diff --git a/app/src/main/kotlin/android/emu6502/app/MainActivity.kt b/app/src/main/kotlin/android/emu6502/app/MainActivity.kt
index 458612b..65bdea5 100644
--- a/app/src/main/kotlin/android/emu6502/app/MainActivity.kt
+++ b/app/src/main/kotlin/android/emu6502/app/MainActivity.kt
@@ -31,9 +31,7 @@ class MainActivity : AppCompatActivity() {
       emulator.cpu.run()
     }
 
-    btnReset.setOnClickListener {
-      emulator.reset()
-    }
+    btnReset.setOnClickListener { emulator.reset() }
 
     val onClickButton = { code: Int ->
       emulator.cpu.memory.storeKeypress(code)
diff --git a/app/src/test/kotlin/android/emu6502/nes/INESFileParserTest.kt b/app/src/test/kotlin/android/emu6502/nes/INESFileParserTest.kt
index 18ee898..c34c766 100644
--- a/app/src/test/kotlin/android/emu6502/nes/INESFileParserTest.kt
+++ b/app/src/test/kotlin/android/emu6502/nes/INESFileParserTest.kt
@@ -7,7 +7,7 @@ import org.junit.Test
 import java.io.File
 
 class INESFileParserTest {
-  val tempFile: File = File.createTempFile("foo", "bar")
+  private val tempFile = File.createTempFile("foo", "bar")
 
   @Before fun setUp() {
     tempFile.writeBytes((0..40).map(Int::toByte).toByteArray())
@@ -22,7 +22,7 @@ class INESFileParserTest {
   }
 
   @Test fun validHeader() {
-    val testRom = javaClass.classLoader.getResource("roms/testrom.nes").toURI()
+    val testRom = javaClass.classLoader!!.getResource("roms/testrom.nes").toURI()
     val header = INESFileParser.parseFileHeader(File(testRom).inputStream())
     assertThat(header).isEqualTo(INESFileHeader(
         INESFileParser.INES_FILE_MAGIC, 0x10, 0x10, 0x40, 0x0, 0x0, INESFileParser.PADDING))
@@ -30,7 +30,7 @@ class INESFileParserTest {
   }
 
   @Test fun testMapper() {
-    val testRom = javaClass.classLoader.getResource("roms/testrom.nes").toURI()
+    val testRom = javaClass.classLoader!!.getResource("roms/testrom.nes").toURI()
     val cartridge = INESFileParser.parseCartridge(File(testRom))
     // super mario bros 3 is Mapper 4 (MMC3)
     assertThat(cartridge.mapper).isEqualTo(4)