How can I invoke lambdas in Unit Tests with MockK?...

# announcements

[Andreas Jost]

How can I invoke lambdas in Unit Tests with MockK?
I'm listening to changes of my view in the presenter's function onViewAttached(view), e.g. onLoginListener:

view.onLoginListener = {
    launch {
        val user = view.userTextField.getTextProperty()
        val pass = view.passTextField.getTextProperty()

        val result = doLogin(user, pass)
        // ...
    } 
}

It works perfectly fine on Android and iOS devices, but I can't get tests running. If I invoke view.onLoginListener in the test function, nothing happens. The presenter doesn't run the code block. Here is an excerpt of my test class: (see reply in thread)

[Andreas Jost]

class LoginPresenterTest {
    private lateinit var presenter: LoginPresenter

    @MockK
    lateinit var view: LoginView

    private val user = "MyUser"
    private val pass = "MyPass"

    @MockK
    lateinit var doLogin: DoLogin

    @Before
    fun onSetup(): Unit = MockKAnnotations.init(this).also {
        @ExperimentalCoroutinesApi
        Dispatchers.setMain(Dispatchers.Default)

        presenter = LoginPresenter(doLogin)

        coEvery { doLogin("MyUser", "MyPass") } returns LoginResult.Success

        every { view.onLoginListener = any() } just Runs
        every { view.onLoginListener } returns {}
        every { view.userTextField.getTextProperty() } returns user
        every { view.passTextField.getTextProperty() } returns pass
    }

    @Test
    fun onLoginSuccess() {
        runBlocking { presenter.attachView(view) }

        view.onLoginListener()

        coVerify {
            view.userTextField.getTextProperty()
            view.passTextField.getTextProperty()

            doLogin(user, pass)

            view.startHomeView()
        }
    }
}