I have a test for my ViewModel in android. everyth...

# coroutines

[Colton Idle]

I have a test for my ViewModel in android. everything works fine.

I had to add a

closeableScope.launch {

}

and now that I did that, my test times out. if i remove the blah.collectLatest {} then it passes. Anyone have tips on what to do in this scenario. im still a rookie when it comes to testing, especially coroutines/flows

[mkrussel]

runTests waits for all child jobs to finish. If nothing cancels the launched job and if the flow doesn't complete, then the job will keep running and the test will time out.

[franztesca]

Pass the backgroundScope to the viewModel instead of the runTest one.

[mkrussel]

I didn't know about that, seems useful

[Colton Idle]

hm... let me try it out. i am injecting a closeableScope to my VM to make it testable and get around all of the Main.dispatcher stuff. but I typically pass in the runTest { coroutineContext } into the VM as the closeableScope

[Colton Idle]

interesting. yeah that worked @franztesca!

HomeViewModel(
    appStateHolder = fakeAppStateHolder,
    closeableScope = CloseableCoroutineScope(backgroundScope.coroutineContext),

[Peter Farlow]

For anyone reading this, make sure your test class only has one instance of TestScope. Using the top-level runTest function is totally fine, but if you do, make sure you don’t also call val scope = TestScope() anywhere in else in test file. If you need a reference to a TestScope, you can instantiate one yourself and instead use fun myTest = testScope.runTest { } instead of the top-level runTest function.
https://slack-chats.kotlinlang.org/t/3157046/the-android-coroutine-testing-https-developer-android-com-ko