummyPos), StringLiteralValue("hello", false, dummyPos))
-        assertNotEquals(StringLiteralValue("hello", false, dummyPos), StringLiteralValue("bye", false, dummyPos))
-        assertEquals(StringLiteralValue("hello", true, dummyPos), StringLiteralValue("hello", true, dummyPos))
-        assertNotEquals(StringLiteralValue("hello", true, dummyPos), StringLiteralValue("bye", true, dummyPos))
-        assertNotEquals(StringLiteralValue("hello", true, dummyPos), StringLiteralValue("hello", false, dummyPos))
+    test("testEqualsRef") {
+        (StringLiteralValue("hello", false, dummyPos) == StringLiteralValue("hello", false, dummyPos)) shouldBe true
+        (StringLiteralValue("hello", false, dummyPos) != StringLiteralValue("bye", false, dummyPos)) shouldBe true
+        (StringLiteralValue("hello", true, dummyPos) == StringLiteralValue("hello", true, dummyPos)) shouldBe true
+        (StringLiteralValue("hello", true, dummyPos) != StringLiteralValue("bye", true, dummyPos)) shouldBe true
+        (StringLiteralValue("hello", true, dummyPos) != StringLiteralValue("hello", false, dummyPos)) shouldBe true

        val lvOne = NumericLiteralValue(DataType.UBYTE, 1, dummyPos)
        val lvTwo = NumericLiteralValue(DataType.UBYTE, 2, dummyPos)
@@ -98,47 +91,44 @@ class TestNumericLiteralValue {
        val lv1 = ArrayLiteralValue(InferredTypes.InferredType.known(DataType.ARRAY_UB), arrayOf(lvOne, lvTwo, lvThree), dummyPos)
        val lv2 = ArrayLiteralValue(InferredTypes.InferredType.known(DataType.ARRAY_UB), arrayOf(lvOneR, lvTwoR, lvThreeR), dummyPos)
        val lv3 = ArrayLiteralValue(InferredTypes.InferredType.known(DataType.ARRAY_UB), arrayOf(lvOneR, lvTwoR, lvFour), dummyPos)
-        assertEquals(lv1, lv2)
-        assertNotEquals(lv1, lv3)
+        lv1 shouldBe lv2
+        lv1 shouldNotBe lv3
    }

-    @Test
-    fun testGreaterThan(){
-        assertTrue(NumericLiteralValue(DataType.UBYTE, 100, dummyPos) > NumericLiteralValue(DataType.UBYTE, 99, dummyPos))
-        assertTrue(NumericLiteralValue(DataType.UWORD, 254, dummyPos) > NumericLiteralValue(DataType.UWORD, 253, dummyPos))
-        assertTrue(NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) > NumericLiteralValue(DataType.FLOAT, 99.9, dummyPos))
+    test("testGreaterThan") {
+        (NumericLiteralValue(DataType.UBYTE, 100, dummyPos) > NumericLiteralValue(DataType.UBYTE, 99, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.UWORD, 254, dummyPos) > NumericLiteralValue(DataType.UWORD, 253, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) > NumericLiteralValue(DataType.FLOAT, 99.9, dummyPos)) shouldBe true

-        assertTrue(NumericLiteralValue(DataType.UBYTE, 100, dummyPos) >= NumericLiteralValue(DataType.UBYTE, 100, dummyPos))
-        assertTrue(NumericLiteralValue(DataType.UWORD, 254, dummyPos) >= NumericLiteralValue(DataType.UWORD, 254, dummyPos))
-        assertTrue(NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) >= NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos))
+        (NumericLiteralValue(DataType.UBYTE, 100, dummyPos) >= NumericLiteralValue(DataType.UBYTE, 100, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.UWORD, 254, dummyPos) >= NumericLiteralValue(DataType.UWORD, 254, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) >= NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos)) shouldBe true

-        assertFalse(NumericLiteralValue(DataType.UBYTE, 100, dummyPos) > NumericLiteralValue(DataType.UBYTE, 100, dummyPos))
-        assertFalse(NumericLiteralValue(DataType.UWORD, 254, dummyPos) > NumericLiteralValue(DataType.UWORD, 254, dummyPos))
-        assertFalse(NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) > NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos))
+        (NumericLiteralValue(DataType.UBYTE, 100, dummyPos) > NumericLiteralValue(DataType.UBYTE, 100, dummyPos)) shouldBe false
+        (NumericLiteralValue(DataType.UWORD, 254, dummyPos) > NumericLiteralValue(DataType.UWORD, 254, dummyPos)) shouldBe false
+        (NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) > NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos)) shouldBe false

-        assertFalse(NumericLiteralValue(DataType.UBYTE, 100, dummyPos) >= NumericLiteralValue(DataType.UBYTE, 101, dummyPos))
-        assertFalse(NumericLiteralValue(DataType.UWORD, 254, dummyPos) >= NumericLiteralValue(DataType.UWORD, 255, dummyPos))
-        assertFalse(NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) >= NumericLiteralValue(DataType.FLOAT, 100.1, dummyPos))
+        (NumericLiteralValue(DataType.UBYTE, 100, dummyPos) >= NumericLiteralValue(DataType.UBYTE, 101, dummyPos)) shouldBe false
+        (NumericLiteralValue(DataType.UWORD, 254, dummyPos) >= NumericLiteralValue(DataType.UWORD, 255, dummyPos)) shouldBe false
+        (NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) >= NumericLiteralValue(DataType.FLOAT, 100.1, dummyPos)) shouldBe false
    }

-    @Test
-    fun testLessThan() {
-        assertTrue(NumericLiteralValue(DataType.UBYTE, 100, dummyPos) < NumericLiteralValue(DataType.UBYTE, 101, dummyPos))
-        assertTrue(NumericLiteralValue(DataType.UWORD, 254, dummyPos) < NumericLiteralValue(DataType.UWORD, 255, dummyPos))
-        assertTrue(NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) < NumericLiteralValue(DataType.FLOAT, 100.1, dummyPos))
+    test("testLessThan") {
+        (NumericLiteralValue(DataType.UBYTE, 100, dummyPos) < NumericLiteralValue(DataType.UBYTE, 101, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.UWORD, 254, dummyPos) < NumericLiteralValue(DataType.UWORD, 255, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) < NumericLiteralValue(DataType.FLOAT, 100.1, dummyPos)) shouldBe true

-        assertTrue(NumericLiteralValue(DataType.UBYTE, 100, dummyPos) <= NumericLiteralValue(DataType.UBYTE, 100, dummyPos))
-        assertTrue(NumericLiteralValue(DataType.UWORD, 254, dummyPos) <= NumericLiteralValue(DataType.UWORD, 254, dummyPos))
-        assertTrue(NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) <= NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos))
+        (NumericLiteralValue(DataType.UBYTE, 100, dummyPos) <= NumericLiteralValue(DataType.UBYTE, 100, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.UWORD, 254, dummyPos) <= NumericLiteralValue(DataType.UWORD, 254, dummyPos)) shouldBe true
+        (NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) <= NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos)) shouldBe true

-        assertFalse(NumericLiteralValue(DataType.UBYTE, 100, dummyPos) < NumericLiteralValue(DataType.UBYTE, 100, dummyPos))
-        assertFalse(NumericLiteralValue(DataType.UWORD, 254, dummyPos) < NumericLiteralValue(DataType.UWORD, 254, dummyPos))
-        assertFalse(NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) < NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos))
+        (NumericLiteralValue(DataType.UBYTE, 100, dummyPos) < NumericLiteralValue(DataType.UBYTE, 100, dummyPos)) shouldBe false
+        (NumericLiteralValue(DataType.UWORD, 254, dummyPos) < NumericLiteralValue(DataType.UWORD, 254, dummyPos)) shouldBe false
+        (NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) < NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos)) shouldBe false

-        assertFalse(NumericLiteralValue(DataType.UBYTE, 100, dummyPos) <= NumericLiteralValue(DataType.UBYTE, 99, dummyPos))
-        assertFalse(NumericLiteralValue(DataType.UWORD, 254, dummyPos) <= NumericLiteralValue(DataType.UWORD, 253, dummyPos))
-        assertFalse(NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) <= NumericLiteralValue(DataType.FLOAT, 99.9, dummyPos))
+        (NumericLiteralValue(DataType.UBYTE, 100, dummyPos) <= NumericLiteralValue(DataType.UBYTE, 99, dummyPos)) shouldBe false
+        (NumericLiteralValue(DataType.UWORD, 254, dummyPos) <= NumericLiteralValue(DataType.UWORD, 253, dummyPos)) shouldBe false
+        (NumericLiteralValue(DataType.FLOAT, 100.0, dummyPos) <= NumericLiteralValue(DataType.FLOAT, 99.9, dummyPos)) shouldBe false
    }

-}
-
+})
@@ -1,26 +1,32 @@
 package prog8tests

-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.assertions.fail
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.shouldNotBe
+import io.kotest.matchers.types.instanceOf
+import io.kotest.matchers.types.shouldBeSameInstanceAs
 import prog8.ast.Program
 import prog8.ast.base.DataType
 import prog8.ast.base.ParentSentinel
 import prog8.ast.base.Position
-import prog8.ast.expressions.NumericLiteralValue
-import prog8.ast.expressions.TypecastExpression
+import prog8.ast.expressions.*
 import prog8.ast.statements.*
+import prog8.compiler.BeforeAsmGenerationAstChanger
+import prog8.compiler.printAst
 import prog8.compiler.target.C64Target
+import prog8.compilerinterface.*
 import prog8tests.helpers.DummyFunctions
 import prog8tests.helpers.DummyMemsizer
 import prog8tests.helpers.DummyStringEncoder
+import prog8tests.helpers.ErrorReporterForTests
 import prog8tests.helpers.assertSuccess
 import prog8tests.helpers.compileText
-import kotlin.test.*
+import prog8tests.helpers.generateAssembly

-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestOptimization {
-    @Test
-    fun testRemoveEmptySubroutineExceptStart() {
+class TestOptimization: FunSpec({
+    test("testRemoveEmptySubroutineExceptStart") {
        val sourcecode = """
            main {
                sub start() {
@@ -34,13 +40,16 @@ class TestOptimization {
        val toplevelModule = result.program.toplevelModule
        val mainBlock = toplevelModule.statements.single() as Block
        val startSub = mainBlock.statements.single() as Subroutine
-        assertSame(result.program.entrypoint, startSub)
-        assertEquals("start", startSub.name, "only start sub should remain")
-        assertTrue(startSub.statements.single() is Return, "compiler has inserted return in empty subroutines")
+        result.program.entrypoint shouldBeSameInstanceAs startSub
+        withClue("only start sub should remain") {
+            startSub.name shouldBe "start"
+        }
+        withClue("compiler has inserted return in empty subroutines") {
+            startSub.statements.single() shouldBe instanceOf<Return>()
+        }
    }

-    @Test
-    fun testDontRemoveEmptySubroutineIfItsReferenced() {
+    test("testDontRemoveEmptySubroutineIfItsReferenced") {
        val sourcecode = """
            main {
                sub start() {
@@ -57,45 +66,44 @@ class TestOptimization {
        val mainBlock = toplevelModule.statements.single() as Block
        val startSub = mainBlock.statements[0] as Subroutine
        val emptySub = mainBlock.statements[1] as Subroutine
-        assertSame(result.program.entrypoint, startSub)
-        assertEquals("start", startSub.name)
-        assertEquals("empty", emptySub.name)
-        assertTrue(emptySub.statements.single() is Return, "compiler has inserted return in empty subroutines")
+        result.program.entrypoint shouldBeSameInstanceAs startSub
+        startSub.name shouldBe "start"
+        emptySub.name shouldBe "empty"
+        withClue("compiler has inserted return in empty subroutines") {
+            emptySub.statements.single() shouldBe instanceOf<Return>()
+        }
    }

-    @Test
-    fun testGeneratedConstvalueInheritsProperParentLinkage()
-    {
+    test("testGeneratedConstvalueInheritsProperParentLinkage") {
        val number = NumericLiteralValue(DataType.UBYTE, 11, Position.DUMMY)
        val tc = TypecastExpression(number, DataType.BYTE, false, Position.DUMMY)
        val program = Program("test", DummyFunctions, DummyMemsizer, DummyStringEncoder)
        tc.linkParents(ParentSentinel)
-        assertNotNull(tc.parent)
-        assertNotNull(number.parent)
-        assertSame(tc, number.parent)
+        tc.parent shouldNotBe null
+        number.parent shouldNotBe null
+        tc shouldBeSameInstanceAs number.parent
        val constvalue = tc.constValue(program)!!
-        assertIs<NumericLiteralValue>(constvalue)
-        assertEquals(11, constvalue.number.toInt())
-        assertEquals(DataType.BYTE, constvalue.type)
-        assertSame(tc, constvalue.parent)
+        constvalue shouldBe instanceOf<NumericLiteralValue>()
+        constvalue.number.toInt() shouldBe 11
+        constvalue.type shouldBe DataType.BYTE
+        tc shouldBeSameInstanceAs constvalue.parent
    }

-    @Test
-    fun testConstantFoldedAndSilentlyTypecastedForInitializerValues() {
+    test("testConstantFoldedAndSilentlyTypecastedForInitializerValues") {
        val sourcecode = """
            main {
                sub start() {
                    const ubyte TEST = 10
-                    byte x1 = TEST as byte + 1
-                    byte x2 = 1 + TEST as byte
-                    ubyte y1 = TEST + 1 as byte
-                    ubyte y2 = 1 as byte + TEST
+                    byte @shared x1 = TEST as byte + 1
+                    byte @shared x2 = 1 + TEST as byte
+                    ubyte @shared y1 = TEST + 1 as byte
+                    ubyte @shared y2 = 1 as byte + TEST
                }
            }
        """
        val result = compileText(C64Target, true, sourcecode).assertSuccess()
        val mainsub = result.program.entrypoint
-        assertEquals(10, mainsub.statements.size)
+        mainsub.statements.size shouldBe 10
        val declTest = mainsub.statements[0] as VarDecl
        val declX1 = mainsub.statements[1] as VarDecl
        val initX1 = mainsub.statements[2] as Assignment
@@ -105,19 +113,212 @@ class TestOptimization {
        val initY1 = mainsub.statements[6] as Assignment
        val declY2 = mainsub.statements[7] as VarDecl
        val initY2 = mainsub.statements[8] as Assignment
-        assertIs<Return>(mainsub.statements[9])
-        assertEquals(10.0, (declTest.value as NumericLiteralValue).number.toDouble())
-        assertNull(declX1.value)
-        assertNull(declX2.value)
-        assertNull(declY1.value)
-        assertNull(declY2.value)
-        assertEquals(DataType.BYTE, (initX1.value as NumericLiteralValue).type)
-        assertEquals(11.0, (initX1.value as NumericLiteralValue).number.toDouble())
-        assertEquals(DataType.BYTE, (initX2.value as NumericLiteralValue).type)
-        assertEquals(11.0, (initX2.value as NumericLiteralValue).number.toDouble())
-        assertEquals(DataType.UBYTE, (initY1.value as NumericLiteralValue).type)
-        assertEquals(11.0, (initY1.value as NumericLiteralValue).number.toDouble())
-        assertEquals(DataType.UBYTE, (initY2.value as NumericLiteralValue).type)
-        assertEquals(11.0, (initY2.value as NumericLiteralValue).number.toDouble())
+        mainsub.statements[9] shouldBe instanceOf<Return>()
+        (declTest.value as NumericLiteralValue).number.toDouble() shouldBe 10.0
+        declX1.value shouldBe null
+        declX2.value shouldBe null
+        declY1.value shouldBe null
+        declY2.value shouldBe null
+        (initX1.value as NumericLiteralValue).type shouldBe DataType.BYTE
+        (initX1.value as NumericLiteralValue).number.toDouble() shouldBe 11.0
+        (initX2.value as NumericLiteralValue).type shouldBe DataType.BYTE
+        (initX2.value as NumericLiteralValue).number.toDouble() shouldBe 11.0
+        (initY1.value as NumericLiteralValue).type shouldBe DataType.UBYTE
+        (initY1.value as NumericLiteralValue).number.toDouble() shouldBe 11.0
+        (initY2.value as NumericLiteralValue).type shouldBe DataType.UBYTE
+        (initY2.value as NumericLiteralValue).number.toDouble() shouldBe 11.0
    }
-}
+
+    test("typecasted assignment from ubyte logical expressoin to uword var") {
+        val src = """
+            main {
+                sub start() {
+                    ubyte bb
+                    uword ww
+                    ww = not bb or not ww       ; expression combining ubyte and uword
+                }
+            }
+        """
+        val result = compileText(C64Target, false, src, writeAssembly = false).assertSuccess()
+
+        // ww = ((( not bb as uword)  or  not ww) as uword)
+        val wwAssign = result.program.entrypoint.statements.last() as Assignment
+        val expr = wwAssign.value as TypecastExpression
+
+        wwAssign.target.identifier?.nameInSource shouldBe listOf("ww")
+        expr.type shouldBe DataType.UWORD
+        expr.expression.inferType(result.program).istype(DataType.UBYTE) shouldBe true
+    }
+
+    test("intermediate assignment steps have correct types for codegen phase (BeforeAsmGenerationAstChanger)") {
+        val src = """
+            main {
+                sub start() {
+                    ubyte bb
+                    uword ww
+                    bb = not bb or not ww       ; expression combining ubyte and uword
+                }
+            }
+        """
+        val result = compileText(C64Target, false, src, writeAssembly = false).assertSuccess()
+
+        // bb = (( not bb as uword)  or  not ww)
+        val bbAssign = result.program.entrypoint.statements.last() as Assignment
+        val expr = bbAssign.value as BinaryExpression
+        expr.operator shouldBe "or"
+        expr.left shouldBe instanceOf<TypecastExpression>() // casted to word
+        expr.right shouldBe instanceOf<PrefixExpression>()
+        expr.left.inferType(result.program).getOrElse { fail("dt") } shouldBe DataType.UWORD
+        expr.right.inferType(result.program).getOrElse { fail("dt") } shouldBe DataType.UWORD
+        expr.inferType(result.program).getOrElse { fail("dt") } shouldBe DataType.UBYTE
+
+        val options = CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.DONTUSE, emptyList(), false, true, C64Target)
+        val changer = BeforeAsmGenerationAstChanger(result.program,
+            options,
+            ErrorReporterForTests()
+        )
+
+        changer.visit(result.program)
+        while(changer.applyModifications()>0) {
+            changer.visit(result.program)
+        }
+
+        // assignment is now split into:
+        //     bb =  not bb
+        //     bb = (bb or  not ww)
+
+        val assigns = result.program.entrypoint.statements.filterIsInstance<Assignment>()
+        val bbAssigns = assigns.filter { it.value !is NumericLiteralValue }
+        bbAssigns.size shouldBe 2
+
+        bbAssigns[0].target.identifier!!.nameInSource shouldBe listOf("bb")
+        bbAssigns[0].value shouldBe instanceOf<PrefixExpression>()
+        (bbAssigns[0].value as PrefixExpression).operator shouldBe "not"
+        (bbAssigns[0].value as PrefixExpression).expression shouldBe IdentifierReference(listOf("bb"), Position.DUMMY)
+        bbAssigns[0].value.inferType(result.program).getOrElse { fail("dt") } shouldBe DataType.UBYTE
+
+        bbAssigns[1].target.identifier!!.nameInSource shouldBe listOf("bb")
+        val bbAssigns1expr = bbAssigns[1].value as BinaryExpression
+        bbAssigns1expr.operator shouldBe "or"
+        bbAssigns1expr.left shouldBe IdentifierReference(listOf("bb"), Position.DUMMY)
+        bbAssigns1expr.right shouldBe instanceOf<PrefixExpression>()
+        (bbAssigns1expr.right as PrefixExpression).operator shouldBe "not"
+        (bbAssigns1expr.right as PrefixExpression).expression shouldBe IdentifierReference(listOf("ww"), Position.DUMMY)
+        bbAssigns1expr.inferType(result.program).getOrElse { fail("dt") } shouldBe DataType.UBYTE
+
+        val asm = generateAssembly(result.program, options)
+        asm.valid shouldBe true
+    }
+
+    test("intermediate assignment steps generated for typecasted expression") {
+        val src = """
+            main {
+                sub start() {
+                    ubyte r
+                    ubyte @shared bb = (cos8(r)/2 + 100) as ubyte
+                }
+            }
+        """
+        val result = compileText(C64Target, true, src, writeAssembly = true).assertSuccess()
+        /* turned into:
+        ubyte r
+        r = 0
+        ubyte bb
+        prog8_lib.retval_interm_b = cos8(r)
+        prog8_lib.retval_interm_b >>= 1
+        prog8_lib.retval_interm_b += 100
+        bb = prog8_lib.retval_interm_b
+        return
+         */
+        val st = result.program.entrypoint.statements
+        st.size shouldBe 8
+        st.last() shouldBe instanceOf<Return>()
+        var assign = st[3] as Assignment
+        assign.target.identifier!!.nameInSource shouldBe listOf("prog8_lib","retval_interm_b")
+        assign = st[4] as Assignment
+        assign.target.identifier!!.nameInSource shouldBe listOf("prog8_lib","retval_interm_b")
+        assign = st[5] as Assignment
+        assign.target.identifier!!.nameInSource shouldBe listOf("prog8_lib","retval_interm_b")
+        assign = st[6] as Assignment
+        assign.target.identifier!!.nameInSource shouldBe listOf("bb")
+    }
+
+    test("asmgen correctly deals with float typecasting in augmented assignment") {
+        val src="""
+            %option enable_floats
+            
+            main {
+                sub start() {
+                    ubyte ub
+                    float ff
+                    ff += (ub as float)         ; operator doesn't matter
+                }
+            }
+        """
+        val result1 = compileText(C64Target, optimize=false, src, writeAssembly = false).assertSuccess()
+
+        val assignYY = result1.program.entrypoint.statements.last() as Assignment
+        assignYY.isAugmentable shouldBe true
+        assignYY.target.identifier!!.nameInSource shouldBe listOf("ff")
+        val value = assignYY.value as BinaryExpression
+        value.operator shouldBe "+"
+        value.left shouldBe IdentifierReference(listOf("ff"), Position.DUMMY)
+        value.right shouldBe instanceOf<TypecastExpression>()
+
+        val asm = generateAssembly(result1.program)
+        asm.valid shouldBe true
+    }
+
+    test("unused variable removal") {
+        val src="""
+            main {
+                sub start() {
+                    ubyte unused
+                    ubyte @shared unused_but_shared     ; this one should remain
+                    ubyte usedvar_only_written
+                    usedvar_only_written=2
+                    usedvar_only_written++
+                    ubyte usedvar                       ; and this one too
+                    usedvar = msb(usedvar)
+                }
+            }
+        """
+        val result = compileText(C64Target, optimize=true, src, writeAssembly=false).assertSuccess()
+        result.program.entrypoint.statements.size shouldBe 4       // unused_but_shared decl, unused_but_shared=0,  usedvar decl, usedvar assign
+        val (decl, assign, decl2, assign2) = result.program.entrypoint.statements
+        decl shouldBe instanceOf<VarDecl>()
+        (decl as VarDecl).name shouldBe "unused_but_shared"
+        assign shouldBe instanceOf<Assignment>()
+        decl2 shouldBe instanceOf<VarDecl>()
+        (decl2 as VarDecl).name shouldBe "usedvar"
+        assign2 shouldBe instanceOf<Assignment>()
+    }
+
+    test("unused variable removal from subscope") {
+        val src="""
+            main {
+                sub start()  {
+                    if cx16.r0 {
+                        uword xx = 42       ; to be removed
+                        xx=99               ; to be removed
+                        cx16.r0 = 0
+                    }
+                    func2()
+            
+                    sub func2() {
+                         uword yy = 33      ; to be removed
+                         yy=99              ; to be removed
+                         cx16.r0 = 0
+                    }
+                }
+            }"""
+        val result = compileText(C64Target, optimize=true, src, writeAssembly=false).assertSuccess()
+        result.program.entrypoint.statements.size shouldBe 3
+        val ifstmt = result.program.entrypoint.statements[0] as IfStatement
+        ifstmt.truepart.statements.size shouldBe 1
+        (ifstmt.truepart.statements[0] as Assignment).target.identifier!!.nameInSource shouldBe listOf("cx16", "r0")
+        val func2 = result.program.entrypoint.statements[2] as Subroutine
+        func2.statements.size shouldBe 1
+        (func2.statements[0] as Assignment).target.identifier!!.nameInSource shouldBe listOf("cx16", "r0")
+    }
+})
@@ -1,94 +1,91 @@
 package prog8tests

 import com.github.michaelbull.result.Ok
-import com.github.michaelbull.result.expect
 import com.github.michaelbull.result.expectError
 import com.github.michaelbull.result.getOrElse
-import org.hamcrest.MatcherAssert.assertThat
-import org.hamcrest.Matchers.equalTo
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
 import prog8.compiler.target.cbm.Petscii
 import java.io.CharConversionException
-import kotlin.test.assertEquals
-import kotlin.test.assertFailsWith


-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestPetscii {
+class TestPetscii: FunSpec({

-    @Test
-    fun testZero() {
-        assertThat(Petscii.encodePetscii("\u0000", true), equalTo(Ok(listOf<Short>(0))))
-        assertThat(Petscii.encodePetscii("\u0000", false), equalTo(Ok(listOf<Short>(0))))
-        assertThat(Petscii.decodePetscii(listOf(0), true), equalTo("\u0000"))
-        assertThat(Petscii.decodePetscii(listOf(0), false), equalTo("\u0000"))
+    test("testZero") {
+        Petscii.encodePetscii("\u0000", true) shouldBe Ok(listOf<Short>(0))
+        Petscii.encodePetscii("\u0000", false) shouldBe Ok(listOf<Short>(0))
+        Petscii.decodePetscii(listOf(0), true) shouldBe "\u0000"
+        Petscii.decodePetscii(listOf(0), false) shouldBe "\u0000"
    }

-    @Test
-    fun testLowercase() {
-        assertThat(Petscii.encodePetscii("hello WORLD 123 @!£", true), equalTo(
-                Ok(listOf<Short>(72, 69, 76, 76, 79, 32, 0xd7, 0xcf, 0xd2, 0xcc, 0xc4, 32, 49, 50, 51, 32, 64, 33, 0x5c))))
-        assertThat(Petscii.encodePetscii("\uf11a", true), equalTo(Ok(listOf<Short>(0x12))))   // reverse vid
-        assertThat(Petscii.encodePetscii("✓", true), equalTo(Ok(listOf<Short>(0xfa))))
-        assertThat("expect lowercase error fallback", Petscii.encodePetscii("π", true), equalTo(Ok(listOf<Short>(255))))
-        assertThat("expect lowercase error fallback", Petscii.encodePetscii("♥", true), equalTo(Ok(listOf<Short>(0xd3))))
+    test("testLowercase") {
+        Petscii.encodePetscii("hello WORLD 123 @!£", true) shouldBe
+                Ok(listOf<Short>(72, 69, 76, 76, 79, 32, 0xd7, 0xcf, 0xd2, 0xcc, 0xc4, 32, 49, 50, 51, 32, 64, 33, 0x5c))
+        Petscii.encodePetscii("\uf11a", true) shouldBe Ok(listOf<Short>(0x12))   // reverse vid
+        Petscii.encodePetscii("✓", true) shouldBe Ok(listOf<Short>(0xfa))
+        withClue("expect lowercase error fallback") {
+            Petscii.encodePetscii("π", true) shouldBe Ok(listOf<Short>(255))
+            Petscii.encodePetscii("♥", true) shouldBe Ok(listOf<Short>(0xd3))
+        }

-        assertThat(Petscii.decodePetscii(listOf(72, 0xd7, 0x5c, 0xfa, 0x12), true), equalTo("hW£✓\uF11A"))
+        Petscii.decodePetscii(listOf(72, 0xd7, 0x5c, 0xfa, 0x12), true) shouldBe "hW£✓\uF11A"
    }

-    @Test
-    fun testUppercase() {
-        assertThat(Petscii.encodePetscii("HELLO 123 @!£"), equalTo(
-                Ok(listOf<Short>(72, 69, 76, 76, 79, 32, 49, 50, 51, 32, 64, 33, 0x5c))))
-        assertThat(Petscii.encodePetscii("\uf11a"), equalTo(Ok(listOf<Short>(0x12))))   // reverse vid
-        assertThat(Petscii.encodePetscii("♥"), equalTo(Ok(listOf<Short>(0xd3))))
-        assertThat(Petscii.encodePetscii("π"), equalTo(Ok(listOf<Short>(0xff))))
-        assertThat("expecting fallback", Petscii.encodePetscii("✓"), equalTo(Ok(listOf<Short>(250))))
+    test("testUppercase") {
+        Petscii.encodePetscii("HELLO 123 @!£") shouldBe
+                Ok(listOf<Short>(72, 69, 76, 76, 79, 32, 49, 50, 51, 32, 64, 33, 0x5c))
+        Petscii.encodePetscii("\uf11a") shouldBe Ok(listOf<Short>(0x12))   // reverse vid
+        Petscii.encodePetscii("♥") shouldBe Ok(listOf<Short>(0xd3))
+        Petscii.encodePetscii("π") shouldBe Ok(listOf<Short>(0xff))
+        withClue("expecting fallback") {
+            Petscii.encodePetscii("✓") shouldBe Ok(listOf<Short>(250))
+        }

-        assertThat(Petscii.decodePetscii(listOf(72, 0x5c, 0xd3, 0xff)), equalTo("H£♥π"))
+        Petscii.decodePetscii(listOf(72, 0x5c, 0xd3, 0xff)) shouldBe "H£♥π"
    }

-    @Test
-    fun testScreencodeLowercase() {
-        assertThat(Petscii.encodeScreencode("hello WORLD 123 @!£", true), equalTo(
+    test("testScreencodeLowercase") {
+        Petscii.encodeScreencode("hello WORLD 123 @!£", true) shouldBe
                Ok(listOf<Short>(0x08, 0x05, 0x0c, 0x0c, 0x0f, 0x20, 0x57, 0x4f, 0x52, 0x4c, 0x44, 0x20, 0x31, 0x32, 0x33, 0x20, 0x00, 0x21, 0x1c))
-        ))
-        assertThat(Petscii.encodeScreencode("✓", true), equalTo(Ok(listOf<Short>(0x7a))))
-        assertThat("expect fallback", Petscii.encodeScreencode("♥", true), equalTo(Ok(listOf<Short>(83))))
-        assertThat("expect fallback", Petscii.encodeScreencode("π", true), equalTo(Ok(listOf<Short>(94))))
+        Petscii.encodeScreencode("✓", true) shouldBe Ok(listOf<Short>(0x7a))
+        withClue("expect fallback") {
+            Petscii.encodeScreencode("♥", true) shouldBe Ok(listOf<Short>(83))
+            Petscii.encodeScreencode("π", true) shouldBe Ok(listOf<Short>(94))
+        }

-        assertThat(Petscii.decodeScreencode(listOf(0x08, 0x57, 0x1c, 0x7a), true), equalTo("hW£✓"))
+        Petscii.decodeScreencode(listOf(0x08, 0x57, 0x1c, 0x7a), true) shouldBe "hW£✓"
    }

-    @Test
-    fun testScreencodeUppercase() {
-        assertThat(Petscii.encodeScreencode("WORLD 123 @!£"), equalTo(
-                Ok(listOf<Short>(0x17, 0x0f, 0x12, 0x0c, 0x04, 0x20, 0x31, 0x32, 0x33, 0x20, 0x00, 0x21, 0x1c))))
-        assertThat(Petscii.encodeScreencode("♥"), equalTo(Ok(listOf<Short>(0x53))))
-        assertThat(Petscii.encodeScreencode("π"), equalTo(Ok(listOf<Short>(0x5e))))
-        assertThat(Petscii.encodeScreencode("HELLO"), equalTo(Ok(listOf<Short>(8, 5, 12, 12, 15))))
-        assertThat("expecting fallback", Petscii.encodeScreencode("hello"), equalTo(Ok(listOf<Short>(8, 5, 12, 12, 15))))
-        assertThat("expecting fallback", Petscii.encodeScreencode("✓"), equalTo(Ok(listOf<Short>(122))))
+    test("testScreencodeUppercase") {
+        Petscii.encodeScreencode("WORLD 123 @!£") shouldBe
+                Ok(listOf<Short>(0x17, 0x0f, 0x12, 0x0c, 0x04, 0x20, 0x31, 0x32, 0x33, 0x20, 0x00, 0x21, 0x1c))
+        Petscii.encodeScreencode("♥") shouldBe Ok(listOf<Short>(0x53))
+        Petscii.encodeScreencode("π") shouldBe Ok(listOf<Short>(0x5e))
+        Petscii.encodeScreencode("HELLO") shouldBe Ok(listOf<Short>(8, 5, 12, 12, 15))
+        withClue("expecting fallback") {
+            Petscii.encodeScreencode("hello") shouldBe Ok(listOf<Short>(8, 5, 12, 12, 15))
+            Petscii.encodeScreencode("✓") shouldBe Ok(listOf<Short>(122))
+        }

-        assertThat(Petscii.decodeScreencode(listOf(0x17, 0x1c, 0x53, 0x5e)), equalTo("W£♥π"))
+        Petscii.decodeScreencode(listOf(0x17, 0x1c, 0x53, 0x5e)) shouldBe "W£♥π"
    }

-    @Test
-    fun testErrorCases() {
+    test("testErrorCases") {
        Petscii.encodePetscii("~", true).expectError { "shouldn't be able to encode tilde" }
        Petscii.encodePetscii("~", false).expectError { "shouldn't be able to encode tilde" }
        Petscii.encodeScreencode("~", true).expectError { "shouldn't be able to encode tilde" }
        Petscii.encodeScreencode("~", false).expectError { "shouldn't be able to encode tilde" }

-        assertFailsWith<CharConversionException> { Petscii.decodePetscii(listOf<Short>(-1), true) }
-        assertFailsWith<CharConversionException> { Petscii.decodePetscii(listOf<Short>(256), true) }
-        assertFailsWith<CharConversionException> { Petscii.decodePetscii(listOf<Short>(-1), false) }
-        assertFailsWith<CharConversionException> { Petscii.decodePetscii(listOf<Short>(256), false) }
-        assertFailsWith<CharConversionException> { Petscii.decodeScreencode(listOf<Short>(-1), true) }
-        assertFailsWith<CharConversionException> { Petscii.decodeScreencode(listOf<Short>(256), true) }
-        assertFailsWith<CharConversionException> { Petscii.decodeScreencode(listOf<Short>(-1), false) }
-        assertFailsWith<CharConversionException> { Petscii.decodeScreencode(listOf<Short>(256), false) }
+        shouldThrow<CharConversionException> { Petscii.decodePetscii(listOf<Short>(-1), true) }
+        shouldThrow<CharConversionException> { Petscii.decodePetscii(listOf<Short>(256), true) }
+        shouldThrow<CharConversionException> { Petscii.decodePetscii(listOf<Short>(-1), false) }
+        shouldThrow<CharConversionException> { Petscii.decodePetscii(listOf<Short>(256), false) }
+        shouldThrow<CharConversionException> { Petscii.decodeScreencode(listOf<Short>(-1), true) }
+        shouldThrow<CharConversionException> { Petscii.decodeScreencode(listOf<Short>(256), true) }
+        shouldThrow<CharConversionException> { Petscii.decodeScreencode(listOf<Short>(-1), false) }
+        shouldThrow<CharConversionException> { Petscii.decodeScreencode(listOf<Short>(256), false) }

        Petscii.scr2petscii(-1).expectError { "-1 should error" }
        Petscii.scr2petscii(256).expectError { "256 should error" }
@@ -98,9 +95,7 @@ class TestPetscii {
        Petscii.petscii2scr(256, false).expectError { "256 should error" }
    }

-    @Test
-    fun testSpecialReplacements()
-    {
+    test("testSpecialReplacements") {
        fun encodeP(c: Char, lower: Boolean) = Petscii.encodePetscii(c.toString(), lower).getOrElse { throw it }.single()
        fun encodeS(c: Char, lower: Boolean) = Petscii.encodeScreencode(c.toString(), lower).getOrElse { throw it }.single()

@@ -109,92 +104,90 @@ class TestPetscii {
        Petscii.encodePetscii("~", false).expectError { "shouldn't have translation for tilde" }
        Petscii.encodePetscii("~", true).expectError { "shouldn't have translation for tilde" }

-        assertEquals(94, encodeP('^', false))
-        assertEquals(94, encodeP('^', true))
-        assertEquals(30, encodeS('^', false))
-        assertEquals(30, encodeS('^', true))
-        assertEquals(228, encodeP('_', false))
-        assertEquals(228, encodeP('_', true))
-        assertEquals(100, encodeS('_', false))
-        assertEquals(100, encodeS('_', true))
-        assertEquals(243, encodeP('{', false))
-        assertEquals(243, encodeP('{', true))
-        assertEquals(115, encodeS('{', false))
-        assertEquals(115, encodeS('{', true))
-        assertEquals(235, encodeP('}', false))
-        assertEquals(235, encodeP('}', true))
-        assertEquals(107, encodeS('}', false))
-        assertEquals(107, encodeS('}', true))
-        assertEquals(221, encodeP('|', false))
-        assertEquals(221, encodeP('|', true))
-        assertEquals(93, encodeS('|', false))
-        assertEquals(93, encodeS('|', true))
-        assertEquals(205, encodeP('\\', false))
-        assertEquals(205, encodeP('\\', true))
-        assertEquals(77, encodeS('\\', false))
-        assertEquals(77, encodeS('\\', true))
+        encodeP('^', false) shouldBe 94
+        encodeP('^', true) shouldBe 94
+        encodeS('^', false) shouldBe 30
+        encodeS('^', true) shouldBe 30
+        encodeP('_', false) shouldBe 228
+        encodeP('_', true) shouldBe 228
+        encodeS('_', false) shouldBe 100
+        encodeS('_', true) shouldBe 100
+        encodeP('{', false) shouldBe 243
+        encodeP('{', true) shouldBe 243
+        encodeS('{', false) shouldBe 115
+        encodeS('{', true) shouldBe 115
+        encodeP('}', false) shouldBe 235
+        encodeP('}', true) shouldBe 235
+        encodeS('}', false) shouldBe 107
+        encodeS('}', true) shouldBe 107
+        encodeP('|', false) shouldBe 221
+        encodeP('|', true) shouldBe 221
+        encodeS('|', false) shouldBe 93
+        encodeS('|', true) shouldBe 93
+        encodeP('\\', false) shouldBe 205
+        encodeP('\\', true) shouldBe 205
+        encodeS('\\', false) shouldBe 77
+        encodeS('\\', true) shouldBe 77
    }

-    @Test
-    fun testBoxDrawingCharsEncoding() {
+    test("testBoxDrawingCharsEncoding") {
        fun encodeP(c: Char, lower: Boolean) = Petscii.encodePetscii(c.toString(), lower).getOrElse { throw it }.single()
        fun encodeS(c: Char, lower: Boolean) = Petscii.encodeScreencode(c.toString(), lower).getOrElse { throw it }.single()

        // pipe char
-        assertEquals(221, encodeP('|', false))
-        assertEquals(221, encodeP('|', true))
-        assertEquals(93, encodeS('|', false))
-        assertEquals(93, encodeS('|', true))
+        encodeP('|', false) shouldBe 221
+        encodeP('|', true) shouldBe 221
+        encodeS('|', false) shouldBe 93
+        encodeS('|', true) shouldBe 93
        // ... same as '│', 0x7D -> BOX DRAWINGS LIGHT VERTICAL
-        assertEquals(221, encodeP('│', false))
-        assertEquals(221, encodeP('│', true))
-        assertEquals(93, encodeS('│', false))
-        assertEquals(93, encodeS('│', true))
+        encodeP('│', false) shouldBe 221
+        encodeP('│', true) shouldBe 221
+        encodeS('│', false) shouldBe 93
+        encodeS('│', true) shouldBe 93

        // underscore
-        assertEquals(228, encodeP('_', false))
-        assertEquals(228, encodeP('_', true))
-        assertEquals(100, encodeS('_', false))
-        assertEquals(100, encodeS('_', true))
+        encodeP('_', false) shouldBe 228
+        encodeP('_', true) shouldBe 228
+        encodeS('_', false) shouldBe 100
+        encodeS('_', true) shouldBe 100
        // ... same as '▁',  0xE4 LOWER ONE EIGHTH BLOCK
-        assertEquals(228, encodeP('▁', false))
-        assertEquals(228, encodeP('▁', true))
-        assertEquals(100, encodeS('▁', false))
-        assertEquals(100, encodeS('▁', true))
+        encodeP('▁', false) shouldBe 228
+        encodeP('▁', true) shouldBe 228
+        encodeS('▁', false) shouldBe 100
+        encodeS('▁', true) shouldBe 100

        // ─    0xC0 -> BOX DRAWINGS LIGHT HORIZONTAL
-        assertEquals(192, encodeP('─', false))
-        assertEquals(192, encodeP('─', true))
-        assertEquals(64, encodeS('─', false))
-        assertEquals(64, encodeS('─', true))
+        encodeP('─', false) shouldBe 192
+        encodeP('─', true) shouldBe 192
+        encodeS('─', false) shouldBe 64
+        encodeS('─', true) shouldBe 64
        // │    0x62 -> BOX DRAWINGS LIGHT VERTICAL
-        assertEquals(221, encodeP('│', false))
-        assertEquals(221, encodeP('│', true))
-        assertEquals(93, encodeS('│', false))
-        assertEquals(93, encodeS('│', true))
+        encodeP('│', false) shouldBe 221
+        encodeP('│', true) shouldBe 221
+        encodeS('│', false) shouldBe 93
+        encodeS('│', true) shouldBe 93
    }

-    @Test
-    fun testBoxDrawingCharsDecoding() {
+    test("testBoxDrawingCharsDecoding") {
        // ─    0xC0 -> BOX DRAWINGS LIGHT HORIZONTAL
-        assertEquals('\uf13b', Petscii.decodePetscii(listOf(195), false).single(), "BOX DRAWINGS LIGHT HORIZONTAL ONE EIGHTH UP (CUS)")
-        assertEquals('C', Petscii.decodePetscii(listOf(195), true).single())
-        assertEquals('─', Petscii.decodePetscii(listOf(192), false).single())
-        assertEquals('─', Petscii.decodePetscii(listOf(192), true).single())
-        assertEquals('\uf13b', Petscii.decodeScreencode(listOf(67), false).single(), "BOX DRAWINGS LIGHT HORIZONTAL ONE EIGHTH UP (CUS)")
-        assertEquals('C', Petscii.decodeScreencode(listOf(67), true).single())
-        assertEquals('─', Petscii.decodeScreencode(listOf(64), false).single())
-        assertEquals('─', Petscii.decodeScreencode(listOf(64), true).single())
+        Petscii.decodePetscii(listOf(195), false).single() shouldBe '\uf13b' //"BOX DRAWINGS LIGHT HORIZONTAL ONE EIGHTH UP (CUS)"
+        Petscii.decodePetscii(listOf(195), true).single() shouldBe 'C'
+        Petscii.decodePetscii(listOf(192), false).single() shouldBe '─'
+        Petscii.decodePetscii(listOf(192), true).single() shouldBe '─'
+        Petscii.decodeScreencode(listOf(67), false).single() shouldBe '\uf13b' //"BOX DRAWINGS LIGHT HORIZONTAL ONE EIGHTH UP (CUS)"
+        Petscii.decodeScreencode(listOf(67), true).single() shouldBe 'C'
+        Petscii.decodeScreencode(listOf(64), false).single() shouldBe '─'
+        Petscii.decodeScreencode(listOf(64), true).single() shouldBe '─'

        // │    0x62 -> BOX DRAWINGS LIGHT VERTICAL
-        assertEquals('│', Petscii.decodePetscii(listOf(125), false).single())
-        assertEquals('│', Petscii.decodePetscii(listOf(125), true).single())
-        assertEquals('│', Petscii.decodePetscii(listOf(221), false).single())
-        assertEquals('│', Petscii.decodePetscii(listOf(221), true).single())
-        assertEquals('│', Petscii.decodeScreencode(listOf(93), false).single())
-        assertEquals('│', Petscii.decodeScreencode(listOf(93), true).single())
-        assertEquals('\uf13c', Petscii.decodeScreencode(listOf(66), false).single(), "BOX DRAWINGS LIGHT VERTICAL ONE EIGHTH LEFT (CUS)")
-        assertEquals('B', Petscii.decodeScreencode(listOf(66), true).single())
+        Petscii.decodePetscii(listOf(125), false).single() shouldBe '│'
+        Petscii.decodePetscii(listOf(125), true).single() shouldBe '│'
+        Petscii.decodePetscii(listOf(221), false).single() shouldBe '│'
+        Petscii.decodePetscii(listOf(221), true).single() shouldBe '│'
+        Petscii.decodeScreencode(listOf(93), false).single() shouldBe '│'
+        Petscii.decodeScreencode(listOf(93), true).single() shouldBe '│'
+        Petscii.decodeScreencode(listOf(66), false).single() shouldBe '\uf13c' // "BOX DRAWINGS LIGHT VERTICAL ONE EIGHTH LEFT (CUS)"
+        Petscii.decodeScreencode(listOf(66), true).single() shouldBe 'B'
    }

-}
+})
@@ -1,7 +1,10 @@
 package prog8tests

-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.types.instanceOf
+import io.kotest.matchers.types.shouldBeSameInstanceAs
 import prog8.ast.GlobalNamespace
 import prog8.ast.base.ParentSentinel
 import prog8.ast.expressions.NumericLiteralValue
@@ -9,14 +12,11 @@ import prog8.ast.statements.*
 import prog8.compiler.target.C64Target
 import prog8tests.helpers.assertSuccess
 import prog8tests.helpers.compileText
-import kotlin.test.*


-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestScoping {
+class TestScoping: FunSpec({

-    @Test
-    fun testModulesParentIsGlobalNamespace() {
+    test("testModulesParentIsGlobalNamespace") {
        val src = """
            main {
                sub start() {
@@ -26,13 +26,12 @@ class TestScoping {

        val result = compileText(C64Target, false, src, writeAssembly = false).assertSuccess()
        val module = result.program.toplevelModule
-        assertIs<GlobalNamespace>(module.parent)
-        assertSame(result.program, module.program)
-        assertIs<ParentSentinel>(module.parent.parent)
+        module.parent shouldBe instanceOf<GlobalNamespace>()
+        module.program shouldBeSameInstanceAs result.program
+        module.parent.parent shouldBe instanceOf<ParentSentinel>()
    }

-    @Test
-    fun testAnonScopeVarsMovedIntoSubroutineScope() {
+    test("testAnonScopeVarsMovedIntoSubroutineScope") {
        val src = """
            main {
                sub start() {
@@ -49,19 +48,28 @@ class TestScoping {
        val mainBlock = module.statements.single() as Block
        val start = mainBlock.statements.single() as Subroutine
        val repeatbody = start.statements.filterIsInstance<RepeatLoop>().single().body
-        assertFalse(mainBlock.statements.any { it is VarDecl }, "no vars moved to main block")
+        withClue("no vars moved to main block") {
+            mainBlock.statements.any { it is VarDecl } shouldBe false
+        }
        val subroutineVars = start.statements.filterIsInstance<VarDecl>()
-        assertEquals(1, subroutineVars.size, "var from repeat anonscope must be moved up to subroutine")
-        assertEquals("xx", subroutineVars[0].name)
-        assertFalse(repeatbody.statements.any { it is VarDecl }, "var should have been removed from repeat anonscope")
+        withClue("var from repeat anonscope must be moved up to subroutine") {
+            subroutineVars.size shouldBe 1
+        }
+        subroutineVars[0].name shouldBe "xx"
+        withClue("var should have been removed from repeat anonscope") {
+            repeatbody.statements.any { it is VarDecl } shouldBe false
+        }
        val initassign = repeatbody.statements[0] as? Assignment
-        assertEquals(listOf("xx"), initassign?.target?.identifier?.nameInSource, "vardecl in repeat should be replaced by init assignment")
-        assertEquals(99, (initassign?.value as? NumericLiteralValue)?.number?.toInt(), "vardecl in repeat should be replaced by init assignment")
-        assertTrue(repeatbody.statements[1] is PostIncrDecr)
+        withClue("vardecl in repeat should be replaced by init assignment") {
+            initassign?.target?.identifier?.nameInSource shouldBe listOf("xx")
+        }
+        withClue("vardecl in repeat should be replaced by init assignment") {
+            (initassign?.value as? NumericLiteralValue)?.number?.toInt() shouldBe 99
+        }
+        repeatbody.statements[1] shouldBe instanceOf<PostIncrDecr>()
    }

-    @Test
-    fun testLabelsWithAnonScopes() {
+    test("testLabelsWithAnonScopes") {
        val src = """
            main {
                sub start() {
@@ -120,7 +128,9 @@ class TestScoping {
        val mainBlock = module.statements.single() as Block
        val start = mainBlock.statements.single() as Subroutine
        val labels = start.statements.filterIsInstance<Label>()
-        assertEquals(1, labels.size, "only one label in subroutine scope")
+        withClue("only one label in subroutine scope") {
+            labels.size shouldBe 1
+        }
    }

-}
+})
@@ -1,8 +1,11 @@
 package prog8tests

-import org.junit.jupiter.api.Disabled
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.shouldNotBe
+import io.kotest.matchers.string.shouldContain
+import io.kotest.matchers.types.instanceOf
 import prog8.ast.base.DataType
 import prog8.ast.expressions.*
 import prog8.ast.statements.*
@@ -11,14 +14,11 @@ import prog8tests.helpers.ErrorReporterForTests
 import prog8tests.helpers.assertFailure
 import prog8tests.helpers.assertSuccess
 import prog8tests.helpers.compileText
-import kotlin.test.*


-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestSubroutines {
+class TestSubroutines: FunSpec({

-    @Test
-    fun stringParameter() {
+    test("stringParameter") {
        val text = """
            main {
                sub start() {
@@ -46,27 +46,30 @@ class TestSubroutines {
        val mainBlock = module.statements.single() as Block
        val asmfunc = mainBlock.statements.filterIsInstance<Subroutine>().single { it.name=="asmfunc"}
        val func = mainBlock.statements.filterIsInstance<Subroutine>().single { it.name=="func"}
-        assertTrue(asmfunc.isAsmSubroutine)
-        assertEquals(DataType.STR, asmfunc.parameters.single().type)
-        assertTrue(asmfunc.statements.isEmpty())
-        assertFalse(func.isAsmSubroutine)
-        assertEquals(DataType.STR, func.parameters.single().type)
-        assertEquals(4, func.statements.size)
+        asmfunc.isAsmSubroutine shouldBe true
+        asmfunc.parameters.single().type shouldBe DataType.STR
+        asmfunc.statements.isEmpty() shouldBe true
+        func.isAsmSubroutine shouldBe false
+        func.parameters.single().type shouldBe DataType.STR
+        func.statements.size shouldBe 4
        val paramvar = func.statements[0] as VarDecl
-        assertEquals("thing", paramvar.name)
-        assertEquals(DataType.STR, paramvar.datatype)
+        paramvar.name shouldBe "thing"
+        paramvar.datatype shouldBe DataType.STR
        val assign = func.statements[2] as Assignment
-        assertEquals(listOf("t2"), assign.target.identifier!!.nameInSource)
-        assertTrue(assign.value is TypecastExpression, "str param in function body should not be transformed by normal compiler steps")
-        assertEquals(DataType.UWORD, (assign.value as TypecastExpression).type)
+        assign.target.identifier!!.nameInSource shouldBe listOf("t2")
+        withClue("str param in function body should not be transformed by normal compiler steps") {
+            assign.value shouldBe instanceOf<TypecastExpression>()
+        }
+        (assign.value as TypecastExpression).type shouldBe DataType.UWORD
        val call = func.statements[3] as FunctionCallStatement
-        assertEquals("asmfunc", call.target.nameInSource.single())
-        assertTrue(call.args.single() is IdentifierReference, "str param in function body should not be transformed by normal compiler steps")
-        assertEquals("thing", (call.args.single() as IdentifierReference).nameInSource.single())
+        call.target.nameInSource.single() shouldBe "asmfunc"
+        withClue("str param in function body should not be transformed by normal compiler steps") {
+            call.args.single() shouldBe instanceOf<IdentifierReference>()
+        }
+        (call.args.single() as IdentifierReference).nameInSource.single() shouldBe "thing"
    }

-    @Test
-    fun stringParameterAsmGen() {
+    test("stringParameterAsmGen") {
        val text = """
            main {
                sub start() {
@@ -94,30 +97,37 @@ class TestSubroutines {
        val mainBlock = module.statements.single() as Block
        val asmfunc = mainBlock.statements.filterIsInstance<Subroutine>().single { it.name=="asmfunc"}
        val func = mainBlock.statements.filterIsInstance<Subroutine>().single { it.name=="func"}
-        assertTrue(asmfunc.isAsmSubroutine)
-        assertEquals(DataType.STR, asmfunc.parameters.single().type)
-        assertTrue(asmfunc.statements.single() is Return)
-        assertFalse(func.isAsmSubroutine)
-        assertEquals(DataType.UWORD, func.parameters.single().type, "asmgen should have changed str to uword type")
-        assertTrue(asmfunc.statements.last() is Return)
+        asmfunc.isAsmSubroutine shouldBe true
+        asmfunc.parameters.single().type shouldBe DataType.STR
+        asmfunc.statements.single() shouldBe instanceOf<Return>()
+        func.isAsmSubroutine shouldBe false
+        withClue("asmgen should have changed str to uword type") {
+            func.parameters.single().type shouldBe DataType.UWORD
+        }
+        asmfunc.statements.last() shouldBe instanceOf<Return>()

-        assertEquals(5, func.statements.size)
-        assertTrue(func.statements[4] is Return)
+        func.statements.size shouldBe 5
+        func.statements[4] shouldBe instanceOf<Return>()
        val paramvar = func.statements[0] as VarDecl
-        assertEquals("thing", paramvar.name)
-        assertEquals(DataType.UWORD, paramvar.datatype, "pre-asmgen should have changed str to uword type")
+        paramvar.name shouldBe "thing"
+        withClue("pre-asmgen should have changed str to uword type") {
+            paramvar.datatype shouldBe DataType.UWORD
+        }
        val assign = func.statements[2] as Assignment
-        assertEquals(listOf("t2"), assign.target.identifier!!.nameInSource)
-        assertTrue(assign.value is IdentifierReference, "str param in function body should be treated as plain uword before asmgen")
-        assertEquals("thing", (assign.value as IdentifierReference).nameInSource.single())
+        assign.target.identifier!!.nameInSource shouldBe listOf("t2")
+        withClue("str param in function body should be treated as plain uword before asmgen") {
+            assign.value shouldBe instanceOf<IdentifierReference>()
+        }
+        (assign.value as IdentifierReference).nameInSource.single() shouldBe "thing"
        val call = func.statements[3] as FunctionCallStatement
-        assertEquals("asmfunc", call.target.nameInSource.single())
-        assertTrue(call.args.single() is IdentifierReference, "str param in function body should be treated as plain uword and not been transformed")
-        assertEquals("thing", (call.args.single() as IdentifierReference).nameInSource.single())
+        call.target.nameInSource.single() shouldBe "asmfunc"
+        withClue("str param in function body should be treated as plain uword and not been transformed") {
+            call.args.single() shouldBe instanceOf<IdentifierReference>()
+        }
+        (call.args.single() as IdentifierReference).nameInSource.single() shouldBe "thing"
    }

-    @Test
-    fun arrayParameterNotYetAllowed_ButShouldPerhapsBe() {
+    test("arrayParameterNotYetAllowed_ButShouldPerhapsBe") {
        // note: the *parser* accepts this as it is valid *syntax*,
        // however, it's not (yet) valid for the compiler
        val text = """
@@ -135,13 +145,12 @@ class TestSubroutines {

        val errors = ErrorReporterForTests()
        compileText(C64Target, false, text, errors, false).assertFailure("currently array dt in signature is invalid")     // TODO should not be invalid?
-        assertEquals(0, errors.warnings.size)
-        assertContains(errors.errors.single(), ".p8:9:16: Non-string pass-by-reference types cannot occur as a parameter type directly")
+        errors.warnings.size shouldBe 0
+        errors.errors.single() shouldContain ".p8:9:16: Non-string pass-by-reference types cannot occur as a parameter type directly"
    }

-    @Test
-    @Disabled("TODO: allow array parameter in signature")           // TODO allow this?
-    fun arrayParameter() {
+    // TODO allow this?
+    xtest("arrayParameter") {
        val text = """
            main {
                sub start() {
@@ -170,16 +179,15 @@ class TestSubroutines {
        val mainBlock = module.statements.single() as Block
        val asmfunc = mainBlock.statements.filterIsInstance<Subroutine>().single { it.name=="asmfunc"}
        val func = mainBlock.statements.filterIsInstance<Subroutine>().single { it.name=="func"}
-        assertTrue(asmfunc.isAsmSubroutine)
-        assertEquals(DataType.ARRAY_UB, asmfunc.parameters.single().type)
-        assertTrue(asmfunc.statements.isEmpty())
-        assertFalse(func.isAsmSubroutine)
-        assertEquals(DataType.ARRAY_UB, func.parameters.single().type)
-        assertTrue(func.statements.isEmpty())
+        asmfunc.isAsmSubroutine shouldBe true
+        asmfunc.parameters.single().type shouldBe DataType.ARRAY_UB
+        asmfunc.statements.isEmpty() shouldBe true
+        func.isAsmSubroutine shouldBe false
+        func.parameters.single().type shouldBe DataType.ARRAY_UB
+        func.statements.isEmpty() shouldBe true
    }

-    @Test
-    fun testUwordParameterAndNormalVarIndexedAsArrayWorkAsDirectMemoryRead() {
+    test("testUwordParameterAndNormalVarIndexedAsArrayWorkAsDirectMemoryRead") {
        val text="""
            main {
              sub thing(uword rr) {
@@ -201,29 +209,30 @@ class TestSubroutines {
        val module = result.program.toplevelModule
        val block = module.statements.single() as Block
        val thing = block.statements.filterIsInstance<Subroutine>().single {it.name=="thing"}
-        assertEquals("main", block.name)
-        assertEquals(10, thing.statements.size, "rr, xx, xx assign, yy, yy assign, other, other assign 0, zz, zz assign, return")
+        block.name shouldBe "main"
+        thing.statements.size shouldBe 10          // rr, xx, xx assign, yy, yy assign, other, other assign 0, zz, zz assign, return
        val xx = thing.statements[1] as VarDecl
-        assertNull(xx.value, "vardecl init values must have been moved to separate assignments")
+        withClue("vardecl init values must have been moved to separate assignments") {
+            xx.value shouldBe null
+        }
        val assignXX = thing.statements[2] as Assignment
        val assignYY = thing.statements[4] as Assignment
        val assignZZ = thing.statements[8] as Assignment
-        assertEquals(listOf("xx"), assignXX.target.identifier!!.nameInSource)
-        assertEquals(listOf("yy"), assignYY.target.identifier!!.nameInSource)
-        assertEquals(listOf("zz"), assignZZ.target.identifier!!.nameInSource)
+        assignXX.target.identifier!!.nameInSource shouldBe listOf("xx")
+        assignYY.target.identifier!!.nameInSource shouldBe listOf("yy")
+        assignZZ.target.identifier!!.nameInSource shouldBe listOf("zz")
        val valueXXexpr = (assignXX.value as DirectMemoryRead).addressExpression as BinaryExpression
        val valueYYexpr = (assignYY.value as DirectMemoryRead).addressExpression as BinaryExpression
        val valueZZexpr = (assignZZ.value as DirectMemoryRead).addressExpression as BinaryExpression
-        assertEquals(listOf("rr"), (valueXXexpr.left as IdentifierReference).nameInSource)
-        assertEquals(listOf("rr"), (valueYYexpr.left as IdentifierReference).nameInSource)
-        assertEquals(listOf("other"), (valueZZexpr.left as IdentifierReference).nameInSource)
-        assertEquals(1, (valueXXexpr.right as NumericLiteralValue).number.toInt())
-        assertEquals(2, (valueYYexpr.right as NumericLiteralValue).number.toInt())
-        assertEquals(3, (valueZZexpr.right as NumericLiteralValue).number.toInt())
+        (valueXXexpr.left as IdentifierReference).nameInSource shouldBe listOf("rr")
+        (valueYYexpr.left as IdentifierReference).nameInSource shouldBe listOf("rr")
+        (valueZZexpr.left as IdentifierReference).nameInSource shouldBe listOf("other")
+        (valueXXexpr.right as NumericLiteralValue).number.toInt() shouldBe 1
+        (valueYYexpr.right as NumericLiteralValue).number.toInt() shouldBe 2
+        (valueZZexpr.right as NumericLiteralValue).number.toInt() shouldBe 3
    }

-    @Test
-    fun testUwordParameterAndNormalVarIndexedAsArrayWorkAsMemoryWrite() {
+    test("testUwordParameterAndNormalVarIndexedAsArrayWorkAsMemoryWrite") {
        val text="""
            main {
              sub thing(uword rr) {
@@ -241,15 +250,15 @@ class TestSubroutines {
        val module = result.program.toplevelModule
        val block = module.statements.single() as Block
        val thing = block.statements.filterIsInstance<Subroutine>().single {it.name=="thing"}
-        assertEquals("main", block.name)
-        assertEquals(3, thing.statements.size, "rr, rr assign, return void")
+        block.name shouldBe "main"
+        thing.statements.size shouldBe 3   // "rr, rr assign, return void"
        val assignRR = thing.statements[1] as Assignment
-        assertEquals(42, (assignRR.value as NumericLiteralValue).number.toInt())
+        (assignRR.value as NumericLiteralValue).number.toInt() shouldBe 42
        val memwrite = assignRR.target.memoryAddress
-        assertNotNull(memwrite, "memwrite to set byte array value")
-        val addressExpr = memwrite.addressExpression as BinaryExpression
-        assertEquals(listOf("rr"), (addressExpr.left as IdentifierReference).nameInSource)
-        assertEquals("+", addressExpr.operator)
-        assertEquals(10, (addressExpr.right as NumericLiteralValue).number.toInt())
+        memwrite shouldNotBe null
+        val addressExpr = memwrite!!.addressExpression as BinaryExpression
+        (addressExpr.left as IdentifierReference).nameInSource shouldBe listOf("rr")
+        addressExpr.operator shouldBe "+"
+        (addressExpr.right as NumericLiteralValue).number.toInt() shouldBe 10
    }
-}
+})
@@ -1,7 +1,12 @@
 package prog8tests

-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.collections.shouldBeIn
+import io.kotest.matchers.collections.shouldNotBeIn
+import io.kotest.matchers.ints.shouldBeGreaterThan
+import io.kotest.matchers.shouldBe
 import prog8.ast.base.DataType
 import prog8.compiler.target.C64Target
 import prog8.compiler.target.Cx16Target
@@ -9,31 +14,9 @@ import prog8.compiler.target.c64.C64MachineDefinition.C64Zeropage
 import prog8.compiler.target.cx16.CX16MachineDefinition.CX16Zeropage
 import prog8.compilerinterface.*
 import prog8tests.helpers.ErrorReporterForTests
-import kotlin.test.assertEquals
-import kotlin.test.assertFailsWith
-import kotlin.test.assertFalse
-import kotlin.test.assertTrue


-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestAbstractZeropage {
-
-    @Test
-    fun testAbstractZeropage() {
-        val compTarget = DummyCompilationTarget()
-        val zp = DummyZeropage(
-            CompilationOptions(
-                OutputType.RAW,
-                LauncherType.NONE,
-                ZeropageType.FULL,
-                listOf((0x50..0x5f)),
-                false,
-                false,
-                compTarget
-            )
-        )
-        assertEquals(256-6-16, zp.free.size)
-    }
+class TestAbstractZeropage: FunSpec({

    class DummyCompilationTarget: ICompilationTarget {
        override val name: String = "dummy"
@@ -67,165 +50,172 @@ class TestAbstractZeropage {
        }
    }

-}
+
+    test("testAbstractZeropage") {
+        val compTarget = DummyCompilationTarget()
+        val zp = DummyZeropage(
+            CompilationOptions(
+                OutputType.RAW,
+                LauncherType.NONE,
+                ZeropageType.FULL,
+                listOf((0x50..0x5f)),
+                false,
+                false,
+                compTarget
+            )
+        )
+        zp.free.size shouldBe 256-6-16
+    }
+
+})


-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestC64Zeropage {
+class TestC64Zeropage: FunSpec({

-    private val errors = ErrorReporterForTests()
+    val errors = ErrorReporterForTests()

-    @Test
-    fun testNames() {
+    test("testNames") {
        val zp = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(), false, false, C64Target))

        zp.allocate("", DataType.UBYTE, null, errors)
        zp.allocate("", DataType.UBYTE, null, errors)
        zp.allocate("varname", DataType.UBYTE, null, errors)
-        assertFailsWith<AssertionError> {
+        shouldThrow<IllegalArgumentException> {
            zp.allocate("varname", DataType.UBYTE, null, errors)
        }
        zp.allocate("varname2", DataType.UBYTE, null, errors)
    }

-    @Test
-    fun testZpFloatEnable() {
+    test("testZpFloatEnable") {
        val zp = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, false, C64Target))
-        assertFailsWith<InternalCompilerException> {
+        shouldThrow<InternalCompilerException> {
            zp.allocate("", DataType.FLOAT, null, errors)
        }
        val zp2 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.DONTUSE, emptyList(), true, false, C64Target))
-        assertFailsWith<InternalCompilerException> {
+        shouldThrow<InternalCompilerException> {
            zp2.allocate("", DataType.FLOAT, null, errors)
        }
        val zp3 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FLOATSAFE, emptyList(), true, false, C64Target))
        zp3.allocate("", DataType.FLOAT, null, errors)
    }

-    @Test
-    fun testZpModesWithFloats() {
+    test("testZpModesWithFloats") {
        C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, false, C64Target))
        C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.KERNALSAFE, emptyList(), false, false, C64Target))
        C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(), false, false, C64Target))
        C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FLOATSAFE, emptyList(), false, false, C64Target))
        C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(), true, false, C64Target))
        C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FLOATSAFE, emptyList(), true, false, C64Target))
-        assertFailsWith<InternalCompilerException> {
+        shouldThrow<InternalCompilerException> {
            C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), true, false, C64Target))
        }
-        assertFailsWith<InternalCompilerException> {
+        shouldThrow<InternalCompilerException> {
            C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.KERNALSAFE, emptyList(), true, false, C64Target))
        }
    }

-    @Test
-    fun testZpDontuse() {
+    test("testZpDontuse") {
        val zp = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.DONTUSE, emptyList(), false, false, C64Target))
        println(zp.free)
-        assertEquals(0, zp.availableBytes())
-        assertFailsWith<InternalCompilerException> {
+        zp.availableBytes() shouldBe 0
+        shouldThrow<InternalCompilerException> {
            zp.allocate("", DataType.BYTE, null, errors)
        }
    }

-    @Test
-    fun testFreeSpacesBytes() {
+    test("testFreeSpacesBytes") {
        val zp1 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(), true, false, C64Target))
-        assertEquals(18, zp1.availableBytes())
+        zp1.availableBytes() shouldBe 18
        val zp2 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FLOATSAFE, emptyList(), false, false, C64Target))
-        assertEquals(85, zp2.availableBytes())
+        zp2.availableBytes() shouldBe 85
        val zp3 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.KERNALSAFE, emptyList(), false, false, C64Target))
-        assertEquals(125, zp3.availableBytes())
+        zp3.availableBytes() shouldBe 125
        val zp4 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, false, C64Target))
-        assertEquals(238, zp4.availableBytes())
+        zp4.availableBytes() shouldBe 238
        zp4.allocate("test", DataType.UBYTE, null, errors)
-        assertEquals(237, zp4.availableBytes())
+        zp4.availableBytes() shouldBe 237
        zp4.allocate("test2", DataType.UBYTE, null, errors)
-        assertEquals(236, zp4.availableBytes())
+        zp4.availableBytes() shouldBe 236
    }

-    @Test
-    fun testFreeSpacesWords() {
+    test("testFreeSpacesWords") {
        val zp1 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(), true, false, C64Target))
-        assertEquals(6, zp1.availableWords())
+        zp1.availableWords() shouldBe 6
        val zp2 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FLOATSAFE, emptyList(), false, false, C64Target))
-        assertEquals(38, zp2.availableWords())
+        zp2.availableWords() shouldBe 38
        val zp3 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.KERNALSAFE, emptyList(), false, false, C64Target))
-        assertEquals(57, zp3.availableWords())
+        zp3.availableWords() shouldBe 57
        val zp4 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, false, C64Target))
-        assertEquals(116, zp4.availableWords())
+        zp4.availableWords() shouldBe 116
        zp4.allocate("test", DataType.UWORD, null, errors)
-        assertEquals(115, zp4.availableWords())
+        zp4.availableWords() shouldBe 115
        zp4.allocate("test2", DataType.UWORD, null, errors)
-        assertEquals(114, zp4.availableWords())
+        zp4.availableWords() shouldBe 114
    }

-    @Test
-    fun testReservedSpace() {
+    test("testReservedSpace") {
        val zp1 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, false, C64Target))
-        assertEquals(238, zp1.availableBytes())
-        assertTrue(50 in zp1.free)
-        assertTrue(100 in zp1.free)
-        assertTrue(49 in zp1.free)
-        assertTrue(101 in zp1.free)
-        assertTrue(200 in zp1.free)
-        assertTrue(255 in zp1.free)
-        assertTrue(199 in zp1.free)
+        zp1.availableBytes() shouldBe 238
+        50 shouldBeIn zp1.free
+        100 shouldBeIn zp1.free
+        49 shouldBeIn zp1.free
+        101 shouldBeIn zp1.free
+        200 shouldBeIn zp1.free
+        255 shouldBeIn zp1.free
+        199 shouldBeIn zp1.free
        val zp2 = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, listOf(50 .. 100, 200..255), false, false, C64Target))
-        assertEquals(139, zp2.availableBytes())
-        assertFalse(50 in zp2.free)
-        assertFalse(100 in zp2.free)
-        assertTrue(49 in zp2.free)
-        assertTrue(101 in zp2.free)
-        assertFalse(200 in zp2.free)
-        assertFalse(255 in zp2.free)
-        assertTrue(199 in zp2.free)
+        zp2.availableBytes() shouldBe 139
+        50 shouldNotBeIn zp2.free
+        100 shouldNotBeIn zp2.free
+        49 shouldBeIn zp2.free
+        101 shouldBeIn zp2.free
+        200 shouldNotBeIn zp2.free
+        255 shouldNotBeIn zp2.free
+        199 shouldBeIn zp2.free
    }

-    @Test
-    fun testBasicsafeAllocation() {
+    test("testBasicsafeAllocation") {
        val zp = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(), true, false, C64Target))
-        assertEquals(18, zp.availableBytes())
-        assertTrue(zp.hasByteAvailable())
-        assertTrue(zp.hasWordAvailable())
+        zp.availableBytes() shouldBe 18
+        zp.hasByteAvailable() shouldBe true
+        zp.hasWordAvailable() shouldBe true

-        assertFailsWith<ZeropageDepletedError> {
+        shouldThrow<ZeropageDepletedError> {
            // in regular zp there aren't 5 sequential bytes free
            zp.allocate("", DataType.FLOAT, null, errors)
        }

        for (i in 0 until zp.availableBytes()) {
            val loc = zp.allocate("", DataType.UBYTE, null, errors)
-            assertTrue(loc > 0)
+            loc shouldBeGreaterThan 0
        }
-        assertEquals(0, zp.availableBytes())
-        assertFalse(zp.hasByteAvailable())
-        assertFalse(zp.hasWordAvailable())
-        assertFailsWith<ZeropageDepletedError> {
+        zp.availableBytes() shouldBe 0
+        zp.hasByteAvailable() shouldBe false
+        zp.hasWordAvailable() shouldBe false
+        shouldThrow<ZeropageDepletedError> {
            zp.allocate("", DataType.UBYTE, null, errors)
        }
-        assertFailsWith<ZeropageDepletedError> {
+        shouldThrow<ZeropageDepletedError> {
            zp.allocate("", DataType.UWORD, null, errors)
        }
    }

-    @Test
-    fun testFullAllocation() {
+    test("testFullAllocation") {
        val zp = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, false, C64Target))
-        assertEquals(238, zp.availableBytes())
-        assertTrue(zp.hasByteAvailable())
-        assertTrue(zp.hasWordAvailable())
+        zp.availableBytes() shouldBe 238
+        zp.hasByteAvailable() shouldBe true
+        zp.hasWordAvailable() shouldBe true
        val loc = zp.allocate("", DataType.UWORD, null, errors)
-        assertTrue(loc > 3)
-        assertFalse(loc in zp.free)
+        loc shouldBeGreaterThan 3
+        loc shouldNotBeIn zp.free
        val num = zp.availableBytes() / 2

        for(i in 0..num-4) {
            zp.allocate("", DataType.UWORD, null, errors)
        }
-        assertEquals(6,zp.availableBytes())
+        zp.availableBytes() shouldBe 6

-        assertFailsWith<ZeropageDepletedError> {
+        shouldThrow<ZeropageDepletedError> {
            // can't allocate because no more sequential bytes, only fragmented
            zp.allocate("", DataType.UWORD, null, errors)
        }
@@ -234,88 +224,85 @@ class TestC64Zeropage {
            zp.allocate("", DataType.UBYTE, null, errors)
        }

-        assertEquals(0, zp.availableBytes())
-        assertFalse(zp.hasByteAvailable())
-        assertFalse(zp.hasWordAvailable())
-        assertFailsWith<ZeropageDepletedError> {
+        zp.availableBytes() shouldBe 0
+        zp.hasByteAvailable() shouldBe false
+        zp.hasWordAvailable() shouldBe false
+        shouldThrow<ZeropageDepletedError> {
            // no more space
            zp.allocate("", DataType.UBYTE, null, errors)
        }
    }

-    @Test
-    fun testEfficientAllocation() {
+    test("testEfficientAllocation") {
        val zp = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(),  true, false, C64Target))
-        assertEquals(18, zp.availableBytes())
-        assertEquals(0x04, zp.allocate("", DataType.WORD, null, errors))
-        assertEquals(0x06, zp.allocate("", DataType.UBYTE, null, errors))
-        assertEquals(0x0a, zp.allocate("", DataType.UBYTE, null, errors))
-        assertEquals(0x9b, zp.allocate("", DataType.UWORD, null, errors))
-        assertEquals(0x9e, zp.allocate("", DataType.UWORD, null, errors))
-        assertEquals(0xa5, zp.allocate("", DataType.UWORD, null, errors))
-        assertEquals(0xb0, zp.allocate("", DataType.UWORD, null, errors))
-        assertEquals(0xbe, zp.allocate("", DataType.UWORD, null, errors))
-        assertEquals(0x0e, zp.allocate("", DataType.UBYTE, null, errors))
-        assertEquals(0x92, zp.allocate("", DataType.UBYTE, null, errors))
-        assertEquals(0x96, zp.allocate("", DataType.UBYTE, null, errors))
-        assertEquals(0xf9, zp.allocate("", DataType.UBYTE, null, errors))
-        assertEquals(0, zp.availableBytes())
+        zp.availableBytes() shouldBe 18
+        zp.allocate("", DataType.WORD, null, errors) shouldBe 0x04
+        zp.allocate("", DataType.UBYTE, null, errors) shouldBe 0x06
+        zp.allocate("", DataType.UBYTE, null, errors) shouldBe 0x0a
+        zp.allocate("", DataType.UWORD, null, errors) shouldBe 0x9b
+        zp.allocate("", DataType.UWORD, null, errors) shouldBe 0x9e
+        zp.allocate("", DataType.UWORD, null, errors) shouldBe 0xa5
+        zp.allocate("", DataType.UWORD, null, errors) shouldBe 0xb0
+        zp.allocate("", DataType.UWORD, null, errors) shouldBe 0xbe
+        zp.allocate("", DataType.UBYTE, null, errors) shouldBe 0x0e
+        zp.allocate("", DataType.UBYTE, null, errors) shouldBe 0x92
+        zp.allocate("", DataType.UBYTE, null, errors) shouldBe 0x96
+        zp.allocate("", DataType.UBYTE, null, errors) shouldBe 0xf9
+        zp.availableBytes() shouldBe 0
    }

-    @Test
-    fun testReservedLocations() {
+    test("testReservedLocations") {
        val zp = C64Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(), false, false, C64Target))
-        assertEquals(zp.SCRATCH_REG, zp.SCRATCH_B1+1, "zp _B1 and _REG must be next to each other to create a word")
+        withClue("zp _B1 and _REG must be next to each other to create a word") {
+            zp.SCRATCH_B1 + 1 shouldBe zp.SCRATCH_REG
+        }
    }
-}
+})


-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestCx16Zeropage {
-    private val errors = ErrorReporterForTests()
+class TestCx16Zeropage: FunSpec({
+    val errors = ErrorReporterForTests()

-    @Test
-    fun testReservedLocations() {
+    test("testReservedLocations") {
        val zp = CX16Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(), false, false, Cx16Target))
-        assertEquals(zp.SCRATCH_REG, zp.SCRATCH_B1+1, "zp _B1 and _REG must be next to each other to create a word")
+        withClue("zp _B1 and _REG must be next to each other to create a word") {
+            zp.SCRATCH_B1 + 1 shouldBe zp.SCRATCH_REG
+        }
    }

-    @Test
-    fun testFreeSpacesBytes() {
+    test("testFreeSpacesBytes") {
        val zp1 = CX16Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(), true, false, Cx16Target))
-        assertEquals(88, zp1.availableBytes())
+        zp1.availableBytes() shouldBe 88
        val zp2 = CX16Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.KERNALSAFE, emptyList(), false, false, Cx16Target))
-        assertEquals(175, zp2.availableBytes())
+        zp2.availableBytes() shouldBe 175
        val zp3 = CX16Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, false, Cx16Target))
-        assertEquals(216, zp3.availableBytes())
+        zp3.availableBytes() shouldBe 216
        zp3.allocate("test", DataType.UBYTE, null, errors)
-        assertEquals(215, zp3.availableBytes())
+        zp3.availableBytes() shouldBe 215
        zp3.allocate("test2", DataType.UBYTE, null, errors)
-        assertEquals(214, zp3.availableBytes())
+        zp3.availableBytes() shouldBe 214
    }

-    @Test
-    fun testFreeSpacesWords() {
+    test("testFreeSpacesWords") {
        val zp1 = CX16Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, false, Cx16Target))
-        assertEquals(108, zp1.availableWords())
+        zp1.availableWords() shouldBe 108
        val zp2 = CX16Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.KERNALSAFE, emptyList(), false, false, Cx16Target))
-        assertEquals(87, zp2.availableWords())
+        zp2.availableWords() shouldBe 87
        val zp3 = CX16Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.BASICSAFE, emptyList(), true, false, Cx16Target))
-        assertEquals(44, zp3.availableWords())
+        zp3.availableWords() shouldBe 44
        zp3.allocate("test", DataType.UWORD, null, errors)
-        assertEquals(43, zp3.availableWords())
+        zp3.availableWords() shouldBe 43
        zp3.allocate("test2", DataType.UWORD, null, errors)
-        assertEquals(42, zp3.availableWords())
+        zp3.availableWords() shouldBe 42
    }

-    @Test
-    fun testReservedSpace() {
+    test("testReservedSpace") {
        val zp1 = CX16Zeropage(CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.FULL, emptyList(), false, false, Cx16Target))
-        assertEquals(216, zp1.availableBytes())
-        assertTrue(0x22 in zp1.free)
-        assertTrue(0x80 in zp1.free)
-        assertTrue(0xff in zp1.free)
-        assertFalse(0x02 in zp1.free)
-        assertFalse(0x21 in zp1.free)
+        zp1.availableBytes() shouldBe 216
+        0x22 shouldBeIn zp1.free
+        0x80 shouldBeIn zp1.free
+        0xff shouldBeIn zp1.free
+        0x02 shouldNotBeIn zp1.free
+        0x21 shouldNotBeIn zp1.free
    }
-}
+})
@@ -5,7 +5,6 @@ import prog8.compilerinterface.IErrorReporter

 internal class ErrorReporterForTests(private val throwExceptionAtReportIfErrors: Boolean=true): IErrorReporter {

-
    val errors = mutableListOf<String>()
    val warnings = mutableListOf<String>()

@@ -1,24 +1,31 @@
 package prog8tests.helpers

+import io.kotest.assertions.withClue
+import io.kotest.matchers.shouldBe
+import prog8.ast.Program
 import prog8.compiler.CompilationResult
 import prog8.compiler.compileProgram
-import prog8.compilerinterface.ICompilationTarget
-import prog8.compilerinterface.IErrorReporter
+import prog8.compiler.target.C64Target
+import prog8.compiler.target.c64.C64MachineDefinition
+import prog8.compiler.target.cpu6502.codegen.AsmGen
+import prog8.compilerinterface.*
 import prog8tests.ast.helpers.assumeReadableFile
 import prog8tests.ast.helpers.outputDir
 import java.nio.file.Path
 import kotlin.io.path.name
-import kotlin.test.assertFalse
-import kotlin.test.assertTrue


 internal fun CompilationResult.assertSuccess(description: String = ""): CompilationResult {
-    assertTrue(success, "expected successful compilation but failed $description")
+    withClue("expected successful compilation but failed $description") {
+        success shouldBe true
+    }
    return this
 }

 internal fun CompilationResult.assertFailure(description: String = ""): CompilationResult {
-    assertFalse(success, "expected failure to compile but succeeded $description")
+    withClue("expected failure to compile but succeeded $description") {
+        success shouldBe false
+    }
    return this
 }

@@ -33,14 +40,15 @@ internal fun compileFile(
    fileName: String,
    outputDir: Path = prog8tests.ast.helpers.outputDir,
    errors: IErrorReporter? = null,
-    writeAssembly: Boolean = true
+    writeAssembly: Boolean = true,
+    optFloatExpr: Boolean = true
 ) : CompilationResult {
    val filepath = fileDir.resolve(fileName)
    assumeReadableFile(filepath)
    return compileProgram(
        filepath,
        optimize,
-        optimizeFloatExpressions = false,
+        optimizeFloatExpressions = optFloatExpr,
        writeAssembly = writeAssembly,
        slowCodegenWarnings = false,
        quietAssembler = true,
@@ -61,10 +69,23 @@ internal fun compileText(
    optimize: Boolean,
    sourceText: String,
    errors: IErrorReporter? = null,
-    writeAssembly: Boolean = true
+    writeAssembly: Boolean = true,
+    optFloatExpr: Boolean = true
 ) : CompilationResult {
    val filePath = outputDir.resolve("on_the_fly_test_" + sourceText.hashCode().toUInt().toString(16) + ".p8")
    // we don't assumeNotExists(filePath) - should be ok to just overwrite it
    filePath.toFile().writeText(sourceText)
-    return compileFile(platform, optimize, filePath.parent, filePath.name, errors=errors, writeAssembly=writeAssembly)
+    return compileFile(platform, optimize, filePath.parent, filePath.name, errors=errors, writeAssembly=writeAssembly, optFloatExpr = optFloatExpr)
+}
+
+
+internal fun generateAssembly(
+    program: Program,
+    options: CompilationOptions? = null
+): IAssemblyProgram {
+    val coptions = options ?: CompilationOptions(OutputType.RAW, LauncherType.NONE, ZeropageType.DONTUSE, emptyList(), true, true, C64Target)
+    val zp = C64MachineDefinition.C64Zeropage(coptions)
+    coptions.compTarget.machine.zeropage=zp
+    val asmgen = AsmGen(program, ErrorReporterForTests(), zp, coptions, C64Target, outputDir)
+    return asmgen.compileToAssembly()
 }
@@ -1,9 +1,9 @@
 plugins {
-    id 'java'
+    id "java"
    id "org.jetbrains.kotlin.jvm"
+    id "io.kotest" version "0.3.8"
 }

-
 java {
    toolchain {
        languageVersion = JavaLanguageVersion.of(javaVersion)
@@ -15,10 +15,7 @@ dependencies {
    implementation "com.michael-bull.kotlin-result:kotlin-result-jvm:1.1.12"
    implementation project(':parser')

-    testImplementation "org.jetbrains.kotlin:kotlin-test-junit5"
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.2'
-    testImplementation 'org.hamcrest:hamcrest:2.2'
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.2'
+    testImplementation 'io.kotest:kotest-runner-junit5-jvm:4.6.3'
 }

 configurations.all {
@@ -42,7 +39,6 @@ sourceSets {
 }

 test {
-    // Enable JUnit 5 (Gradle 4.6+).
    useJUnitPlatform()

    // Always run tests, even when nothing changed.
@@ -13,8 +13,8 @@
    <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
    <orderEntry type="module" module-name="parser" />
    <orderEntry type="library" name="antlr.antlr4" level="project" />
-    <orderEntry type="library" name="hamcrest" level="project" />
-    <orderEntry type="library" name="junit.jupiter" level="project" />
    <orderEntry type="library" name="michael.bull.kotlin.result.jvm" level="project" />
+    <orderEntry type="library" name="io.kotest.assertions.core.jvm" level="project" />
+    <orderEntry type="library" name="io.kotest.runner.junit5.jvm" level="project" />
  </component>
 </module>
@@ -62,6 +62,18 @@ sealed class Expression: Node {
            else -> other==this
        }
    }
+
+    fun typecastTo(targetDt: DataType, sourceDt: DataType, implicit: Boolean=false): Pair<Boolean, Expression> {
+        require(sourceDt!=DataType.UNDEFINED && targetDt!=DataType.UNDEFINED)
+        if(sourceDt==targetDt)
+            return Pair(false, this)
+        if(this is TypecastExpression) {
+            this.type = targetDt
+            return Pair(false, this)
+        }
+        val typecast = TypecastExpression(this, targetDt, implicit, this.position)
+        return Pair(true, typecast)
+    }
 }


@@ -106,7 +118,7 @@ class PrefixExpression(val operator: String, var expression: Expression, overrid
        }
    }

-    override val isSimple = false
+    override val isSimple = true

    override fun toString(): String {
        return "Prefix($operator $expression)"
@@ -158,7 +170,7 @@ class BinaryExpression(var left: Expression, var operator: String, var right: Ex
                            commonDatatype(
                                leftDt.getOr(DataType.BYTE),
                                rightDt.getOr(DataType.BYTE),
-                                null, null
+                                null, "", null
                            ).first
                        )
                    } catch (x: FatalAstException) {
@@ -180,7 +192,7 @@ class BinaryExpression(var left: Expression, var operator: String, var right: Ex

    companion object {
        fun commonDatatype(leftDt: DataType, rightDt: DataType,
-                           left: Expression?, right: Expression?): Pair<DataType, Expression?> {
+                           left: Expression?, operator: String, right: Expression?): Pair<DataType, Expression?> {
            // byte + byte -> byte
            // byte + word -> word
            // word + byte -> word
@@ -0,0 +1,8 @@
+package prog8tests.ast
+
+import io.kotest.core.config.AbstractProjectConfig
+import kotlin.math.max
+
+object ProjectConfig : AbstractProjectConfig() {
+    override val parallelism = max(2, Runtime.getRuntime().availableProcessors() / 2)
+}
@@ -1,7 +1,8 @@
 package prog8tests.ast

-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.assertions.fail
+import io.kotest.core.spec.style.AnnotationSpec
+import io.kotest.matchers.string.shouldContain
 import prog8.ast.AstToSourceTextConverter
 import prog8.ast.Module
 import prog8.ast.Program
@@ -12,11 +13,9 @@ import prog8.parser.SourceCode
 import prog8tests.ast.helpers.DummyFunctions
 import prog8tests.ast.helpers.DummyMemsizer
 import prog8tests.ast.helpers.DummyStringEncoder
-import kotlin.test.assertContains


-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestAstToSourceText {
+class TestAstToSourceText: AnnotationSpec() {

    private fun generateP8(module: Module) : String {
        val program = Program("test", DummyFunctions, DummyMemsizer, DummyStringEncoder)
@@ -35,8 +34,7 @@ class TestAstToSourceText {
            val parsedAgain = parseModule(SourceCode.Text(generatedText))
            return Pair(generatedText, parsedAgain)
        } catch (e: ParseError) {
-            assert(false) { "should produce valid Prog8 but threw $e" }
-            throw e
+            fail("should produce valid Prog8 but threw $e")
        }
    }

@@ -44,24 +42,21 @@ class TestAstToSourceText {
    fun testMentionsInternedStringsModule() {
        val orig = SourceCode.Text("\n")
        val (txt, _) = roundTrip(parseModule(orig))
-        // assertContains has *actual* first!
-        assertContains(txt, Regex(";.*$internedStringsModuleName"))
+        txt shouldContain Regex(";.*$internedStringsModuleName")
    }

    @Test
    fun testImportDirectiveWithLib() {
        val orig = SourceCode.Text("%import textio\n")
        val (txt, _) = roundTrip(parseModule(orig))
-        // assertContains has *actual* first!
-        assertContains(txt, Regex("%import +textio"))
+        txt shouldContain Regex("%import +textio")
    }

    @Test
    fun testImportDirectiveWithUserModule() {
        val orig = SourceCode.Text("%import my_own_stuff\n")
        val (txt, _) = roundTrip(parseModule(orig))
-        // assertContains has *actual* first!
-        assertContains(txt, Regex("%import +my_own_stuff"))
+        txt shouldContain Regex("%import +my_own_stuff")
    }


@@ -73,8 +68,7 @@ class TestAstToSourceText {
            }
        """)
        val (txt, _) = roundTrip(parseModule(orig))
-        // assertContains has *actual* first!
-        assertContains(txt, Regex("str +s += +\"fooBar\\\\n\""))
+        txt shouldContain Regex("str +s += +\"fooBar\\\\n\"")
    }

    @Test
@@ -85,8 +79,7 @@ class TestAstToSourceText {
            }
        """)
        val (txt, _) = roundTrip(parseModule(orig))
-        // assertContains has *actual* first!
-        assertContains(txt, Regex("str +sAlt += +@\"fooBar\\\\n\""))
+        txt shouldContain Regex("str +sAlt += +@\"fooBar\\\\n\"")
    }

    @Test
@@ -97,8 +90,7 @@ class TestAstToSourceText {
            }
        """)
        val (txt, _) = roundTrip(parseModule(orig))
-        // assertContains has *actual* first!
-        assertContains(txt, Regex("ubyte +c += +'x'"), "char literal")
+        txt shouldContain Regex("ubyte +c += +'x'")
    }

    @Test
@@ -109,8 +101,7 @@ class TestAstToSourceText {
            }
        """)
        val (txt, _) = roundTrip(parseModule(orig))
-        // assertContains has *actual* first!
-        assertContains(txt, Regex("ubyte +cAlt += +@'x'"), "alt char literal")
+        txt shouldContain Regex("ubyte +cAlt += +@'x'")
    }

 }
@@ -1,18 +1,21 @@
 package prog8tests.ast

-import org.junit.jupiter.api.Nested
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.assertions.fail
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.shouldNotBe
+import io.kotest.matchers.string.shouldContain
+import io.kotest.matchers.string.shouldStartWith
+import io.kotest.matchers.types.instanceOf
 import prog8.ast.IFunctionCall
 import prog8.ast.Module
 import prog8.ast.Node
 import prog8.ast.Program
 import prog8.ast.base.DataType
 import prog8.ast.base.Position
-import prog8.ast.expressions.CharLiteral
-import prog8.ast.expressions.NumericLiteralValue
-import prog8.ast.expressions.RangeExpr
-import prog8.ast.expressions.StringLiteralValue
+import prog8.ast.expressions.*
 import prog8.ast.statements.*
 import prog8.parser.ParseError
 import prog8.parser.Prog8Parser.parseModule
@@ -24,39 +27,30 @@ import kotlin.io.path.Path
 import kotlin.io.path.isRegularFile
 import kotlin.io.path.name
 import kotlin.io.path.nameWithoutExtension
-import kotlin.test.*


-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestProg8Parser {
+class TestProg8Parser: FunSpec( {

-    @Nested
-    inner class Newline {
+    context("Newline at end") {
+        test("is not required - #40, fixed by #45") {
+            val nl = "\n" // say, Unix-style (different flavours tested elsewhere)
+            val src = SourceCode.Text("foo {" + nl + "}")   // source ends with '}' (= NO newline, issue #40)

-        @Nested
-        inner class AtEnd {
-
-            @Test
-            fun `is not required - #40, fixed by #45`() {
-                val nl = "\n" // say, Unix-style (different flavours tested elsewhere)
-                val src = SourceCode.Text("foo {" + nl + "}")   // source ends with '}' (= NO newline, issue #40)
-
-                // #40: Prog8ANTLRParser would report (throw) "missing <EOL> at '<EOF>'"
-                val module = parseModule(src)
-                assertEquals(1, module.statements.size)
-            }
-
-            @Test
-            fun `is still accepted - #40, fixed by #45`() {
-                val nl = "\n" // say, Unix-style (different flavours tested elsewhere)
-                val srcText = "foo {" + nl + "}" + nl  // source does end with a newline (issue #40)
-                val module = parseModule(SourceCode.Text(srcText))
-                assertEquals(1, module.statements.size)
-            }
+            // #40: Prog8ANTLRParser would report (throw) "missing <EOL> at '<EOF>'"
+            val module = parseModule(src)
+            module.statements.size shouldBe 1
        }

-        @Test
-        fun `is required after each block except the last`() {
+        test("is still accepted - #40, fixed by #45") {
+            val nl = "\n" // say, Unix-style (different flavours tested elsewhere)
+            val srcText = "foo {" + nl + "}" + nl  // source does end with a newline (issue #40)
+            val module = parseModule(SourceCode.Text(srcText))
+            module.statements.size shouldBe 1
+        }
+    }
+
+    context("Newline") {
+        test("is required after each block except the last") {
            val nl = "\n" // say, Unix-style (different flavours tested elsewhere)

            // BAD: 2nd block `bar` does NOT start on new line; however, there's is a nl at the very end
@@ -65,22 +59,21 @@ class TestProg8Parser {
            // GOOD: 2nd block `bar` does start on a new line; however, a nl at the very end ain't needed
            val srcGood = "foo {" + nl + "}" + nl + "bar {" + nl + "}"

-            assertFailsWith<ParseError> { parseModule(SourceCode.Text(srcBad)) }
+            shouldThrow<ParseError> { parseModule(SourceCode.Text(srcBad)) }
            val module = parseModule(SourceCode.Text(srcGood))
-            assertEquals(2, module.statements.size)
+            module.statements.size shouldBe 2
        }

-        @Test
-        fun `is required between two Blocks or Directives - #47`() {
+        test("is required between two Blocks or Directives - #47") {
            // block and block
-            assertFailsWith<ParseError>{ parseModule(SourceCode.Text("""
+            shouldThrow<ParseError>{ parseModule(SourceCode.Text("""
                blockA {
                } blockB {            
                }            
            """)) }

            // block and directive
-            assertFailsWith<ParseError>{ parseModule(SourceCode.Text("""
+            shouldThrow<ParseError>{ parseModule(SourceCode.Text("""
                blockB {            
                } %import textio            
            """)) }
@@ -89,18 +82,17 @@ class TestProg8Parser {
            // Leaving them in anyways.

            // dir and block
-            assertFailsWith<ParseError>{ parseModule(SourceCode.Text("""
+            shouldThrow<ParseError>{ parseModule(SourceCode.Text("""
                %import textio blockB {            
                }            
            """)) }

-            assertFailsWith<ParseError>{ parseModule(SourceCode.Text("""
+            shouldThrow<ParseError>{ parseModule(SourceCode.Text("""
                %import textio %import syslib            
            """)) }
        }

-        @Test
-        fun `can be Win, Unix or mixed, even mixed`() {
+        test("can be Win, Unix or mixed, even mixed") {
            val nlWin = "\r\n"
            val nlUnix = "\n"
            val nlMac = "\r"
@@ -124,15 +116,13 @@ class TestProg8Parser {
                nlUnix      // end with newline (see testModuleSourceNeedNotEndWithNewline)

            val module = parseModule(SourceCode.Text(srcText))
-            assertEquals(2, module.statements.size)
+            module.statements.size shouldBe 2
        }
    }

-    @Nested
-    inner class EOLsInterleavedWithComments {
+    context("EOLsInterleavedWithComments") {

-        @Test
-        fun `are ok before first block - #47`() {
+        test("are ok before first block - #47") {
            // issue: #47
            val srcText = """
                ; comment
@@ -143,11 +133,10 @@ class TestProg8Parser {
                }
            """
            val module = parseModule(SourceCode.Text(srcText))
-            assertEquals(1, module.statements.size)
+            module.statements.size shouldBe 1
        }

-        @Test
-        fun `are ok between blocks - #47`() {
+        test("are ok between blocks - #47") {
            // issue: #47
            val srcText = """
                blockA {
@@ -160,11 +149,10 @@ class TestProg8Parser {
                }
            """
            val module = parseModule(SourceCode.Text(srcText))
-            assertEquals(2, module.statements.size)
+            module.statements.size shouldBe 2
        }

-        @Test
-        fun `are ok after last block - #47`() {
+        test("are ok after last block - #47") {
            // issue: #47
            val srcText = """
                blockA {            
@@ -175,45 +163,36 @@ class TestProg8Parser {
                
            """
            val module = parseModule(SourceCode.Text(srcText))
-            assertEquals(1, module.statements.size)
+            module.statements.size shouldBe 1
        }
    }

-
-    @Nested
-    inner class ImportDirectives {
-        @Test
-        fun `should not be looked into by the parser`() {
+    context("ImportDirectives") {
+        test("should not be looked into by the parser") {
            val importedNoExt = assumeNotExists(fixturesDir, "i_do_not_exist")
            assumeNotExists(fixturesDir, "i_do_not_exist.p8")
            val text = "%import ${importedNoExt.name}"
            val module = parseModule(SourceCode.Text(text))

-            assertEquals(1, module.statements.size)
+            module.statements.size shouldBe 1
        }
    }

-
-    @Nested
-    inner class EmptySourcecode {
-        @Test
-        fun `from an empty string should result in empty Module`() {
+    context("EmptySourcecode") {
+        test("from an empty string should result in empty Module") {
            val module = parseModule(SourceCode.Text(""))
-            assertEquals(0, module.statements.size)
+            module.statements.size shouldBe 0
        }

-        @Test
-        fun `from an empty file should result in empty Module`() {
+        test("from an empty file should result in empty Module") {
            val path = assumeReadableFile(fixturesDir, "empty.p8")
            val module = parseModule(SourceCode.File(path))
-            assertEquals(0, module.statements.size)
+            module.statements.size shouldBe 0
        }
    }

-    @Nested
-    inner class NameOfModule {
-        @Test
-        fun `parsed from a string`() {
+    context("NameOfModule") {
+        test("parsed from a string") {
            val srcText = """
                main {
                }
@@ -221,21 +200,19 @@ class TestProg8Parser {
            val module = parseModule(SourceCode.Text(srcText))

            // Note: assertContains has *actual* as first param
-            assertContains(module.name, Regex("^<String@[0-9a-f\\-]+>$"))
+            module.name shouldContain Regex("^<String@[0-9a-f\\-]+>$")
        }

-        @Test
-        fun `parsed from a file`() {
+        test("parsed from a file") {
            val path = assumeReadableFile(fixturesDir, "simple_main.p8")
            val module = parseModule(SourceCode.File(path))
-            assertEquals(path.nameWithoutExtension, module.name)
+            module.name shouldBe path.nameWithoutExtension
        }
    }

-    @Nested
-    inner class PositionOfAstNodesAndParseErrors {
+    context("PositionOfAstNodesAndParseErrors") {

-        private fun assertPosition(
+        fun assertPosition(
            actual: Position,
            expFile: String? = null,
            expLine: Int? = null,
@@ -243,13 +220,13 @@ class TestProg8Parser {
            expEndCol: Int? = null
        ) {
            require(!listOf(expLine, expStartCol, expEndCol).all { it == null })
-            if (expLine != null) assertEquals(expLine, actual.line, ".position.line (1-based)")
-            if (expStartCol != null) assertEquals(expStartCol, actual.startCol, ".position.startCol (0-based)")
-            if (expEndCol != null) assertEquals(expEndCol, actual.endCol, ".position.endCol (0-based)")
-            if (expFile != null) assertEquals(expFile, actual.file, ".position.file")
+            if (expLine != null) actual.line shouldBe expLine
+            if (expStartCol != null) actual.startCol shouldBe expStartCol
+            if (expEndCol != null) actual.endCol shouldBe expEndCol
+            if (expFile != null) actual.file shouldBe expFile
        }

-        private fun assertPosition(
+        fun assertPosition(
            actual: Position,
            expFile: Regex? = null,
            expLine: Int? = null,
@@ -257,14 +234,13 @@ class TestProg8Parser {
            expEndCol: Int? = null
        ) {
            require(!listOf(expLine, expStartCol, expEndCol).all { it == null })
-            if (expLine != null) assertEquals(expLine, actual.line, ".position.line (1-based)")
-            if (expStartCol != null) assertEquals(expStartCol, actual.startCol, ".position.startCol (0-based)")
-            if (expEndCol != null) assertEquals(expEndCol, actual.endCol, ".position.endCol (0-based)")
-            // Note: assertContains expects *actual* value first
-            if (expFile != null) assertContains(actual.file, expFile, ".position.file")
+            if (expLine != null) actual.line shouldBe expLine
+            if (expStartCol != null) actual.startCol shouldBe expStartCol
+            if (expEndCol != null) actual.endCol shouldBe expEndCol
+            if (expFile != null) actual.file shouldContain expFile
        }

-        private fun assertPositionOf(
+        fun assertPositionOf(
            actual: Node,
            expFile: String? = null,
            expLine: Int? = null,
@@ -273,7 +249,7 @@ class TestProg8Parser {
        ) =
            assertPosition(actual.position, expFile, expLine, expStartCol, expEndCol)

-        private fun assertPositionOf(
+        fun assertPositionOf(
            actual: Node,
            expFile: Regex? = null,
            expLine: Int? = null,
@@ -283,24 +259,21 @@ class TestProg8Parser {
            assertPosition(actual.position, expFile, expLine, expStartCol, expEndCol)


-        @Test
-        fun `in ParseError from bad string source code`() {
+        test("in ParseError from bad string source code") {
            val srcText = "bad * { }\n"

-            val e = assertFailsWith<ParseError> { parseModule(SourceCode.Text(srcText)) }
+            val e = shouldThrow<ParseError> { parseModule(SourceCode.Text(srcText)) }
            assertPosition(e.position, Regex("^<String@[0-9a-f\\-]+>$"), 1, 4, 4)
        }

-        @Test
-        fun `in ParseError from bad file source code`() {
+        test("in ParseError from bad file source code") {
            val path = assumeReadableFile(fixturesDir, "file_with_syntax_error.p8")

-            val e = assertFailsWith<ParseError> { parseModule(SourceCode.File(path)) }
+            val e = shouldThrow<ParseError> { parseModule(SourceCode.File(path)) }
            assertPosition(e.position, SourceCode.relative(path).toString(), 2, 6)
        }

-        @Test
-        fun  `of Module parsed from a string`() {
+        test("of Module parsed from a string") {
            val srcText = """
                main {
                }
@@ -309,15 +282,13 @@ class TestProg8Parser {
            assertPositionOf(module, Regex("^<String@[0-9a-f\\-]+>$"), 1, 0)
        }

-        @Test
-        fun  `of Module parsed from a file`() {
+        test("of Module parsed from a file") {
            val path = assumeReadableFile(fixturesDir, "simple_main.p8")
            val module = parseModule(SourceCode.File(path))
            assertPositionOf(module, SourceCode.relative(path).toString(), 1, 0)
        }

-        @Test
-        fun `of non-root Nodes parsed from file`() {
+        test("of non-root Nodes parsed from file") {
            val path = assumeReadableFile(fixturesDir, "simple_main.p8")

            val module = parseModule(SourceCode.File(path))
@@ -329,9 +300,7 @@ class TestProg8Parser {
            assertPositionOf(startSub, mpf, 3, 4, 6)
        }

-
-        @Test
-        fun `of non-root Nodes parsed from a string`() {
+        test("of non-root Nodes parsed from a string") {
            val srcText = """
                %zeropage basicsafe
                main {
@@ -369,20 +338,30 @@ class TestProg8Parser {
        }
    }

-    @Nested
-    inner class PositionFile {
-        @Test
-        fun `isn't absolute for filesystem paths`() {
-            val path = assumeReadableFile(fixturesDir, "simple_main.p8")
-            val module = parseModule(SourceCode.File(path))
-            assertSomethingForAllNodes(module) {
-                assertFalse(Path(it.position.file).isAbsolute)
-                assertTrue(Path(it.position.file).isRegularFile())
+    context("PositionFile") {
+        fun assertSomethingForAllNodes(module: Module, asserter: (Node) -> Unit) {
+            asserter(module)
+            module.statements.forEach(asserter)
+            module.statements.filterIsInstance<Block>().forEach { b ->
+                asserter(b)
+                b.statements.forEach(asserter)
+                b.statements.filterIsInstance<Subroutine>().forEach { s ->
+                    asserter(s)
+                    s.statements.forEach(asserter)
+                }
            }
        }

-        @Test
-        fun `is mangled string id for string sources`()
+        test("isn't absolute for filesystem paths") {
+            val path = assumeReadableFile(fixturesDir, "simple_main.p8")
+            val module = parseModule(SourceCode.File(path))
+            assertSomethingForAllNodes(module) {
+                Path(it.position.file).isAbsolute shouldBe false
+                Path(it.position.file).isRegularFile() shouldBe true
+            }
+        }
+
+        test("is mangled string id for string sources")
        {
            val srcText="""
                %zeropage basicsafe
@@ -395,38 +374,23 @@ class TestProg8Parser {
            """.trimIndent()
            val module = parseModule(SourceCode.Text(srcText))
            assertSomethingForAllNodes(module) {
-                assertTrue(it.position.file.startsWith(SourceCode.stringSourcePrefix))
+                it.position.file shouldStartWith SourceCode.stringSourcePrefix
            }
        }

-        @Test
-        fun `is library prefixed path for resources`()
+        test("is library prefixed path for resources")
        {
            val resource = SourceCode.Resource("prog8lib/math.p8")
            val module = parseModule(resource)
            assertSomethingForAllNodes(module) {
-                assertTrue(it.position.file.startsWith(SourceCode.libraryFilePrefix))
+                it.position.file shouldStartWith SourceCode.libraryFilePrefix
            }
        }
+    }

-        private fun assertSomethingForAllNodes(module: Module, asserter: (Node) -> Unit) {
-            asserter(module)
-            module.statements.forEach(asserter)
-            module.statements.filterIsInstance<Block>().forEach { b ->
-                asserter(b)
-                b.statements.forEach(asserter)
-                b.statements.filterIsInstance<Subroutine>().forEach { s ->
-                    asserter(s)
-                    s.statements.forEach(asserter)
-                }
-            }
-        }    }
+    context("CharLiterals") {

-    @Nested
-    inner class CharLiterals {
-
-        @Test
-        fun `in argument position, no altEnc`() {
+        test("in argument position, no altEnc") {
            val src = SourceCode.Text("""
                 main {
                    sub start() {
@@ -441,13 +405,12 @@ class TestProg8Parser {
                .statements.filterIsInstance<Subroutine>()[0]
            val funCall = startSub.statements.filterIsInstance<IFunctionCall>().first()

-            assertIs<CharLiteral>(funCall.args[0])
+            funCall.args[0] shouldBe(instanceOf<CharLiteral>())
            val char = funCall.args[0] as CharLiteral
-            assertEquals('\n', char.value)
+            char.value shouldBe '\n'
        }

-        @Test
-        fun `on rhs of block-level var decl, no AltEnc`() {
+        test("on rhs of block-level var decl, no AltEnc") {
            val src = SourceCode.Text("""
                main {
                    ubyte c = 'x'
@@ -459,12 +422,11 @@ class TestProg8Parser {
                .statements.filterIsInstance<VarDecl>()[0]

            val rhs = decl.value as CharLiteral
-            assertEquals('x', rhs.value, "char literal's .value")
-            assertEquals(false, rhs.altEncoding, "char literal's .altEncoding")
+            rhs.value shouldBe 'x'
+            rhs.altEncoding shouldBe false
        }

-        @Test
-        fun `on rhs of block-level const decl, with AltEnc`() {
+        test("on rhs of block-level const decl, with AltEnc") {
            val src = SourceCode.Text("""
                main {
                    const ubyte c = @'x'
@@ -476,12 +438,11 @@ class TestProg8Parser {
                .statements.filterIsInstance<VarDecl>()[0]

            val rhs = decl.value as CharLiteral
-            assertEquals('x', rhs.value, "char literal's .value")
-            assertEquals(true, rhs.altEncoding, "char literal's .altEncoding")
+            rhs.value shouldBe 'x'
+            rhs.altEncoding shouldBe true
        }

-        @Test
-        fun `on rhs of subroutine-level var decl, no AltEnc`() {
+        test("on rhs of subroutine-level var decl, no AltEnc") {
            val src = SourceCode.Text("""
                main {
                    sub start() {
@@ -496,12 +457,11 @@ class TestProg8Parser {
                .statements.filterIsInstance<VarDecl>()[0]

            val rhs = decl.value as CharLiteral
-            assertEquals('x', rhs.value, "char literal's .value")
-            assertEquals(false, rhs.altEncoding, "char literal's .altEncoding")
+            rhs.value shouldBe 'x'
+            rhs.altEncoding shouldBe false
        }

-        @Test
-        fun `on rhs of subroutine-level const decl, with AltEnc`() {
+        test("on rhs of subroutine-level const decl, with AltEnc") {
            val src = SourceCode.Text("""
                main {
                    sub start() {
@@ -516,16 +476,14 @@ class TestProg8Parser {
                .statements.filterIsInstance<VarDecl>()[0]

            val rhs = decl.value as CharLiteral
-            assertEquals('x', rhs.value, "char literal's .value")
-            assertEquals(true, rhs.altEncoding, "char literal's .altEncoding")
+            rhs.value shouldBe 'x'
+            rhs.altEncoding shouldBe true
        }
    }

-    @Nested
-    inner class Ranges {
+    context("Ranges") {

-        @Test
-        fun `in for-loops`() {
+        test("in for-loops") {
            val module = parseModule(SourceCode.Text("""
                main {
                    sub start() {
@@ -549,67 +507,64 @@ class TestProg8Parser {
                .statements.filterIsInstance<ForLoop>()
                .map { it.iterable }

-            assertEquals(5, iterables.size)
+            iterables.size shouldBe 5

            val it0 = iterables[0] as RangeExpr
-            assertIs<StringLiteralValue>(it0.from, "parser should leave it as is")
-            assertIs<StringLiteralValue>(it0.to, "parser should leave it as is")
+            it0.from shouldBe instanceOf<StringLiteralValue>()
+            it0.to shouldBe instanceOf<StringLiteralValue>()

            val it1 = iterables[1] as StringLiteralValue
-            assertEquals("something", it1.value, "parser should leave it as is")
+            it1.value shouldBe "something"

            val it2 = iterables[2] as RangeExpr
-            assertIs<CharLiteral>(it2.from, "parser should leave it as is")
-            assertIs<CharLiteral>(it2.to, "parser should leave it as is")
+            it2.from shouldBe instanceOf<CharLiteral>()
+            it2.to shouldBe instanceOf<CharLiteral>()

            val it3 = iterables[3] as RangeExpr
-            assertIs<NumericLiteralValue>(it3.from, "parser should leave it as is")
-            assertIs<NumericLiteralValue>(it3.to, "parser should leave it as is")
+            it3.from shouldBe instanceOf<NumericLiteralValue>()
+            it3.to shouldBe instanceOf<NumericLiteralValue>()

            val it4 = iterables[4] as RangeExpr
-            assertIs<NumericLiteralValue>(it4.from, "parser should leave it as is")
-            assertIs<NumericLiteralValue>(it4.to, "parser should leave it as is")
+            it4.from shouldBe instanceOf<NumericLiteralValue>()
+            it4.to shouldBe instanceOf<NumericLiteralValue>()
        }
    }

-    @Test
-    fun testCharLiteralConstValue() {
+    test("testCharLiteralConstValue") {
        val char1 = CharLiteral('A', false, Position.DUMMY)
        val char2 = CharLiteral('z', true, Position.DUMMY)

        val program = Program("test", DummyFunctions, DummyMemsizer, AsciiStringEncoder)
-        assertEquals(65, char1.constValue(program).number.toInt())
-        assertEquals(122, char2.constValue(program).number.toInt())
+        char1.constValue(program).number.toInt() shouldBe 65
+        char2.constValue(program).number.toInt() shouldBe 122
    }

-    @Test
-    fun testLiteralValueComparisons() {
+    test("testLiteralValueComparisons") {
        val ten = NumericLiteralValue(DataType.UWORD, 10, Position.DUMMY)
        val nine = NumericLiteralValue(DataType.UBYTE, 9, Position.DUMMY)
-        assertEquals(ten, ten)
-        assertNotEquals(ten, nine)
-        assertFalse(ten != ten)
-        assertTrue(ten != nine)
+        ten shouldBe ten
+        nine shouldNotBe ten
+        (ten != ten) shouldBe false
+        (ten != nine) shouldBe true

-        assertTrue(ten > nine)
-        assertTrue(ten >= nine)
-        assertTrue(ten >= ten)
-        assertFalse(ten > ten)
+        (ten > nine) shouldBe true
+        (ten >= nine) shouldBe true
+        (ten >= ten) shouldBe true
+        (ten > ten) shouldBe false

-        assertFalse(ten < nine)
-        assertFalse(ten <= nine)
-        assertTrue(ten <= ten)
-        assertFalse(ten < ten)
+        (ten < nine) shouldBe false
+        (ten <= nine) shouldBe false
+        (ten <= ten) shouldBe true
+        (ten < ten) shouldBe false

        val abc = StringLiteralValue("abc", false, Position.DUMMY)
        val abd = StringLiteralValue("abd", false, Position.DUMMY)
-        assertEquals(abc, abc)
-        assertTrue(abc!=abd)
-        assertFalse(abc!=abc)
+        abc shouldBe abc
+        (abc!=abd) shouldBe true
+        (abc!=abc) shouldBe false
    }

-    @Test
-    fun testAnonScopeStillContainsVarsDirectlyAfterParse() {
+    test("testAnonScopeStillContainsVarsDirectlyAfterParse") {
        val src = SourceCode.Text("""
            main {
                sub start() {
@@ -624,17 +579,22 @@ class TestProg8Parser {
        val mainBlock = module.statements.single() as Block
        val start = mainBlock.statements.single() as Subroutine
        val repeatbody = (start.statements.single() as RepeatLoop).body
-        assertFalse(mainBlock.statements.any { it is VarDecl }, "no vars moved to main block")
-        assertFalse(start.statements.any { it is VarDecl }, "no vars moved to start sub")
-        assertTrue(repeatbody.statements[0] is VarDecl, "var is still in repeat block (anonymousscope)")
+        withClue("no vars moved to main block") {
+            mainBlock.statements.any { it is VarDecl } shouldBe false
+        }
+        withClue("no vars moved to start sub") {
+            start.statements.any { it is VarDecl } shouldBe false
+        }
+        withClue("\"var is still in repeat block (anonymousscope") {
+            repeatbody.statements[0] shouldBe instanceOf<VarDecl>()
+        }
        val initvalue = (repeatbody.statements[0] as VarDecl).value as? NumericLiteralValue
-        assertEquals(99, initvalue?.number?.toInt())
-        assertTrue(repeatbody.statements[1] is PostIncrDecr)
+        initvalue?.number?.toInt() shouldBe 99
+        repeatbody.statements[1] shouldBe instanceOf<PostIncrDecr>()
        // the ast processing steps used in the compiler, will eventually move the var up to the containing scope (subroutine).
    }

-    @Test
-    fun testLabelsWithAnonScopesParsesFine() {
+    test("testLabelsWithAnonScopesParsesFine") {
        val src = SourceCode.Text("""
            main {
                sub start() {
@@ -661,6 +621,105 @@ class TestProg8Parser {
        val mainBlock = module.statements.single() as Block
        val start = mainBlock.statements.single() as Subroutine
        val labels = start.statements.filterIsInstance<Label>()
-        assertEquals(1, labels.size, "only one label in subroutine scope")
+        labels.size shouldBe 1
    }
-}
+
+    test("logical operator 'not' priority") {
+        val src = SourceCode.Text("""
+            main {
+                sub start() {
+                    ubyte xx
+                    xx = not 4 and not 5
+                    xx = not 4 or not 5
+                    xx = not 4 xor not 5
+                }
+            }
+        """)
+        val module = parseModule(src)
+        val start = (module.statements.single() as Block).statements.single() as Subroutine
+        val andAssignmentExpr = (start.statements[1] as Assignment).value
+        val orAssignmentExpr = (start.statements[2] as Assignment).value
+        val xorAssignmentExpr = (start.statements[3] as Assignment).value
+
+        fun correctPrios(expr: Expression, operator: String) {
+            withClue("not should have higher prio as the other logical operators") {
+                expr shouldBe instanceOf<BinaryExpression>()
+                val binExpr = expr as BinaryExpression
+                binExpr.operator shouldBe operator
+                (binExpr.left as PrefixExpression).operator shouldBe "not"
+                (binExpr.right as PrefixExpression).operator shouldBe "not"
+            }
+        }
+
+        correctPrios(andAssignmentExpr, "and")
+        correctPrios(orAssignmentExpr, "or")
+        correctPrios(xorAssignmentExpr, "xor")
+    }
+
+    test("inferred type correct for binaryexpression") {
+        val src = SourceCode.Text("""
+            main {
+                ubyte bb
+                uword ww
+                ubyte bb2 = not bb or not ww       ; expression combining ubyte and uword
+            }
+        """)
+        val module = parseModule(src)
+        val program = Program("test", DummyFunctions, DummyMemsizer, DummyStringEncoder)
+        module.linkIntoProgram(program)
+        val bb2 = (module.statements.single() as Block).statements[2] as VarDecl
+        val expr = bb2.value as BinaryExpression
+        println(expr)
+        expr.operator shouldBe "or"
+        expr.left.inferType(program).getOrElse { fail("dt") } shouldBe DataType.UBYTE
+        expr.right.inferType(program).getOrElse { fail("dt") } shouldBe DataType.UWORD
+        expr.inferType(program).getOrElse { fail("dt") } shouldBe DataType.UBYTE
+    }
+
+    test("inferred type for typecasted expressions with logical operators") {
+        val src=SourceCode.Text("""
+            main {
+                ubyte bb
+                uword ww
+                uword qq = (not bb as uword)
+                uword zz = not bb or not ww
+                ubyte bb2 = not bb or not ww
+                uword zz2 = (not bb as uword) or not ww
+            }
+        """)
+        val module = parseModule(src)
+        val program = Program("test", DummyFunctions, DummyMemsizer, DummyStringEncoder)
+        module.linkIntoProgram(program)
+        val stmts = (module.statements.single() as Block).statements
+        stmts.size shouldBe 6
+        val qq = (stmts[2] as VarDecl).value as TypecastExpression
+        val zz = (stmts[3] as VarDecl).value as BinaryExpression
+        val bb2 = (stmts[4] as VarDecl).value as BinaryExpression
+        val zz2 = (stmts[5] as VarDecl).value as BinaryExpression
+        qq.inferType(program).getOrElse { fail("dt") } shouldBe DataType.UWORD
+        zz.inferType(program).getOrElse { fail("dt") } shouldBe DataType.UBYTE
+        bb2.inferType(program).getOrElse { fail("dt") } shouldBe DataType.UBYTE
+
+        zz2.operator shouldBe "or"
+        val left = zz2.left as TypecastExpression
+        val right = zz2.right as PrefixExpression
+        left.inferType(program).getOrElse { fail("dt") } shouldBe DataType.UWORD
+        right.inferType(program).getOrElse { fail("dt") } shouldBe DataType.UWORD
+        zz2.inferType(program).getOrElse { fail("dt") } shouldBe DataType.UBYTE     //  'or' causes UBYTE result
+    }
+
+    test("type cast from byte to ubyte as desired target type") {
+        val src = SourceCode.Text("""
+            main {
+                ubyte r
+                ubyte ub = (cos8(r)/2 + 100) as ubyte
+            }""")
+        val module = parseModule(src)
+        val program = Program("test", DummyFunctions, DummyMemsizer, DummyStringEncoder)
+        module.linkIntoProgram(program)
+        val stmts = (module.statements.single() as Block).statements
+        stmts.size shouldBe 2
+        val ubexpr = (stmts[1] as VarDecl).value as TypecastExpression
+        ubexpr.inferType(program).getOrElse { fail("dt") } shouldBe DataType.UBYTE
+    }
+})
@@ -0,0 +1,109 @@
+package prog8tests.ast
+
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.collections.shouldBeIn
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.string.shouldContain
+import io.kotest.matchers.types.shouldBeSameInstanceAs
+import prog8.ast.Module
+import prog8.ast.Program
+import prog8.ast.base.Position
+import prog8.ast.internedStringsModuleName
+import prog8.parser.SourceCode
+import prog8tests.ast.helpers.DummyFunctions
+import prog8tests.ast.helpers.DummyMemsizer
+import prog8tests.ast.helpers.DummyStringEncoder
+
+class TestProgram: FunSpec({
+
+    context("Constructor") {
+        test("withNameBuiltinsAndMemsizer") {
+            val program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
+            program.modules.size shouldBe 1
+            program.modules[0].name shouldBe internedStringsModuleName
+            program.modules[0].program shouldBeSameInstanceAs program
+            program.modules[0].parent shouldBeSameInstanceAs program.namespace
+        }
+    }
+
+    context("AddModule") {
+        test("withEmptyModule") {
+            val program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
+            val m1 = Module(mutableListOf(), Position.DUMMY, SourceCode.Generated("bar"))
+
+            val retVal = program.addModule(m1)
+
+            retVal shouldBeSameInstanceAs program
+            program.modules.size shouldBe 2
+            m1 shouldBeIn program.modules
+            m1.program shouldBeSameInstanceAs program
+            m1.parent shouldBeSameInstanceAs program.namespace
+
+            withClue("module may not occur multiple times") {
+                val ex = shouldThrow<IllegalArgumentException> { program.addModule(m1) }
+                ex.message shouldContain m1.name
+            }
+
+            val m2 = Module(mutableListOf(), m1.position, m1.source)
+            withClue("other module but with same name may not occur multiple times") {
+                val ex = shouldThrow<IllegalArgumentException> { program.addModule(m2) }
+                ex.message shouldContain m1.name
+            }
+        }
+    }
+
+    context("MoveModuleToFront") {
+        test("withInternedStringsModule") {
+            val program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
+            val m = program.modules[0]
+            m.name shouldBe internedStringsModuleName
+
+            val retVal = program.moveModuleToFront(m)
+            retVal shouldBeSameInstanceAs program
+            program.modules[0] shouldBeSameInstanceAs m
+        }
+
+        test("withForeignModule") {
+            val program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
+            val m = Module(mutableListOf(), Position.DUMMY, SourceCode.Generated("bar"))
+
+            shouldThrow<IllegalArgumentException> { program.moveModuleToFront(m) }
+        }
+
+        test("withFirstOfPreviouslyAddedModules") {
+            val program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
+            val m1 = Module(mutableListOf(), Position.DUMMY, SourceCode.Generated("bar"))
+            val m2 = Module(mutableListOf(), Position.DUMMY, SourceCode.Generated("qmbl"))
+            program.addModule(m1)
+            program.addModule(m2)
+
+            val retVal = program.moveModuleToFront(m1)
+            retVal shouldBeSameInstanceAs program
+            program.modules.indexOf(m1) shouldBe 0
+        }
+
+        test("withSecondOfPreviouslyAddedModules") {
+            val program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
+            val m1 = Module(mutableListOf(), Position.DUMMY, SourceCode.Generated("bar"))
+            val m2 = Module(mutableListOf(), Position.DUMMY, SourceCode.Generated("qmbl"))
+            program.addModule(m1)
+            program.addModule(m2)
+
+            val retVal = program.moveModuleToFront(m2)
+            retVal shouldBeSameInstanceAs program
+            program.modules.indexOf(m2) shouldBe 0
+        }
+    }
+
+    context("Properties") {
+        test("modules") {
+            val program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
+
+            val ms1 = program.modules
+            val ms2 = program.modules
+            ms2 shouldBeSameInstanceAs ms1
+        }
+    }
+})
@@ -1,9 +1,9 @@
 package prog8tests.ast

-import org.hamcrest.MatcherAssert.assertThat
-import org.hamcrest.core.StringStartsWith
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.core.spec.style.AnnotationSpec
+import io.kotest.matchers.shouldBe
+import io.kotest.matchers.string.shouldContain
 import prog8.parser.SourceCode
 import prog8.parser.SourceCode.Companion.libraryFilePrefix
 import prog8tests.ast.helpers.assumeNotExists
@@ -11,11 +11,9 @@ import prog8tests.ast.helpers.assumeReadableFile
 import prog8tests.ast.helpers.fixturesDir
 import prog8tests.ast.helpers.resourcesDir
 import kotlin.io.path.Path
-import kotlin.test.*


-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestSourceCode {
+class TestSourceCode: AnnotationSpec() {

    @Test
    fun testFromString() {
@@ -25,30 +23,30 @@ class TestSourceCode {
        val src = SourceCode.Text(text)
        val actualText = src.getCharStream().toString()

-        assertContains(src.origin, Regex("^<String@[0-9a-f\\-]+>$"))
-        assertEquals(text, actualText)
-        assertFalse(src.isFromResources)
-        assertFalse(src.isFromFilesystem)
-        assertThat(src.toString(), StringStartsWith("prog8.parser.SourceCode"))
+        src.origin shouldContain Regex("^<String@[0-9a-f\\-]+>$")
+        actualText shouldBe text
+        src.isFromResources shouldBe false
+        src.isFromFilesystem shouldBe false
+        src.toString().startsWith("prog8.parser.SourceCode") shouldBe true
    }

    @Test
    fun testFromPathWithNonExistingPath() {
        val filename = "i_do_not_exist.p8"
        val path = assumeNotExists(fixturesDir, filename)
-        assertFailsWith<NoSuchFileException> { SourceCode.File(path) }
+        shouldThrow<NoSuchFileException> { SourceCode.File(path) }
    }

    @Test
    fun testFromPathWithMissingExtension_p8() {
        val pathWithoutExt = assumeNotExists(fixturesDir,"simple_main")
        assumeReadableFile(fixturesDir,"simple_main.p8")
-        assertFailsWith<NoSuchFileException> { SourceCode.File(pathWithoutExt) }
+        shouldThrow<NoSuchFileException> { SourceCode.File(pathWithoutExt) }
    }

    @Test
    fun testFromPathWithDirectory() {
-        assertFailsWith<AccessDeniedException> { SourceCode.File(fixturesDir) }
+        shouldThrow<AccessDeniedException> { SourceCode.File(fixturesDir) }
    }

    @Test
@@ -57,10 +55,10 @@ class TestSourceCode {
        val path = assumeReadableFile(fixturesDir, filename)
        val src = SourceCode.File(path)
        val expectedOrigin = SourceCode.relative(path).toString()
-        assertEquals(expectedOrigin, src.origin)
-        assertEquals(path.toFile().readText(), src.readText())
-        assertFalse(src.isFromResources)
-        assertTrue(src.isFromFilesystem)
+        src.origin shouldBe expectedOrigin
+        src.readText() shouldBe path.toFile().readText()
+        src.isFromResources shouldBe false
+        src.isFromFilesystem shouldBe true
    }

    @Test
@@ -70,8 +68,8 @@ class TestSourceCode {
        val srcFile = assumeReadableFile(path).toFile()
        val src = SourceCode.File(path)
        val expectedOrigin = SourceCode.relative(path).toString()
-        assertEquals(expectedOrigin, src.origin)
-        assertEquals(srcFile.readText(), src.readText())
+        src.origin shouldBe expectedOrigin
+        src.readText() shouldBe srcFile.readText()
    }

    @Test
@@ -80,10 +78,10 @@ class TestSourceCode {
        val srcFile = assumeReadableFile(resourcesDir, pathString).toFile()
        val src = SourceCode.Resource(pathString)

-        assertEquals("$libraryFilePrefix/$pathString", src.origin)
-        assertEquals(srcFile.readText(), src.readText())
-        assertTrue(src.isFromResources)
-        assertFalse(src.isFromFilesystem)
+        src.origin shouldBe "$libraryFilePrefix/$pathString"
+        src.readText() shouldBe srcFile.readText()
+        src.isFromResources shouldBe true
+        src.isFromFilesystem shouldBe false
    }

    @Test
@@ -92,8 +90,8 @@ class TestSourceCode {
        val srcFile = assumeReadableFile(resourcesDir, pathString.substring(1)).toFile()
        val src = SourceCode.Resource(pathString)

-        assertEquals("$libraryFilePrefix$pathString", src.origin)
-        assertEquals(srcFile.readText(), src.readText())
+        src.origin shouldBe "$libraryFilePrefix$pathString"
+        src.readText() shouldBe srcFile.readText()
    }

    @Test
@@ -102,9 +100,9 @@ class TestSourceCode {
        val srcFile = assumeReadableFile(resourcesDir, pathString).toFile()
        val src = SourceCode.Resource(pathString)

-        assertEquals("$libraryFilePrefix/$pathString", src.origin)
-        assertEquals(srcFile.readText(), src.readText())
-        assertTrue(src.isFromResources, ".isFromResources")
+        src.origin shouldBe "$libraryFilePrefix/$pathString"
+        src.readText() shouldBe srcFile.readText()
+        src.isFromResources shouldBe true
    }

    @Test
@@ -113,8 +111,8 @@ class TestSourceCode {
        val srcFile = assumeReadableFile(resourcesDir, pathString.substring(1)).toFile()
        val src = SourceCode.Resource(pathString)

-        assertEquals("$libraryFilePrefix$pathString", src.origin)
-        assertEquals(srcFile.readText(), src.readText())
+        src.origin shouldBe "$libraryFilePrefix$pathString"
+        src.readText() shouldBe srcFile.readText()
    }

    @Test
@@ -123,9 +121,9 @@ class TestSourceCode {
        val srcFile = assumeReadableFile(resourcesDir, pathString.substring(1)).toFile()
        val src = SourceCode.Resource(pathString)

-        assertEquals("$libraryFilePrefix/prog8lib/math.p8", src.origin)
-        assertEquals(srcFile.readText(), src.readText())
-        assertTrue(src.isFromResources, ".isFromResources")
+        src.origin shouldBe "$libraryFilePrefix/prog8lib/math.p8"
+        src.readText() shouldBe srcFile.readText()
+        src.isFromResources shouldBe true
    }


@@ -134,13 +132,13 @@ class TestSourceCode {
        val pathString = "/prog8lib/i_do_not_exist"
        assumeNotExists(resourcesDir, pathString.substring(1))

-        assertFailsWith<NoSuchFileException> { SourceCode.Resource(pathString) }
+        shouldThrow<NoSuchFileException> { SourceCode.Resource(pathString) }
    }
    @Test
    fun testFromResourcesWithNonExistingFile_withoutLeadingSlash() {
        val pathString = "prog8lib/i_do_not_exist"
        assumeNotExists(resourcesDir, pathString)

-        assertFailsWith<NoSuchFileException> { SourceCode.Resource(pathString) }
+        shouldThrow<NoSuchFileException> { SourceCode.Resource(pathString) }
    }
 }
@@ -1,19 +1,15 @@
 package prog8tests.ast

-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.core.spec.style.AnnotationSpec
+import io.kotest.matchers.shouldBe
 import prog8.ast.base.DataType
 import prog8.ast.statements.Block
 import prog8.ast.statements.Subroutine
 import prog8.parser.Prog8Parser.parseModule
 import prog8.parser.SourceCode
-import kotlin.test.assertEquals
-import kotlin.test.assertFalse
-import kotlin.test.assertTrue


-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestSubroutines {
+class TestSubroutines: AnnotationSpec() {

    @Test
    fun stringParameterAcceptedInParser() {
@@ -33,12 +29,12 @@ class TestSubroutines {
        val mainBlock = module.statements.single() as Block
        val asmfunc = mainBlock.statements.filterIsInstance<Subroutine>().single { it.name=="asmfunc"}
        val func = mainBlock.statements.filterIsInstance<Subroutine>().single { it.name=="func"}
-        assertTrue(asmfunc.isAsmSubroutine)
-        assertEquals(DataType.STR, asmfunc.parameters.single().type)
-        assertTrue(asmfunc.statements.isEmpty())
-        assertFalse(func.isAsmSubroutine)
-        assertEquals(DataType.STR, func.parameters.single().type)
-        assertTrue(func.statements.isEmpty())
+        asmfunc.isAsmSubroutine shouldBe true
+        asmfunc.parameters.single().type shouldBe DataType.STR
+        asmfunc.statements.isEmpty() shouldBe true
+        func.isAsmSubroutine shouldBe false
+        func.parameters.single().type shouldBe DataType.STR
+        func.statements.isEmpty() shouldBe true
    }

    @Test
@@ -59,11 +55,11 @@ class TestSubroutines {
        val mainBlock = module.statements.single() as Block
        val asmfunc = mainBlock.statements.filterIsInstance<Subroutine>().single { it.name=="asmfunc"}
        val func = mainBlock.statements.filterIsInstance<Subroutine>().single { it.name=="func"}
-        assertTrue(asmfunc.isAsmSubroutine)
-        assertEquals(DataType.ARRAY_UB, asmfunc.parameters.single().type)
-        assertTrue(asmfunc.statements.isEmpty())
-        assertFalse(func.isAsmSubroutine)
-        assertEquals(DataType.ARRAY_UB, func.parameters.single().type)
-        assertTrue(func.statements.isEmpty())
+        asmfunc.isAsmSubroutine shouldBe true
+        asmfunc.parameters.single().type shouldBe DataType.ARRAY_UB
+        asmfunc.statements.isEmpty() shouldBe true
+        func.isAsmSubroutine shouldBe false
+        func.parameters.single().type shouldBe DataType.ARRAY_UB
+        func.statements.isEmpty() shouldBe true
    }
 }
@@ -1,118 +0,0 @@
-package prog8tests.ast.ast
-
-import org.hamcrest.MatcherAssert.assertThat
-import org.hamcrest.Matchers.containsString
-import org.hamcrest.Matchers.equalTo
-import org.junit.jupiter.api.Nested
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
-import prog8.ast.Module
-import prog8.ast.Program
-import prog8.ast.base.Position
-import prog8.ast.internedStringsModuleName
-import prog8.parser.SourceCode
-import prog8tests.ast.helpers.DummyFunctions
-import prog8tests.ast.helpers.DummyMemsizer
-import prog8tests.ast.helpers.DummyStringEncoder
-import kotlin.test.assertContains
-import kotlin.test.assertFailsWith
-import kotlin.test.assertSame
-
-
-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class ProgramTests {
-
-    @Nested
-    inner class Constructor {
-        @Test
-        fun withNameBuiltinsAndMemsizer() {
-            val program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
-            assertThat(program.modules.size, equalTo(1))
-            assertThat(program.modules[0].name, equalTo(internedStringsModuleName))
-            assertSame(program, program.modules[0].program)
-            assertSame(program.namespace, program.modules[0].parent)
-        }
-
-    }
-
-    @Nested
-    inner class AddModule {
-        @Test
-        fun withEmptyModule() {
-            val program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
-            val m1 = Module(mutableListOf(), Position.DUMMY, SourceCode.Generated("bar"))
-
-            val retVal = program.addModule(m1)
-
-            assertSame(program, retVal)
-            assertThat(program.modules.size, equalTo(2))
-            assertContains(program.modules, m1)
-            assertSame(program, m1.program)
-            assertSame(program.namespace, m1.parent)
-
-            assertThat("module may not occur multiple times",
-                assertFailsWith<IllegalArgumentException> { program.addModule(m1) }.message, containsString(m1.name))
-
-            val m2 = Module(mutableListOf(), m1.position, m1.source)
-            assertThat("other module but with same name may not occur multiple times",
-                assertFailsWith<IllegalArgumentException> { program.addModule(m2) }.message, containsString(m2.name))
-        }
-    }
-
-    @Nested
-    inner class MoveModuleToFront {
-        @Test
-        fun withInternedStringsModule() {
-            val program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
-            val m = program.modules[0]
-            assertThat(m.name, equalTo(internedStringsModuleName))
-
-            val retVal = program.moveModuleToFront(m)
-            assertSame(program, retVal)
-            assertSame(m, program.modules[0])
-        }
-        @Test
-        fun withForeignModule() {
-            val program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
-            val m = Module(mutableListOf(), Position.DUMMY, SourceCode.Generated("bar"))
-
-            assertFailsWith<IllegalArgumentException> { program.moveModuleToFront(m) }
-        }
-        @Test
-        fun withFirstOfPreviouslyAddedModules() {
-            val program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
-            val m1 = Module(mutableListOf(), Position.DUMMY, SourceCode.Generated("bar"))
-            val m2 = Module(mutableListOf(), Position.DUMMY, SourceCode.Generated("qmbl"))
-            program.addModule(m1)
-            program.addModule(m2)
-
-            val retVal = program.moveModuleToFront(m1)
-            assertSame(program, retVal)
-            assertThat(program.modules.indexOf(m1), equalTo(0))
-        }
-        @Test
-        fun withSecondOfPreviouslyAddedModules() {
-            val program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
-            val m1 = Module(mutableListOf(), Position.DUMMY, SourceCode.Generated("bar"))
-            val m2 = Module(mutableListOf(), Position.DUMMY, SourceCode.Generated("qmbl"))
-            program.addModule(m1)
-            program.addModule(m2)
-
-            val retVal = program.moveModuleToFront(m2)
-            assertSame(program, retVal)
-            assertThat(program.modules.indexOf(m2), equalTo(0))
-        }
-    }
-
-    @Nested
-    inner class Properties {
-        @Test
-        fun modules() {
-            val program = Program("foo", DummyFunctions, DummyMemsizer, DummyStringEncoder)
-
-            val ms1 = program.modules
-            val ms2 = program.modules
-            assertSame(ms1, ms2)
-        }
-    }
-}
@@ -1,5 +1,30 @@
 package prog8tests.ast.helpers

+fun <T, U> cartesianProduct(c1: Collection<T>, c2: Collection<U>): Sequence<Pair<T, U>> {
+    return c1.flatMap { lhsElem -> c2.map { rhsElem -> lhsElem to rhsElem } }.asSequence()
+}
+
+fun <T, U, V> cartesianProduct(c1: Collection<T>, c2: Collection<U>, c3: Collection<V>): Sequence<Triple<T, U, V>> {
+    return sequence {
+        for (a in c1)
+            for (b in c2)
+                for (c in c3)
+                    yield(Triple(a,b,c))
+    }
+}
+
+data class Product<out T, out U, out V, out W>(val first: T, val second: U, val third: V, val fourth: W)
+
+fun <T, U, V, W> cartesianProduct(c1: Collection<T>, c2: Collection<U>, c3: Collection<V>, c4: Collection<W>): Sequence<Product<T, U, V, W>> {
+    return sequence {
+        for (a in c1)
+            for (b in c2)
+                for (c in c3)
+                    for (d in c4)
+                        yield(Product(a,b,c,d))
+    }
+}
+
 fun <A, B, R> mapCombinations(dim1: Iterable<A>, dim2: Iterable<B>, combine2: (A, B) -> R) =
    sequence {
        for (a in dim1)
@@ -1,49 +1,65 @@
 package prog8tests.ast.helpers

+import io.kotest.assertions.withClue
+import io.kotest.matchers.shouldBe
+import java.nio.file.Files
 import java.nio.file.Path
 import kotlin.io.path.*
-import kotlin.test.assertFalse
-import kotlin.test.assertTrue


 val workingDir = assumeDirectory("").absolute()   // Note: "." does NOT work..!
 val fixturesDir = assumeDirectory(workingDir,"test/fixtures")
 val resourcesDir = assumeDirectory(workingDir,"res")
-val outputDir = assumeDirectory(workingDir, "build/tmp/test")
+val outputDir: Path = createIfNotExists(workingDir, "build/tmp/test").also{ assumeDirectory(workingDir, "build/tmp/test") }
+
+fun createIfNotExists(workingDir: Path, path: String): Path {
+    val dir = workingDir / path
+    if(!dir.toFile().isDirectory)
+        Files.createDirectories(dir)
+    return dir
+}

 fun assumeNotExists(path: Path): Path {
-    assertFalse(path.exists(), "sanity check: should not exist: ${path.absolute()}")
+    withClue("sanity check: should not exist: ${path.absolute()}") {
+        path.exists() shouldBe false
+    }
    return path
 }

 fun assumeNotExists(pathStr: String): Path = assumeNotExists(Path(pathStr))
-fun assumeNotExists(path: Path, other: String): Path = assumeNotExists(path.div(other))
+fun assumeNotExists(path: Path, other: String): Path = assumeNotExists(path / other)

 fun assumeReadable(path: Path): Path {
-    assertTrue(path.isReadable(), "sanity check: should be readable: ${path.absolute()}")
+    withClue("sanity check: should be readable: ${path.absolute()}") {
+        path.isReadable() shouldBe true
+    }
    return path
 }

 fun assumeReadableFile(path: Path): Path {
-    assertTrue(path.isRegularFile(), "sanity check: should be normal file: ${path.absolute()}")
+    withClue("sanity check: should be normal file: ${path.absolute()}") {
+        path.isRegularFile() shouldBe true
+    }
    return assumeReadable(path)
 }

 fun assumeReadableFile(pathStr: String): Path = assumeReadableFile(Path(pathStr))
 fun assumeReadableFile(pathStr: String, other: Path): Path = assumeReadableFile(Path(pathStr), other)
 fun assumeReadableFile(pathStr: String, other: String): Path = assumeReadableFile(Path(pathStr), other)
-fun assumeReadableFile(path: Path, other: String): Path = assumeReadableFile(path.div(other))
-fun assumeReadableFile(path: Path, other: Path): Path = assumeReadableFile(path.div(other))
+fun assumeReadableFile(path: Path, other: String): Path = assumeReadableFile(path / other)
+fun assumeReadableFile(path: Path, other: Path): Path = assumeReadableFile(path / other)

 fun assumeDirectory(path: Path): Path {
-    assertTrue(path.isDirectory(), "sanity check; should be directory: $path")
+    withClue("sanity check; should be directory: $path") {
+        path.isDirectory() shouldBe true
+    }
    return path
 }

 fun assumeDirectory(pathStr: String): Path = assumeDirectory(Path(pathStr))
-fun assumeDirectory(path: Path, other: String): Path = assumeDirectory(path.div(other))
-fun assumeDirectory(pathStr: String, other: String): Path = assumeDirectory(Path(pathStr).div(other))
-fun assumeDirectory(pathStr: String, other: Path): Path = assumeDirectory(Path(pathStr).div(other))
+fun assumeDirectory(path: Path, other: String): Path = assumeDirectory(path / other)
+fun assumeDirectory(pathStr: String, other: String): Path = assumeDirectory(Path(pathStr) / other)
+fun assumeDirectory(pathStr: String, other: Path): Path = assumeDirectory(Path(pathStr) / other)


@Deprecated("Directories are checked automatically at init.",
@@ -1,362 +1,309 @@
 package prog8tests.ast

-import org.hamcrest.MatcherAssert.assertThat
-import org.hamcrest.Matchers.`is`
-import org.junit.jupiter.api.Nested
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
+import io.kotest.assertions.throwables.shouldThrow
+import io.kotest.assertions.withClue
+import io.kotest.core.spec.style.FunSpec
+import io.kotest.matchers.shouldBe
 import prog8tests.ast.helpers.*
 import kotlin.io.path.Path
 import kotlin.io.path.div
-import kotlin.test.assertFailsWith


 // Do not move into folder helpers/!
 // This folder is also used by compiler/test
 // but the testing of the helpers themselves must be performed ONLY HERE.
 //
-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class PathsHelpersTests {
+class PathsHelpersTests: FunSpec({

-    @Nested
-    inner class AssumeNotExists {
+    context("AssumeNotExists") {

-        @Nested
-        inner class WithOnePathArg {
+        context("WithOnePathArg") {

-            @Test
-            fun `on non-existing path`() {
-                val path = fixturesDir.div("i_do_not_exist")
-                assertThat("should return the path",
-                    assumeNotExists(path), `is`(path))
-            }
-
-            @Test
-            fun `on existing file`() {
-                assertFailsWith<java.lang.AssertionError> {
-                    assumeNotExists(fixturesDir.div("simple_main.p8"))
+            test("on non-existing path") {
+                val path = fixturesDir / "i_do_not_exist"
+                withClue("should return the path") {
+                    assumeNotExists(path) shouldBe path
                }
            }

-            @Test
-            fun `on existing directory`() {
-                assertFailsWith<java.lang.AssertionError> {
+            test("on existing file") {
+                shouldThrow<java.lang.AssertionError> {
+                    assumeNotExists(fixturesDir / "simple_main.p8")
+                }
+            }
+
+            test("on existing directory") {
+                shouldThrow<java.lang.AssertionError> {
                    assumeNotExists(fixturesDir)
                }
            }
        }

-        @Nested
-        inner class WithOneStringArg {
+        context("WithOneStringArg") {

-            @Test
-            fun `on non-existing path`() {
-                val path = fixturesDir.div("i_do_not_exist")
-                assertThat("should return the path",
-                    assumeNotExists("$path"), `is`(path))
+            test("on non-existing path") {
+                val path = fixturesDir / "i_do_not_exist"
+                withClue("should return the path") {
+                    assumeNotExists("$path") shouldBe path
+                }
            }

-            @Test
-            fun `on existing file`() {
-                val path = fixturesDir.div("simple_main.p8")
-                assertFailsWith<java.lang.AssertionError> {
+            test("on existing file") {
+                val path = fixturesDir / "simple_main.p8"
+                shouldThrow<java.lang.AssertionError> {
                    assumeNotExists("$path")
                }
            }

-            @Test
-            fun `on existing directory`() {
-                assertFailsWith<java.lang.AssertionError> {
+            test("on existing directory") {
+                shouldThrow<java.lang.AssertionError> {
                    assumeNotExists("$fixturesDir")
                }
            }
        }

-        @Nested
-        inner class WithPathAndStringArgs {
+        context("WithPathAndStringArgs") {

-            @Test
-            fun `on non-existing path`() {
-                val path = fixturesDir.div("i_do_not_exist")
-                assertThat("should return the path",
-                    assumeNotExists(fixturesDir, "i_do_not_exist"), `is`(path))
+            test("on non-existing path") {
+                val path = fixturesDir / "i_do_not_exist"
+                withClue("should return the path") {
+                    assumeNotExists(fixturesDir / "i_do_not_exist") shouldBe path
+                }
            }

-            @Test
-            fun `on existing file`() {
-                assertFailsWith<java.lang.AssertionError> {
+            test("on existing file") {
+                shouldThrow<java.lang.AssertionError> {
                    assumeNotExists(fixturesDir, "simple_main.p8")
                }
            }

-            @Test
-            fun `on existing directory`() {
-                assertFailsWith<java.lang.AssertionError> {
+            test("on existing directory") {
+                shouldThrow<java.lang.AssertionError> {
                    assumeNotExists(fixturesDir, "..")
                }
            }
        }
    }

-    @Nested
-    inner class AssumeDirectory {
+    context("AssumeDirectory") {

-        @Nested
-        inner class WithOnePathArg {
-            @Test
-            fun `on non-existing path`() {
-                val path = fixturesDir.div("i_do_not_exist")
-                assertFailsWith<AssertionError> {
+        context("WithOnePathArg") {
+            test("on non-existing path") {
+                val path = fixturesDir / "i_do_not_exist"
+                shouldThrow<AssertionError> {
                    assumeDirectory(path)
                }
            }

-            @Test
-            fun `on existing file`() {
-                val path = fixturesDir.div("simple_main.p8")
-                assertFailsWith<AssertionError> {
+            test("on existing file") {
+                val path = fixturesDir / "simple_main.p8"
+                shouldThrow<AssertionError> {
                    assumeDirectory(path)
                }
            }

-            @Test
-            fun `on existing directory`() {
+            test("on existing directory") {
                val path = workingDir
-                assertThat("should return the path", assumeDirectory(path), `is`(path))
+                withClue("should return the path") {
+                    assumeDirectory(path) shouldBe path
+                }
            }
        }

-        @Nested
-        inner class WithOneStringArg {
-            @Test
-            fun `on non-existing path`() {
-                val path = fixturesDir.div("i_do_not_exist")
-                assertFailsWith<AssertionError> {
+        context("WithOneStringArg") {
+            test("on non-existing path") {
+                val path = fixturesDir / "i_do_not_exist"
+                shouldThrow<AssertionError> {
                    assumeDirectory("$path")
                }
            }

-            @Test
-            fun `on existing file`() {
-                val path = fixturesDir.div("simple_main.p8")
-                assertFailsWith<AssertionError> {
+            test("on existing file") {
+                val path = fixturesDir / "simple_main.p8"
+                shouldThrow<AssertionError> {
                    assumeDirectory("$path")
                }
            }

-            @Test
-            fun `on existing directory`() {
+            test("on existing directory") {
                val path = workingDir
-                assertThat("should return the path",
-                    assumeDirectory("$path"), `is`(path))
+                withClue("should return the path") {
+                    assumeDirectory("$path") shouldBe path
+                }
            }
        }

-        @Nested
-        inner class WithPathAndStringArgs {
-            @Test
-            fun `on non-existing path`() {
-                assertFailsWith<AssertionError> {
+        context("WithPathAndStringArgs") {
+            test("on non-existing path") {
+                shouldThrow<AssertionError> {
                    assumeDirectory(fixturesDir, "i_do_not_exist")
                }
            }

-            @Test
-            fun `on existing file`() {
-                assertFailsWith<AssertionError> {
+            test("on existing file") {
+                shouldThrow<AssertionError> {
                    assumeDirectory(fixturesDir, "simple_main.p8")
                }
            }

-            @Test
-            fun `on existing directory`() {
-                val path = workingDir.div("..")
-                assertThat(
-                    "should return resulting path",
-                    assumeDirectory(workingDir, ".."), `is`(path)
-                )
+            test("on existing directory") {
+                val path = workingDir / ".."
+                withClue("should return resulting path") {
+                    assumeDirectory(workingDir / "..") shouldBe path
+                }
            }
        }

-        @Nested
-        inner class WithStringAndStringArgs {
-            @Test
-            fun `on non-existing path`() {
-                assertFailsWith<AssertionError> {
+        context("WithStringAndStringArgs") {
+            test("on non-existing path") {
+                shouldThrow<AssertionError> {
                    assumeDirectory("$fixturesDir", "i_do_not_exist")
                }
            }

-            @Test
-            fun `on existing file`() {
-                assertFailsWith<AssertionError> {
+            test("on existing file") {
+                shouldThrow<AssertionError> {
                    assumeDirectory("$fixturesDir", "simple_main.p8")
                }
            }

-            @Test
-            fun `on existing directory`() {
-                val path = workingDir.div("..")
-                assertThat(
-                    "should return resulting path",
-                    assumeDirectory("$workingDir", ".."), `is`(path)
-                )
+            test("on existing directory") {
+                val path = workingDir / ".."
+                withClue("should return resulting path") {
+                    assumeDirectory(workingDir / "..") shouldBe path
+                }
            }
        }

-        @Nested
-        inner class WithStringAndPathArgs {
-            @Test
-            fun `on non-existing path`() {
-                assertFailsWith<AssertionError> {
+        context("WithStringAndPathArgs") {
+            test("on non-existing path") {
+                shouldThrow<AssertionError> {
                    assumeDirectory("$fixturesDir", Path("i_do_not_exist"))
                }
            }

-            @Test
-            fun `on existing file`() {
-                assertFailsWith<AssertionError> {
+            test("on existing file") {
+                shouldThrow<AssertionError> {
                    assumeDirectory("$fixturesDir", Path("simple_main.p8"))
                }
            }

-            @Test
-            fun `on existing directory`() {
-                val path = workingDir.div("..")
-                assertThat(
-                    "should return resulting path",
-                    assumeDirectory("$workingDir", Path("..")), `is`(path)
-                )
+            test("on existing directory") {
+                val path = workingDir / ".."
+                withClue("should return resulting path") {
+                    assumeDirectory(workingDir / Path("..")) shouldBe path
+                }
            }
        }
    }

-    @Nested
-    inner class AssumeReadableFile {
+    context("AssumeReadableFile") {

-        @Nested
-        inner class WithOnePathArg {
+        context("WithOnePathArg") {

-            @Test
-            fun `on non-existing path`() {
-                val path = fixturesDir.div("i_do_not_exist")
-                assertFailsWith<AssertionError> {
+            test("on non-existing path") {
+                val path = fixturesDir / "i_do_not_exist"
+                shouldThrow<AssertionError> {
                    assumeReadableFile(path)
                }
            }

-            @Test
-            fun `on readable file`() {
-                val path = fixturesDir.div("simple_main.p8")
-                assertThat("should return the path",
-                    assumeReadableFile(path), `is`(path))
+            test("on readable file") {
+                val path = fixturesDir / "simple_main.p8"
+                withClue("should return the path") {
+                    assumeReadableFile(path) shouldBe path
+                }
            }

-            @Test
-            fun `on directory`() {
-                assertFailsWith<AssertionError> {
+            test("on directory") {
+                shouldThrow<AssertionError> {
                    assumeReadableFile(fixturesDir)
                }
            }
        }

-        @Nested
-        inner class WithOneStringArg {
+        context("WithOneStringArg") {

-            @Test
-            fun `on non-existing path`() {
-                val path = fixturesDir.div("i_do_not_exist")
-                assertFailsWith<AssertionError> {
+            test("on non-existing path") {
+                val path = fixturesDir / "i_do_not_exist"
+                shouldThrow<AssertionError> {
                    assumeReadableFile("$path")
                }
            }

-            @Test
-            fun `on readable file`() {
-                val path = fixturesDir.div("simple_main.p8")
-                assertThat("should return the resulting path",
-                    assumeReadableFile("$path"), `is`(path))
+            test("on readable file") {
+                val path = fixturesDir / "simple_main.p8"
+                withClue("should return the resulting path") {
+                    assumeReadableFile("$path") shouldBe path
+                }
            }

-            @Test
-            fun `on directory`() {
-                assertFailsWith<AssertionError> {
+            test("on directory") {
+                shouldThrow<AssertionError> {
                    assumeReadableFile("$fixturesDir")
                }
            }
        }

-        @Nested
-        inner class WithPathAndStringArgs {
-            @Test
-            fun `on non-existing path`() {
-                assertFailsWith<java.lang.AssertionError> {
+        context("WithPathAndStringArgs") {
+            test("on non-existing path") {
+                shouldThrow<java.lang.AssertionError> {
                    assumeReadableFile(fixturesDir, "i_do_not_exist")
                }
            }

-            @Test
-            fun `on readable file`() {
-                val path = fixturesDir.div("simple_main.p8")
-                assertThat("should return the resulting path",
-                    assumeReadableFile(fixturesDir, "simple_main.p8"), `is`(path))
+            test("on readable file") {
+                val path = fixturesDir / "simple_main.p8"
+                withClue("should return the resulting path") {
+                    assumeReadableFile(fixturesDir / "simple_main.p8") shouldBe path
+                }
            }

-            @Test
-            fun `on directory`() {
-                assertFailsWith<AssertionError> {
+            test("on directory") {
+                shouldThrow<AssertionError> {
                    assumeReadableFile(fixturesDir, "..")
                }
            }
        }

-        @Nested
-        inner class WithPathAndPathArgs {
-            @Test
-            fun `on non-existing path`() {
-                assertFailsWith<java.lang.AssertionError> {
+        context("WithPathAndPathArgs") {
+            test("on non-existing path") {
+                shouldThrow<java.lang.AssertionError> {
                    assumeReadableFile(fixturesDir, Path("i_do_not_exist"))
                }
            }

-            @Test fun `on readable file`() {
-                assertThat("should return the resulting path",
-                    assumeReadableFile(fixturesDir, Path("simple_main.p8")),
-                        `is`(fixturesDir.div("simple_main.p8"))
-                )
+            test("on readable file") {
+                withClue("should return the resulting path") {
+                    assumeReadableFile(fixturesDir / Path("simple_main.p8")) shouldBe fixturesDir / "simple_main.p8"
+                }
            }

-            @Test
-            fun `on directory`() {
-                assertFailsWith<AssertionError> {
+            test("on directory") {
+                shouldThrow<AssertionError> {
                    assumeReadableFile(fixturesDir, Path(".."))
                }
            }
        }

-        @Nested
-        inner class WithStringAndStringArgs {
-            @Test
-            fun `on non-existing path`() {
-                assertFailsWith<java.lang.AssertionError> {
+        context("WithStringAndStringArgs") {
+            test("on non-existing path") {
+                shouldThrow<java.lang.AssertionError> {
                    assumeReadableFile("$fixturesDir", "i_do_not_exist")
                }
            }

-            @Test
-            fun `on readable file`() {
-                assertThat("should return the resulting path",
-                    assumeReadableFile(fixturesDir.toString(), "simple_main.p8"),
-                    `is`(fixturesDir.div("simple_main.p8"))
-                )
+            test("on readable file") {
+                withClue("should return the resulting path") {
+                    assumeReadableFile(fixturesDir / "simple_main.p8") shouldBe  fixturesDir / "simple_main.p8"
+                }
            }

-            @Test
-            fun `on directory`() {
-                assertFailsWith<AssertionError> {
+            test("on directory") {
+                shouldThrow<AssertionError> {
                    assumeReadableFile("$fixturesDir", "..")
                }
            }
        }
    }
-}
+})
@@ -15,12 +15,6 @@ dependencies {
    implementation project(':compilerAst')
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
    // implementation "org.jetbrains.kotlin:kotlin-reflect"
-
-    testImplementation "org.jetbrains.kotlin:kotlin-test-junit5"
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.2'
-    testImplementation 'org.hamcrest:hamcrest:2.2'
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.2'
-
 }

 sourceSets {
@@ -32,23 +26,6 @@ sourceSets {
            srcDirs = ["${project.projectDir}/res"]
        }
    }
-    test {
-        java {
-            srcDirs = ["${project.projectDir}/test"]
-        }
-    }
 }

-
-test {
-    // Enable JUnit 5 (Gradle 4.6+).
-    useJUnitPlatform()
-
-    // Always run tests, even when nothing changed.
-    dependsOn 'cleanTest'
-
-    // Show test results.
-    testLogging {
-        events "skipped", "failed"
-    }
-}
+// note: there are no unit tests in this module!
@@ -11,7 +11,5 @@
    <orderEntry type="sourceFolder" forTests="false" />
    <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
    <orderEntry type="module" module-name="compilerAst" />
-    <orderEntry type="library" scope="TEST" name="hamcrest" level="project" />
-    <orderEntry type="library" name="junit.jupiter" level="project" />
  </component>
 </module>
@@ -1,2 +1,2 @@
 Unittests for things in this module are located in the Compiler module instead,
-for convenience sake - and to not spread the test cases around too much.
+for convenience sake, and to not spread the test cases around too much.
@@ -1,5 +1,6 @@
 package prog8.compilerinterface

+import prog8.ast.base.FatalAstException
 import prog8.ast.base.VarDeclType
 import prog8.ast.expressions.IdentifierReference
 import prog8.ast.expressions.NumericLiteralValue
@@ -41,7 +42,7 @@ fun AssignTarget.isInRegularRAMof(machine: IMachineDefinition): Boolean {
        }
        ident != null -> {
            val program = definingModule.program
-            val decl = ident.targetVarDecl(program)!!
+            val decl = ident.targetVarDecl(program) ?: throw FatalAstException("invalid identifier ${ident.nameInSource}")
            return if (decl.type == VarDeclType.MEMORY && decl.value is NumericLiteralValue)
                machine.isRegularRAMaddress((decl.value as NumericLiteralValue).number.toInt())
            else
@@ -109,11 +109,19 @@ private val functionSignatures: List<FSignature> = listOf(
    FSignature("sin8u"       , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.UBYTE, ::builtinSin8u ),
    FSignature("sin16"       , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.WORD, ::builtinSin16 ),
    FSignature("sin16u"      , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.UWORD, ::builtinSin16u ),
+    FSignature("sinr8"       , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.BYTE, ::builtinSinR8 ),
+    FSignature("sinr8u"      , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.UBYTE, ::builtinSinR8u ),
+    FSignature("sinr16"      , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.WORD, ::builtinSinR16 ),
+    FSignature("sinr16u"     , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.UWORD, ::builtinSinR16u ),
    FSignature("cos"         , true, listOf(FParam("rads", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg -> oneDoubleArg(a, p, prg, Math::cos) },
    FSignature("cos8"        , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.BYTE, ::builtinCos8 ),
    FSignature("cos8u"       , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.UBYTE, ::builtinCos8u ),
    FSignature("cos16"       , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.WORD, ::builtinCos16 ),
    FSignature("cos16u"      , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.UWORD, ::builtinCos16u ),
+    FSignature("cosr8"       , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.BYTE, ::builtinCosR8 ),
+    FSignature("cosr8u"      , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.UBYTE, ::builtinCosR8u ),
+    FSignature("cosr16"      , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.WORD, ::builtinCosR16 ),
+    FSignature("cosr16u"     , true, listOf(FParam("angle8", arrayOf(DataType.UBYTE))), DataType.UWORD, ::builtinCosR16u ),
    FSignature("tan"         , true, listOf(FParam("rads", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg -> oneDoubleArg(a, p, prg, Math::tan) },
    FSignature("atan"        , true, listOf(FParam("rads", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg -> oneDoubleArg(a, p, prg, Math::atan) },
    FSignature("ln"          , true, listOf(FParam("value", arrayOf(DataType.FLOAT))), DataType.FLOAT) { a, p, prg -> oneDoubleArg(a, p, prg, Math::log) },
@@ -372,6 +380,24 @@ private fun builtinSin8u(args: List<Expression>, position: Position, program: Pr
    return NumericLiteralValue(DataType.UBYTE, (128.0 + 127.5 * sin(rad)).toInt().toShort(), position)
 }

+@Suppress("UNUSED_PARAMETER")
+private fun builtinSinR8(args: List<Expression>, position: Position, program: Program): NumericLiteralValue {
+    if (args.size != 1)
+        throw SyntaxError("sinr8 requires one argument", position)
+    val constval = args[0].constValue(program) ?: throw NotConstArgumentException()
+    val rad = constval.number.toDouble() / 180.0 * 2.0 * PI
+    return NumericLiteralValue(DataType.BYTE, (127.0 * sin(rad)).toInt().toShort(), position)
+}
+
+@Suppress("UNUSED_PARAMETER")
+private fun builtinSinR8u(args: List<Expression>, position: Position, program: Program): NumericLiteralValue {
+    if (args.size != 1)
+        throw SyntaxError("sinr8u requires one argument", position)
+    val constval = args[0].constValue(program) ?: throw NotConstArgumentException()
+    val rad = constval.number.toDouble() / 180.0 * 2.0 * PI
+    return NumericLiteralValue(DataType.UBYTE, (128.0 + 127.5 * sin(rad)).toInt().toShort(), position)
+}
+
@Suppress("UNUSED_PARAMETER")
 private fun builtinCos8(args: List<Expression>, position: Position, program: Program): NumericLiteralValue {
    if (args.size != 1)
@@ -390,6 +416,24 @@ private fun builtinCos8u(args: List<Expression>, position: Position, program: Pr
    return NumericLiteralValue(DataType.UBYTE, (128.0 + 127.5 * cos(rad)).toInt().toShort(), position)
 }

+@Suppress("UNUSED_PARAMETER")
+private fun builtinCosR8(args: List<Expression>, position: Position, program: Program): NumericLiteralValue {
+    if (args.size != 1)
+        throw SyntaxError("cosr8 requires one argument", position)
+    val constval = args[0].constValue(program) ?: throw NotConstArgumentException()
+    val rad = constval.number.toDouble() / 180.0 * 2.0 * PI
+    return NumericLiteralValue(DataType.BYTE, (127.0 * cos(rad)).toInt().toShort(), position)
+}
+
+@Suppress("UNUSED_PARAMETER")
+private fun builtinCosR8u(args: List<Expression>, position: Position, program: Program): NumericLiteralValue {
+    if (args.size != 1)
+        throw SyntaxError("cosr8u requires one argument", position)
+    val constval = args[0].constValue(program) ?: throw NotConstArgumentException()
+    val rad = constval.number.toDouble() / 180.0 * 2.0 * PI
+    return NumericLiteralValue(DataType.UBYTE, (128.0 + 127.5 * cos(rad)).toInt().toShort(), position)
+}
+
@Suppress("UNUSED_PARAMETER")
 private fun builtinSin16(args: List<Expression>, position: Position, program: Program): NumericLiteralValue {
    if (args.size != 1)
@@ -408,6 +452,24 @@ private fun builtinSin16u(args: List<Expression>, position: Position, program: P
    return NumericLiteralValue(DataType.UWORD, (32768.0 + 32767.5 * sin(rad)).toInt(), position)
 }

+@Suppress("UNUSED_PARAMETER")
+private fun builtinSinR16(args: List<Expression>, position: Position, program: Program): NumericLiteralValue {
+    if (args.size != 1)
+        throw SyntaxError("sinr16 requires one argument", position)
+    val constval = args[0].constValue(program) ?: throw NotConstArgumentException()
+    val rad = constval.number.toDouble() / 180.0 * 2.0 * PI
+    return NumericLiteralValue(DataType.WORD, (32767.0 * sin(rad)).toInt(), position)
+}
+
+@Suppress("UNUSED_PARAMETER")
+private fun builtinSinR16u(args: List<Expression>, position: Position, program: Program): NumericLiteralValue {
+    if (args.size != 1)
+        throw SyntaxError("sinr16u requires one argument", position)
+    val constval = args[0].constValue(program) ?: throw NotConstArgumentException()
+    val rad = constval.number.toDouble() / 180.0 * 2.0 * PI
+    return NumericLiteralValue(DataType.UWORD, (32768.0 + 32767.5 * sin(rad)).toInt(), position)
+}
+
@Suppress("UNUSED_PARAMETER")
 private fun builtinCos16(args: List<Expression>, position: Position, program: Program): NumericLiteralValue {
    if (args.size != 1)
@@ -426,6 +488,24 @@ private fun builtinCos16u(args: List<Expression>, position: Position, program: P
    return NumericLiteralValue(DataType.UWORD, (32768.0 + 32767.5 * cos(rad)).toInt(), position)
 }

+@Suppress("UNUSED_PARAMETER")
+private fun builtinCosR16(args: List<Expression>, position: Position, program: Program): NumericLiteralValue {
+    if (args.size != 1)
+        throw SyntaxError("cosr16 requires one argument", position)
+    val constval = args[0].constValue(program) ?: throw NotConstArgumentException()
+    val rad = constval.number.toDouble() / 180.0 * 2.0 * PI
+    return NumericLiteralValue(DataType.WORD, (32767.0 * cos(rad)).toInt(), position)
+}
+
+@Suppress("UNUSED_PARAMETER")
+private fun builtinCosR16u(args: List<Expression>, position: Position, program: Program): NumericLiteralValue {
+    if (args.size != 1)
+        throw SyntaxError("cosr16u requires one argument", position)
+    val constval = args[0].constValue(program) ?: throw NotConstArgumentException()
+    val rad = constval.number.toDouble() / 180.0 * 2.0 * PI
+    return NumericLiteralValue(DataType.UWORD, (32768.0 + 32767.5 * cos(rad)).toInt(), position)
+}
+
@Suppress("UNUSED_PARAMETER")
 private fun builtinSgn(args: List<Expression>, position: Position, program: Program): NumericLiteralValue {
    if (args.size != 1)
@@ -173,14 +173,18 @@ class CallGraph(private val program: Program) : IAstVisitor {
    }

    fun unused(decl: VarDecl): Boolean {
+        // Don't check assembly just for occurrences of variables, if they're not used in prog8 itself, just kill them
+        return usages(decl).isEmpty()
+    }
+
+    fun usages(decl: VarDecl): List<IdentifierReference> {
        if(decl.type!=VarDeclType.VAR || decl.autogeneratedDontRemove || decl.sharedWithAsm)
-            return false
+            return emptyList()

        if(decl.definingBlock !in usedBlocks)
-            return false
+            return emptyList()

-        val allReferencedVardecls = allIdentifiersAndTargets.filter { it.value is VarDecl }.map { it.value }.toSet()
-        return decl !in allReferencedVardecls // Don't check assembly just for occurrences of variables, if they're not used in prog8 itself, just kill them
+        return allIdentifiersAndTargets.filter { decl===it.value }.map{ it.key.first }
    }

    private fun nameInAssemblyCode(name: String) = allAssemblyNodes.any { it.assembly.contains(name) }
@@ -18,15 +18,15 @@ enum class ZeropageType {
    DONTUSE
 }

-data class CompilationOptions(val output: OutputType,
-                              val launcher: LauncherType,
-                              val zeropage: ZeropageType,
-                              val zpReserved: List<IntRange>,
-                              val floats: Boolean,
-                              val noSysInit: Boolean,
-                              val compTarget: ICompilationTarget
-) {
-    var slowCodegenWarnings = false
-    var optimize = false
-    var optimizeFloatExpressions = false
-}
+class CompilationOptions(val output: OutputType,
+                         val launcher: LauncherType,
+                         val zeropage: ZeropageType,
+                         val zpReserved: List<IntRange>,
+                         val floats: Boolean,
+                         val noSysInit: Boolean,
+                         val compTarget: ICompilationTarget,
+                         // these are set based on command line arguments:
+                         var slowCodegenWarnings: Boolean = false,
+                         var optimize: Boolean = false,
+                         var optimizeFloatExpressions: Boolean = false
+)
@@ -51,7 +51,7 @@ abstract class Zeropage(protected val options: CompilationOptions) {
    }

    fun allocate(scopedname: String, datatype: DataType, position: Position?, errors: IErrorReporter): Int {
-        assert(scopedname.isEmpty() || !allocations.values.any { it.first==scopedname } ) {"scopedname can't be allocated twice"}
+        require(scopedname.isEmpty() || !allocations.values.any { it.first==scopedname } ) {"scopedname can't be allocated twice"}

        if(options.zeropage== ZeropageType.DONTUSE)
            throw InternalCompilerException("zero page usage has been disabled")
@@ -18,11 +18,6 @@ dependencies {
    implementation 'org.jetbrains.kotlinx:kotlinx-cli:0.3.3'
    implementation "com.github.hypfvieh:dbus-java:3.3.1"
    implementation "org.slf4j:slf4j-simple:1.7.30"
-
-    testImplementation "org.jetbrains.kotlin:kotlin-test-junit5"
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.2'
-    testImplementation 'org.hamcrest:hamcrest:2.2'
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.2'
 }

 configurations.all {
@@ -0,0 +1,2 @@
+sphinx>=4.0
+sphinx_rtd_theme==1.0.0
@@ -40,7 +40,7 @@ def setup(app):

 # If your documentation needs a minimal Sphinx version, state it here.
 #
-needs_sphinx = '1.5.3'
+needs_sphinx = '4.0'

 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
@@ -704,6 +704,22 @@ cos16u(x)
 cos16(x)
   Fast 16-bit word cosine of angle 0..255, result is in range -32767..32767

+cosr8u(x)
+    Fast 8-bit ubyte cosine of angle 0..179 (each is a 2 degree step), result is in range 0..255
+    Angles 180..255 will yield a garbage result!
+
+cosr8(x)
+    Fast 8-bit byte cosine of angle 0..179 (each is a 2 degree step), result is in range -127..127
+    Angles 180..255 will yield a garbage result!
+
+cosr16u(x)
+    Fast 16-bit uword cosine of angle 0..179 (each is a 2 degree step), result is in range 0..65535
+    Angles 180..255 will yield a garbage result!
+
+cosr16(x)
+    Fast 16-bit word cosine of angle 0..179 (each is a 2 degree step), result is in range -32767..32767
+    Angles 180..255 will yield a garbage result!
+
 deg(x)
    Radians to degrees.

@@ -740,6 +756,22 @@ sin16u(x)
 sin16(x)
    Fast 16-bit word sine of angle 0..255, result is in range -32767..32767

+sinr8u(x)
+    Fast 8-bit ubyte sine of angle 0..179 (each is a 2 degree step), result is in range 0..255
+    Angles 180..255 will yield a garbage result!
+
+sinr8(x)
+    Fast 8-bit byte sine of angle 0..179 (each is a 2 degree step), result is in range -127..127
+    Angles 180..255 will yield a garbage result!
+
+sinr16u(x)
+    Fast 16-bit uword sine of angle 0..179 (each is a 2 degree step), result is in range 0..65535
+    Angles 180..255 will yield a garbage result!
+
+sinr16(x)
+    Fast 16-bit word sine of angle 0..179 (each is a 2 degree step), result is in range -32767..32767
+    Angles 180..255 will yield a garbage result!
+
 sqrt16(w)
    16 bit unsigned integer Square root. Result is unsigned byte.
    To do the reverse, squaring an integer, just write ``x*x``.
@@ -609,12 +609,14 @@ flag such as Carry (Pc).


 .. note::
-    The 'virtual' 16-bit registers from the Commander X16 can also be used as ``R0`` .. ``R15`` .
+    The 'virtual' 16-bit registers from the Commander X16 can also be specified as ``R0`` .. ``R15`` .
    This means you don't have to set them up manually before calling a subroutine that takes
    one or more parameters in those 'registers'. You can just list the arguments directly.
    *This also works on the Commodore-64!*  (however they are not as efficient there because they're not in zeropage)
    In prog8 and assembly code these 'registers' are directly accessible too via
-    ``cx16.r0`` .. ``cx16.r15``  (they're memory mapped uword values)
+    ``cx16.r0`` .. ``cx16.r15``  (these are memory mapped uword values),
+    ``cx16.r0s`` .. ``cx16.r15s``  (these are memory mapped word values),
+    and ``L`` / ``H`` variants are also available to directly access the low and high bytes of these.


 Expressions
@@ -6,18 +6,21 @@ For next compiler release (7.3)
 ...


-Blocked by Commander-x16 v39 release
-^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+Blocked by an official Commander-x16 v39 release
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 - simplify cx16.joystick_get2() once this cx16 rom issue is resolved: https://github.com/commanderx16/x16-rom/issues/203
  (I hope this will still be included into the final v39 roms release for the cx16)


 Future
 ^^^^^^
+- simplifyConditionalExpression() should not split expression if it still results in stack-based evaluation
+- remove special code generation for while and util expression
+  by rewriting while and until expressions into if+jump (consider them syntactic sugar)
+  but the result should not produce larger code ofcourse!
+- while-expression should now also get the simplifyConditionalExpression() treatment
 - fix the asm-labels problem (github issue #62)
- start migrating to KoTest library (github issue #70)
 - find a way to optimize asm-subroutine param passing where it now sometimes uses the evalstack?
- [complicated?] find a way to optimize if-statement codegen so that "if var & %10000" doesn't use evalstack & subroutine call, but also that the simple case "if X {...}" remains fast
 - document the various compiler command line options in more detail. See "Compiling program code" in the docs
 - get rid of all TODO's in the code
 - improve testability further, add more tests
@@ -0,0 +1,106 @@
+%import graphics
+
+; Note: this program is compatible with CX16 only.
+;       it doesn't work correctly on C64 because the bitmap screen data overlaps
+;       the program itself in memory $2000-...
+
+
+main {
+    const uword width = 320
+    const ubyte height = 200
+
+    sub start()  {
+        graphics.enable_bitmap_mode()
+
+        sincos255()
+        sys.wait(120)
+
+        graphics.clear_screen(1, 0)
+
+        sincos180()
+        sys.wait(120)
+
+        graphics.clear_screen(1, 0)
+        circles()
+
+        repeat {
+        }
+    }
+
+    sub sincos255() {
+        graphics.line(256,0,256,height-1)
+
+        ubyte pixelyb
+        uword pixelyw
+        ubyte pixelxb
+
+        for pixelxb in 0 to 255 {
+            pixelyb = cos8u(pixelxb) / 2
+            graphics.plot(pixelxb, pixelyb)
+            pixelyb = sin8u(pixelxb) / 2
+            graphics.plot(pixelxb, pixelyb)
+        }
+
+        for pixelxb in 0 to 255 {
+            pixelyw = cos16u(pixelxb) / 1024 + 120
+            graphics.plot(pixelxb, lsb(pixelyw))
+            pixelyw = sin16u(pixelxb) / 1024 + 120
+            graphics.plot(pixelxb, lsb(pixelyw))
+        }
+    }
+
+    sub sincos180() {
+        graphics.line(180,0,180,height-1)
+
+        ubyte pixelyb
+        uword pixelyw
+        ubyte pixelxb
+
+        for pixelxb in 0 to 179 {
+            pixelyb = cosr8u(pixelxb) / 2
+            graphics.plot(pixelxb, pixelyb)
+            pixelyb = sinr8u(pixelxb) / 2
+            graphics.plot(pixelxb, pixelyb)
+        }
+
+        for pixelxb in 0 to 179 {
+            pixelyw = cosr16u(pixelxb) / 1024 + 120
+            graphics.plot(pixelxb, lsb(pixelyw))
+            pixelyw = sinr16u(pixelxb) / 1024 + 120
+            graphics.plot(pixelxb, lsb(pixelyw))
+        }
+    }
+
+    sub circles() {
+        ubyte pixelyb
+        uword pixelxw
+        ubyte r
+
+        ; circles with "degrees" from 0 to 255
+        for r in 0 to 255 {
+            pixelxw = ((sin8(r)/2 as word) + 80) as uword
+            pixelyb = (cos8(r)/2 + height/2) as ubyte
+            graphics.plot(pixelxw, pixelyb)
+        }
+
+        for r in 0 to 255 {
+            pixelxw = (sin16(r)/1024 + 80) as uword
+            pixelyb = (cos16(r)/1024 + height/2) as ubyte
+            graphics.plot(pixelxw, pixelyb)
+        }
+
+        ; circles with half-degrees from 0 to 179 (=full degrees 0..358 with steps of 2 degrees)
+        for r in 0 to 179 {
+            pixelxw = (sinr8(r) as word /2 + 220) as uword
+            pixelyb = (cosr8(r)/2 + height/2) as ubyte
+            graphics.plot(pixelxw, pixelyb)
+        }
+
+        for r in 0 to 179 {
+            pixelxw = (sinr16(r) as word /1024 + 220) as uword
+            pixelyb = (cosr16(r)/1024 + height/2) as ubyte
+            graphics.plot(pixelxw, pixelyb)
+        }
+
+    }
+}
@@ -1,31 +1,65 @@
 %import textio
-; %import floats
-%zeropage basicsafe

 main {
-  sub start() {
-    word xx=0

-    if not xx {
-        txt.print("xx is zero\n")
+    sub start() {
+        ubyte xx=10
+
+        txt.print("if\n")
+        if xx-2 {
+            txt.print("in if\n")
+        }
+
+        txt.print("\nwhile\n")
+        xx=6
+        while xx-2 {
+            xx--
+            txt.print_ub(xx)
+            txt.spc()
+        }
+
+        txt.print("\nuntil\n")
+        xx=2
+        do {
+            xx++
+            txt.print_ub(xx)
+            txt.spc()
+        } until xx+2==10
+        txt.print("\ndone")
+
+        repeat {
+        }
    }

-    while not xx {
-        xx ++
-    }

-    do {
-        xx--
-    } until not xx
+;    if not iteration_in_progress or not num_bytes
+;        return

-    if not xx {
-        txt.print("xx is zero\n")
-    }
+;    word xx=0
+;    word[] xarr = [1,2,3]
+;    ubyte ai
+;
+;    if not @($c000) {
+;        txt.print("xx is zero\n")
+;    }
+;
+;    while not xarr[ai] {
+;        xx ++
+;    }
+;
+;    do {
+;        xx--
+;    } until not xarr[ai]
+;
+;    if not xarr[ai] {
+;        txt.print("xx is zero\n")
+;    }

 ;    ubyte yy=$30
 ;    ubyte zz=9
 ;    sys.memset(xx+200, yy*2, ~yy)
 ;
+;
 ;    if yy & %10000 {
 ;        yy++
 ;    }
@@ -43,5 +77,4 @@ main {
 ;    txt.nl()
 ;    floats.print_f(fa[1])

-  }
 }
@@ -22,11 +22,6 @@ dependencies {
    implementation "javax.json:javax.json-api:1.1.4"
    implementation "org.glassfish:javax.json:1.1.4"
    implementation "org.slf4j:slf4j-simple:1.7.30"
-
-    testImplementation "org.jetbrains.kotlin:kotlin-test-junit5"
-    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.2'
-    testImplementation 'org.hamcrest:hamcrest:2.2'
-    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.2'
 }

 configurations.all {
@@ -182,10 +182,10 @@ expression :
 	| left = expression EOL? bop = '|' EOL? right = expression
 	| left = expression EOL? bop = ('==' | '!=') EOL? right = expression
 	| rangefrom = expression rto = ('to'|'downto') rangeto = expression ('step' rangestep = expression)?	// can't create separate rule due to mutual left-recursion
+	| prefix = 'not' expression
 	| left = expression EOL? bop = 'and' EOL? right = expression
 	| left = expression EOL? bop = 'or' EOL? right = expression
 	| left = expression EOL? bop = 'xor' EOL? right = expression
-	| prefix = 'not' expression
 	| literalvalue
 	| scoped_identifier
 	| arrayindexed
@@ -2,5 +2,5 @@

 rm -f *.jar *.asm *.prg *.vm.txt *.vice-mon-list a.out
 rm -rf build out
-rm -rf compiler/build compilerAst/build dbusCompilerService/build httpCompilerService/build parser/build
+rm -rf compiler/build codeGeneration/build codeOptimizers/build compilerInterfaces/build compilerAst/build dbusCompilerService/build httpCompilerService/build parser/build
Author	SHA1	Message	Date
Irmen de Jong	5fd83f2757	version 7.3	2021-11-14 22:55:13 +01:00
Irmen de Jong	c80df4140b	until-loop condition now also simplified to avoid stack-eval	2021-11-14 22:51:02 +01:00
Irmen de Jong	53e1729e2f	introduce option to use internal scratch variables via prog8_lib definitions (ony for compiler, not for user code!)	2021-11-14 16:01:54 +01:00
Irmen de Jong	ab2d1122a9	conditional expressions are optimized more intelligently (simple ones are not split off in separate assignments)	2021-11-14 12:38:56 +01:00
Irmen de Jong	5190594c8a	added several more assembly-level optimizations to remove redundant instructions	2021-11-14 12:23:46 +01:00
Irmen de Jong	c858ceeb58	compiler shouldn't use cx16.r15 as temp var	2021-11-14 02:38:59 +01:00
Irmen de Jong	f0f52b9166	optimize typecasted binary expression to avoid even more estack use. also fix wrong parent crash in removal of unused variable's assignments.	2021-11-13 14:22:37 +01:00
Irmen de Jong	00c6f74481	tweak temp float	2021-11-13 12:56:59 +01:00
Irmen de Jong	2177ba0ed2	added signed versions of the cx16 virtual registers	2021-11-13 02:42:21 +01:00
Irmen de Jong	3483515346	preparing for more optimizations	2021-11-12 23:23:51 +01:00
Irmen de Jong	75a06d2a40	preparing for more optimizations	2021-11-12 02:17:37 +01:00
Irmen de Jong	53ac11983b	better unused variable removal	2021-11-11 03:03:21 +01:00
Irmen de Jong	69f4a4d4f8	tweak expr.typecastTo() a bit	2021-11-11 00:15:09 +01:00
Irmen de Jong	222bcb808f	optimize load-store-load combo in output asm	2021-11-10 23:47:35 +01:00
Irmen de Jong	686483f51a	fixed division of signed byte number by 2. (!)	2021-11-10 00:17:56 +01:00
Irmen de Jong	8df3da11e3	add cosr8, sinr8, cosr16 and sinr16 builtin functions that take a degree 0..179 (= 0..358 in 2 degree steps) to more easily scale halves/quarters etc of a circle than possible with the ones that take 0..255 'degrees'.	2021-11-09 23:39:26 +01:00
Irmen de Jong	84dafda0e4	fix error message for type mismatch on builtin-function parameter	2021-11-09 22:19:07 +01:00
Irmen de Jong	b909facfe5	fix compiler stackoverflow crash on certain typecasted expressions containing floats.	2021-11-09 19:31:19 +01:00
Irmen de Jong	7780d94de1	discovered crash related to float typecasting in asm assignment codegen	2021-11-09 03:45:07 +01:00
Irmen de Jong	f2c440e466	new sin/cos idea	2021-11-09 02:38:43 +01:00
Irmen de Jong	4937e004b5	fix compiler crash where it used wrong datatype in split assignment fixes crash for "ubyte bb ;; uword ww ;; bb = not bb or not ww"	2021-11-09 01:13:23 +01:00
Irmen de Jong	4cb383dccb	discovered crash about storage size mismatch	2021-11-08 21:44:06 +01:00
Irmen de Jong	c8a4b6f23c	refactor expressionsAsmGen so that it now has just 1 single public function this makes replacing it by a non-stack based solution easier in the future.	2021-11-08 19:21:55 +01:00
Irmen de Jong	857724c7e6	attempt to make if-statement not use stack eval anymore	2021-11-08 19:07:36 +01:00
Irmen de Jong	a9b0400d13	fixed 'not' operator priority: it now has higher priority as or/and/xor.	2021-11-08 18:38:04 +01:00
Irmen de Jong	2d1e5bbc7e	remove unimportant empty tests	2021-11-08 17:00:10 +01:00
Irmen de Jong	60627ce756	kotest migration done, fixes #70	2021-11-08 16:19:24 +01:00
Irmen de Jong	7961a09d16	converting compiler module's testcases to kotest assertions	2021-11-08 16:14:22 +01:00
Irmen de Jong	613efcacc7	converting compiler module's testcases to kotest (ongoing)	2021-11-08 15:08:48 +01:00
Irmen de Jong	7e8db16e18	moved to kotest assertions in compilerAst module tests	2021-11-07 21:18:18 +01:00
Irmen de Jong	1fbbed7e23	remove unittest machinery from modules that don't have tests	2021-11-07 17:34:14 +01:00
Irmen de Jong	984272beb4	migrated compilerAst module to KoTest (but not finished with the assertions yet)	2021-11-07 17:25:53 +01:00
Irmen de Jong	b9ce94bb68	migrated codeGeneration module to KoTest	2021-11-07 15:40:05 +01:00
Irmen de Jong	f4c4ee78d9	re-use global returnvalue temp var instead of duplicating it in every subroutine that needs it	2021-11-07 14:19:21 +01:00
Irmen de Jong	793596614e	attempt to fix ReadTheDocs build issue	2021-11-07 00:37:31 +01:00
Irmen de Jong	136280100c	attempt to fix ReadTheDocs build issue	2021-11-07 00:23:44 +01:00
Irmen de Jong	29f1e4d2c9	attempt to fix ReadTheDocs build issue	2021-11-07 00:18:51 +01:00
@@ -1 +1 @@
 .2
 .3