Support test-scope resources

[jcogilvie]

Android has a little bit of support for this baked in, by way of the androidTest instrumentation tests. Anything in src/androidTest/res gets built into com.mypackage.test.R.java (alongside com.mypackage.R.java for production) when you run the gradle task compileDebugAndroidTestSources.

If you do this, you get a set of intermediate directories with androidTest as the build flavor.

See my StackOverflow question and answer here for the kind of changes I had to make to the robo gradle test runner to make it halfway work.

I think that we should have something gradle-wise that forces a build of test.R.java and ensures we load the correct resources.

(In my own personal case I've mapped src/test/res into the androidTest sourceSet's res folders for consistency's sake, but out-of-the-box it looks in src/androidTest/res.)

[jongerrish]

Android Studio now supports building resources for tests.