I'm trying to set up feature variants, and I want to test the features separately. I tried using the JVM test suites plugin, but the tests sources can't see files in the main sources. I would like something like this:

val foo by sourceSets.creating {
  // main 'foo' sources
}

val fooTest by sourceSets.creating {
  // tests for the main 'foo' source set
  extendsFrom(foo) // make the foo code visible in the foo tests
}

Are there any examples for extending one custom source set with another? StackOverflow is full of answers that seem hacky and non-idiomatic.

I've tried variations of that, but no joy yet

testing {
    suites.create<JvmTestSuite>("fooTest") {
        dependencies {
            implementation(project(project.path)) {
                val cap = provider { "${group}:${name}-foo" }
                capabilities { requireCapability(cap) }
            }
        }
    }
}

never tried before, but what goes wrong with that?

compilation fails because classes from

src/foo

aren't visible in

src/fooTest

I'd honestly expect that

implementation(project) {
    capabilities { ... }

would set it up right but hmm

I think that all dependencies are resolved correctly, except for

gradleTestKit()

. It's just classes from

src/foo

that are missing.