Why Should You Wrap LiveData With Your Own Abstraction - testing

ScreenViewTests.kt

@RunWith(AndroidJUnit4::class)
class ScreenViewTests {
    @get:Rule val testRule = createTestRuleWithFakeScreenViewInjector {
        presenter = mockPresenter
    }
    private val mockPresenter = mock(IScreenPresenter::class.java)

    @Test
    fun someTest() {
        val captor = lambdaArgumentCaptor<(String) -> Unit>()
        verify(mockPresenter.observeTitle(anyNonNull(), captor.capture()))
        val titleObserver = captor.value

        titleObserver("tests are fun")

        onView(withId(R.id.title)).check(matches(withText("tests are fun")))
    }
}

fun <T> anyNonNull(): T = Mockito.any<T>() as T
inline fun <reified T> lambdaArgumentCaptor() : ArgumentCaptor<T> = ArgumentCaptor.forClass(T::class.java)