Android Studio 3 does not run tests in Spock

Question

I updated Android Studio to version 3 and since then all my spock tests, when in a java module, do not run when trying to run them from inside the application (right click on groovy folder -> Run 'Tests in groovy'). I get a:

Class not found: "package.name.classname"Empty test suite."

Same if I try to run a single test.

If I run the test task from the gradle panel I get this: error. Cause: unknown.

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On the other hand:

• Any spock tests in android modules run fine.
• All my java tests in all my modules run fine.
• All my tests (spock and java) run fine when running them from outside AS using gradle (gradlew clean test).

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My setup:

• gradle v4.1
• android gradle plugin v3.0.0
• java version compatibility v1.8
• in my java modules i use the gradle groovy plugin
• in my android modules i use the groovy android gradle plugin

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A few things I tried after searching in both google and here:

• changing the android gradle plugin back to v2.3.3 and gradle to v3.3
• trying to copy all groovy classes to build/classes/java/test

Answer 1

So this is more of a workaround than an actual solution but it should give you your debugger back which is probably 90% of the value anyway:

You can run your test suite like:

./gradlew <module>:test --debug-jvm

And the jvm running your tests will suspend until a debugger attaches.

From Android Studio bring up the action chooser by pressing ctrl + shift + a (on linux anyway, check the equivalent for your OS) and select:

Attach to local process...

Once Android Studio attaches the tests will begin running.

The --debug-jvm flag can be used together with --tests to debug an individual test:

./gradlew <module>:test --tests fully.qualified.test.Test --debug-jvm