Android tests don't compile when Kotlin classes are referenced

[Kirill Rakhman]

I'm following the guide over at http://kotlinlang.org/docs/reference/using-gradle.html and have successfully added the Kotlin plugin to my Android's application build script. I've added the kotlin folder to the app's source set like this:

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

And I can launch my app and use Kotlin classes without problems.

However, if I try to run the tests, the compilation fails with the following output:

JavaClassTest.java:14: error: package package.name does not exist
import package.name.KotlinClass;
                               ^
JavaClassTest.java:32: error: cannot find symbol
    private KotlinClass getResult() {
            ^
  symbol:   class KotlinClass
  location: class JavaClassTest

When running with --debug flag, the folder "build\tmp\kotlin-classes\debugTest" seems to be part of the class path, but this folder doesn't exist. However the folder "build\tmp\kotlin-classes\debug" is there and contains all the necessary classes.

I would really appreciate some help, since I'm not the biggest Gradle pro. Thanks in advance.

Cross reference to StackOverflow: http://stackoverflow.com/questions/26340426/android-unit-test-of-kotlin-class-fails-with-cannot-find-symbol-class

[Xavier Ducrohet]

The android plugin for gradle isn't really compatible with other java-based plugin (for now).

This means that the kotlin plugin cannot plug into the tasks created by our plugins. You'd have to do a custom plugin for kotlin that works exclusively with our plugin.

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Xavier Ducrohet
Android SDK Tech Lead
Google Inc.
http://developer.android.com | http://tools.android.com

Please do not send me questions directly. Thanks!

[Kirill Rakhman]

What I ended up doing was adding a custom task to copy the content of the debug folder into
debugTest and adding a dependency to the compileDebugTestJava task. The script looks something like this:

afterEvaluate { project ->
    project.tasks.findAll {
        it.name.startsWith('compile') && it.name.endsWith('DebugTestJava')
    }.each { Task task ->
        task.dependsOn copyKotlinToTest
    }
}

task copyKotlinToTest(type: Copy) {
    from new File(buildDir, 'tmp/kotlin-classes/debug')
    into new File(buildDir, 'tmp/kotlin-classes/debugTest')
}

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