I’m trying to understand how that rule works, part...

# coroutines

[jean]

I’m trying to understand how that rule works, particularly this.coroutineContext[ContinuationInterceptor] as CoroutineDispatcher

class CoroutineTestRule : TestWatcher(), TestCoroutineScope by TestCoroutineScope() {

    override fun starting(description: Description?) {
        super.starting(description)
        Dispatchers.setMain(this.coroutineContext[ContinuationInterceptor] as CoroutineDispatcher)
    }

    override fun finished(description: Description?) {
        super.finished(description)
        Dispatchers.resetMain()
    }
}

What does it do exactly?
While debugging, I see that this.coroutineContext[ContinuationInterceptor] returns a TestCoroutineDispatcher , is that because the rule implement TestCoroutineScope which has a TestCoroutineDispatcher as default dispatcher?

[octylFractal]

yes, https://github.com/Kotlin/kotlinx.coroutines/blob/master/kotlinx-coroutines-test/src/TestCoroutineScope.kt#L49