Wsrtjtyk

Suppose you have a custom coroutine scope:

class MyScope(override val coroutineContext: CoroutineContext) : CoroutineScope

Within a class you then have a function setting a global value:

fun runSomething() {

    scope.launch {

        value = async { "some calculated value" }.await()

    }

}

Like this I can control context within scope. But when I want to test runSomething(), the tests might fail due to the async calls:

@Test

fun `runSomething should set value`() {

    runSomething()



    assertEquals("some calculated value", value)

}

How can I run all couroutine executions blocking within runSomething()?

Since you have the scope available, this should work:

runBlocking { scope.coroutineContext[Job]!!.join() }

I'd like to add another detail: your async { stuff }.await() does nothing since it starts another coroutine in the same context. On Android the scope's default dispatcher uses the GUI thread and you should send your blocking operation to a thread pool (Dispatchers.IO). Furthermore, you don't need async-await, but just

value withContext(Dispatchers.IO) { "some calculated value" }