I have ``` private val testCoroutineDispatcher = ...

# coroutines

[Eugen Martynov]

I have

private val testCoroutineDispatcher = TestCoroutineDispatcher()
  private val testCoroutineScope = TestCoroutineScope(testCoroutineDispatcher)

I try to run suspend function in it

fun runBlockingTest(block: suspend TestCoroutineScope.() -> Unit) =
    testCoroutineScope.runBlockingTest { block() }

And particular is

dispatcherRule.runBlockingTest {
      val msg = Gallery.Effects.LoadGallery.run.invoke(this, Gallery.Deps(photoGalleryManager))
      assertThat(msg).isEqualTo(Gallery.Msg.FilesLoaded(failure))
    }

I’m getting

This job is not completed yet

Even if I change it to:

private val testCoroutineScope = TestCoroutineScope(testCoroutineDispatcher + Job())

I still get that exception, what can I do?
If I run test inside the global scope then test pass

[bohsen]

Found these cases extremely difficult to solve. Only option I've found is going back to runBlocking.

kotlinx-coroutines-test artifact definitely needs some work.

[bohsen]

Really good ressource on testing is this: https://www.droidcon.com/media-detail?video=481196790

[Eugen Martynov]

I’m on the stage when I finally understand difference between job and dispatcher. But I still learning the mechanics that happens when launching coroutine in scope, threading around it and etc. The source code is available and it is the best place for truth. But I wonder if there is good course, book or resource where it is just explained step by step.

[Eugen Martynov]

Another observation if I have next in my test it runs at least 2 seconds

runBlocking(GlobalScope.coroutineContext) {
      val msg = suspendedFunction()      assertThat(msg).isEqualTo(Gallery.Msg.FilesLoaded(failure))
    }