How to correctly mock ViewModel on androidTest

Question

I\'m currently writing some UI unit tests for a fragment, and one of these @Test is to see if a list of objects is correctly displayed, this is not an integ

Answer 1

Within your test setup you'll need to provide a test version of the FavoritesViewModelFactory which is being injected in the Fragment.

You could do something like the following, where the Module will need to be added to your TestAppComponent:

@Module
object TestFavoritesViewModelModule {

    val viewModelFactory: FavoritesViewModelFactory = mock()

    @JvmStatic
    @Provides
    fun provideFavoritesViewModelFactory(): FavoritesViewModelFactory {
        return viewModelFactory
    }
}

You'd then be able to provide your Mock viewModel in the test.

fun setupViewModelFactory() {
    whenever(TestFavoritesViewModelModule.viewModelFactory.create(FavoritesViewModel::class.java)).thenReturn(viewModel)
}