Is there any configuration we have to do when usin...

# coroutines

[Joan Colmenero]

Is there any configuration we have to do when using mockito and suspend fun? I remember when I did unit testing with rxJava I had to create a Rule and things like that, do I have to do something special to make it work?
Note: I'm using MVP not MVVM I don't know if it's a good point

[tseisel]

You can mock and verify suspending functions with Mockito just like you'd do with regular functions.
Note that it is only supported as of Mockito 2.23.

[Joan Colmenero]

Where I can find an example? It's my first time mocking suspend functions and coroutines, do you know any?

[tseisel]

Can't find blog posts on the subject, but I wrote some tests using Mockito myself : https://github.com/thibseisel/android-odeon/blob/746beead1ff3bda710e7862bd0d05fbbc74c3e29/media/src/test/java/fr/nihilus/music/media/actions/DeleteActionTest.kt#L126
From that test, you can see how to
- create a mock for a dependency of the object under test (@Mock annotation with MockitoRule),
- stub a suspending method of that mock, so that it returns an expected result (given(...).willReturn(...)),
- verify that a suspend method of that mock has been called (verify(...)).

[Joan Colmenero]

And what's that? : private val dispatcher = TestCoroutineDispatcher()

[tseisel]

That's a CoroutineDispatcher designed for testing. Most of the time, you only need runBlockingTest. All of those are available in kotlinx-coroutines-test : https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-test/