Is there any way / workaround to test `kotlinx-coroutines-reactive`-based coroutines using `runBlock...

# coroutines

[Marc Knaup]

Is there any way / workaround to test kotlinx-coroutines-reactive-based coroutines using runBlockingTest?

The related issue (https://github.com/Kotlin/kotlinx.coroutines/issues/1204) and pull request (https://github.com/Kotlin/kotlinx.coroutines/pull/1206) seem to be abandoned for a long time.

[Giorgos Neokleous]

What are you trying to test?

[Marc Knaup]

I've wrapped an RxJava based API as a coroutines based API using said library. However I cannot test any code where that API is involved because the coroutine testing dispatcher doesn't seem to support it.

[Giorgos Neokleous]

If you are wrapping to Flows, I recommend Turbine. I also I found this article extremely useful for understanding how to go about testing Flows.

[Marc Knaup]

Interesting 🙂
But I’m not testing any Flow here though.

[Marc Knaup]

Found an ugly workaround 😅

launch { delay(100); repeat(100) { Thread.sleep(10); yield() } }

right before calling my reactive-based coroutines. That gives these coroutines a chance to complete their work before the test dispatcher is responsive again, which avoids the problem.

[Marc Knaup]

runBlocking {} also helps ❤️