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it only works with JVM test suites which only works with the Java ecosystem plugin, neither of which are compatible with Android

Yeah, but my question is if I apply the plugin in an Android or Kotlin Multiplaform project. Will the project work? I can run all tests, assemble, etc? Or does it fail?

try it and see. I expect it will not break anything immediately since it reacts to registrations which won't happen, but I don't know.

Reports not being aggregated can be fixed manually easily (I think)

you'd have to set up publishing the reports in the same way the plugin does, it's not that easy

I was thinking I was just to wire

Test

or

TestReport

tasks from Android and Kotlin with the next snippet somehow.

reporting {
    reports {
        val testAggregateTestReport by creating(AggregateTestReport::class) { 
            testType = TestSuiteType.UNIT_TEST
        }
    }
}

That snippet is at least one part. The other question is, whether the individual test results are published with the necessary attributes. But would also not too problematic.

do you know any public sample doing that?

No, but I did practically the same last week for the JaCoCo report aggregation plugin to get an aggregated report over all test types.