Libraries written in Kotlin are factored out into a separate project

libraries/kunit/kunit.iml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src/main/kotlin" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="module-library" exported="">
+      <library>
+        <CLASSES>
+          <root url="jar://$MODULE_DIR$/lib/junit-4.9.jar!/" />
+        </CLASSES>
+        <JAVADOC />
+        <SOURCES />
+      </library>
+    </orderEntry>
+    <orderEntry type="module" module-name="stdlib" />
+  </component>
+</module>
+

libraries/kunit/module.kt

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+import kotlin.modules.*
+
+fun project() {
+    module("kunit") {
+        // TODO how to refer to the dir of the module?
+        classpath += "kunit/lib/junit-4.9.jar"
+
+        addSourceFiles("src/main/kotlin")
+    }
+}

libraries/kunit/src/main/kotlin/TestSupport.kt

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+package org.jetbrains.kotlin.junit
+
+import junit.framework.TestCase
+
+/**
+ * Useful base class for test cases using the old JUnit 3 naming convention of functions
+ * starting with "test*" as being a test case
+ */
+abstract class TestSupport() : TestCase() {
+}

libraries/kunit/src/main/kotlin/junit/JUnit.kt

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+package org.jetbrains.kotlin.test.junit
+
+import kotlin.test.Asserter
+import org.junit.Assert
+
+class JUnitAsserter : Asserter {
+    override fun assertEquals(message : String, expected : Any?, actual : Any?) {
+        Assert.assertEquals(message, expected, actual)
+    }
+
+    override fun assertNotNull(message : String, actual : Any?) {
+        Assert.assertNotNull(message, actual)
+    }
+
+    override fun assertNull(message : String, actual : Any?) {
+        Assert.assertNull(message, actual)
+    }
+
+    override fun assertTrue(message : String, actual : Boolean) {
+        Assert.assertTrue(message, actual)
+    }
+
+    override fun fail(message : String) {
+        Assert.fail(message)
+    }
+}