Libraries written in Kotlin are factored out into a separate project

libraries/testlib/module.kt

@@ -0,0 +1,11 @@
+import kotlin.modules.*
+
+fun project() {
+    module("testlib") {
+        // TODO how to refer to the dir of the module?
+        classpath += "dist/kotlinc/lib/kotlin-test.jar"
+        classpath += "kunit/lib/junit-4.9.jar"
+
+        addSourceFiles("test")
+    }
+}