diff --git a/compiler/test/TestCompilerOnRanges.kt b/compiler/test/TestCompilerOnRanges.kt
index 73ce6f9a7..46b78da46 100644
--- a/compiler/test/TestCompilerOnRanges.kt
+++ b/compiler/test/TestCompilerOnRanges.kt
@@ -5,6 +5,7 @@ import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.TestFactory
 import org.junit.jupiter.api.TestInstance
 import prog8.ast.base.DataType
+import prog8.ast.base.Position
 import prog8.ast.expressions.*
 import prog8.ast.statements.ForLoop
 import prog8.ast.statements.Subroutine
@@ -265,5 +266,15 @@ class TestCompilerOnRanges {
         assertEquals(DataType.STR, iterable.inferType(program).getOr(DataType.UNDEFINED))
     }
 
+    @Test
+    fun 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.toConstantIntegerRange()
+    }
 }
 
diff --git a/compiler/test/ZeropageTests.kt b/compiler/test/ZeropageTests.kt
index 3aece32ae..7c77eaa58 100644
--- a/compiler/test/ZeropageTests.kt
+++ b/compiler/test/ZeropageTests.kt
@@ -15,6 +15,61 @@ 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 DummyCompilationTarget: ICompilationTarget {
+        override val name: String = "dummy"
+        override val machine: IMachineDefinition
+            get() = throw NotImplementedError("dummy")
+
+        override fun encodeString(str: String, altEncoding: Boolean): List<Short> {
+            throw NotImplementedError("dummy")
+        }
+
+        override fun decodeString(bytes: List<Short>, altEncoding: Boolean): String {
+            throw NotImplementedError("dummy")
+        }
+
+        override fun memorySize(dt: DataType): Int {
+            throw NotImplementedError("dummy")
+        }
+
+    }
+
+    class DummyZeropage(options: CompilationOptions) : Zeropage(options) {
+        override val SCRATCH_B1: Int = 0x10
+        override val SCRATCH_REG: Int = 0x11
+        override val SCRATCH_W1: Int= 0x20
+        override val SCRATCH_W2: Int = 0x30
+
+        init {
+            free.addAll(0..255)
+
+            removeReservedFromFreePool()
+        }
+    }
+
+}
+
+
 @TestInstance(TestInstance.Lifecycle.PER_CLASS)
 class TestC64Zeropage {
 
diff --git a/compilerInterfaces/test/TestAstExtensions.kt b/compilerInterfaces/test/TestAstExtensions.kt
deleted file mode 100644
index 54a042f4b..000000000
--- a/compilerInterfaces/test/TestAstExtensions.kt
+++ /dev/null
@@ -1,24 +0,0 @@
-package prog8tests.interfaces
-
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
-import prog8.ast.base.Position
-import prog8.ast.expressions.NumericLiteralValue
-import prog8.ast.expressions.RangeExpr
-import prog8.compilerinterface.size
-import kotlin.test.assertEquals
-
-
-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestAstExtensions {
-
-    @Test
-    fun 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())
-    }
-}
diff --git a/compilerInterfaces/test/TestZeropage.kt b/compilerInterfaces/test/TestZeropage.kt
deleted file mode 100644
index 7c065777a..000000000
--- a/compilerInterfaces/test/TestZeropage.kt
+++ /dev/null
@@ -1,62 +0,0 @@
-package prog8tests.interfaces
-
-import org.junit.jupiter.api.Test
-import org.junit.jupiter.api.TestInstance
-import prog8.ast.base.DataType
-import prog8.compilerinterface.*
-import kotlin.test.assertEquals
-
-
-@TestInstance(TestInstance.Lifecycle.PER_CLASS)
-class TestZeropage {
-
-    @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 DummyCompilationTarget: ICompilationTarget {
-        override val name: String = "dummy"
-        override val machine: IMachineDefinition
-            get() = throw NotImplementedError("dummy")
-
-        override fun encodeString(str: String, altEncoding: Boolean): List<Short> {
-            throw NotImplementedError("dummy")
-        }
-
-        override fun decodeString(bytes: List<Short>, altEncoding: Boolean): String {
-            throw NotImplementedError("dummy")
-        }
-
-        override fun memorySize(dt: DataType): Int {
-            throw NotImplementedError("dummy")
-        }
-
-    }
-
-    class DummyZeropage(options: CompilationOptions) : Zeropage(options) {
-        override val SCRATCH_B1: Int = 0x10
-        override val SCRATCH_REG: Int = 0x11
-        override val SCRATCH_W1: Int= 0x20
-        override val SCRATCH_W2: Int = 0x30
-
-        init {
-            free.addAll(0..255)
-
-            removeReservedFromFreePool()
-        }
-    }
-
-}
diff --git a/compilerInterfaces/test/readme.txt b/compilerInterfaces/test/readme.txt
new file mode 100644
index 000000000..4fac22136
--- /dev/null
+++ b/compilerInterfaces/test/readme.txt
@@ -0,0 +1,2 @@
+Unittests for things in this module are located in the Compiler module instead,
+for convenience sake.