I'm trying to test that my code correctly responds...

# coroutines

[Brendan Campbell-hartzell]

I'm trying to test that my code correctly responds if a launched coroutine fails, but the failure in the coroutine causes subsequent tests to fail due to a "Delayed Exception." If I try to handle the exception in the test code, then the failure won't propagate to my prod code. I'm not sure how to catch an error from the prod code so that the tests aren't failing due to the intended test error. Any ideas? Code in thread.

[Brendan Campbell-hartzell]

Test (which doesn't fail, but subsequent tests fail because of this error)

fun `should enable inputs`() {
    val job by lazy {
        CoroutineScope(Dispatchers.Default).launch {
            error("Intended async error")
        }
    }

    behavior = { job }

    interact {
        view.nameInput.text = "Banana"
        view.timeInput.valueFactory.value = 0L
        view.submitButton.fire()
    }

    runBlocking {
        job.join()
    }

    assertThat(view.nameInput).isEnabled
    assertThat(view.timeInput).isEnabled
}

[Brendan Campbell-hartzell]

Prod code:

private fun submit() {
        nameInput.isDisable = true
        timeInput.isDisable = true

        val nonBlankName = NonBlankString.create(nameInput.text) ?: return
        CoroutineScope(Dispatchers.JavaFx).launch {
            try {
                createStoryEventController.createStoryEvent(nonBlankName).join()
            } catch (t: Throwable) {

            }

            nameInput.isDisable = false
            timeInput.isDisable = false
        }/*
        createStoryEventController.createStoryEvent(nonBlankName).invokeOnCompletion { potentialFailure ->
            runBlocking {
                nameInput.isDisable = false
                timeInput.isDisable = false
            }
        }*/
    }

[Brendan Campbell-hartzell]

The createStoryEventController returns a Job and the behavior property in the tests is what's being called/returned by the mocked createStoryEventController

[Brendan Campbell-hartzell]

On reading more of the documentation, I was able to get the tests to stop failing (unexpectedly, that is) by providing a default CoroutineExceptionHandler . For anyone else curious, here's where I found it:
https://kotlinlang.org/docs/exception-handling.html#cancellation-and-exceptions