Dependencies problem: TestMainDispatcher is not set as main dispatcher, have Dispatchers.Main[missing] instead.

[MarcinMoskala]

Using Dispatchers.setMain and Dispatchers.Main makes tests fail with:

Error: XXX: TestMainDispatcher is not set as main dispatcher, have Dispatchers.Main[missing] instead.

The simplest code to reproduce this problem:

https://pl.kotl.in/06K0zWkU2

class NewsViewModelTest {
    @Test
    fun test() {
        val dispatcher = StandardTestDispatcher()
        Dispatchers.setMain(dispatcher)
        var a = 0
        CoroutineScope(Dispatchers.Main + SupervisorJob()).launch {
            delay(1000)
            a = 1
        }
        dispatcher.scheduler.advanceUntilIdle()
        assertEquals(1, a)
    }
}

Seems that the coroutines and coroutines-test versions do not match.

[dkrasnoff]

Hey @MarcinMoskala, thanks for bringing this issue to our attention!
Yeah, you're totally right about different versions of coroutines and coroutines-test. We know it, but we can not currently update the version due to infrastructure reasons.
However, we are working on it, and I hope to return to you with an update soon.