Espresso IdleResource UI Test

HomeFragmentUITest.kt

@LargeTest
@RunWith(AndroidJUnit4::class)
class HomeFragmentUITest {

    @get:Rule
    val activityTestRule = ActivityScenarioRule(MainActivity::class.java)

    @Before
    fun setUp() {
        IdlingRegistry.getInstance().register(EspressoIdlingResource.countingIdlingResource)
    }

    @After
    fun tearDown() {
        IdlingRegistry.getInstance().unregister(EspressoIdlingResource.countingIdlingResource)
    }

    @Test
    fun initial_state_home_screen_UI_test() {
        activityTestRule.scenario.moveToState(Lifecycle.State.RESUMED)
        onView(withId(R.id.home_photos_progress_container)).check(matches(not(isDisplayed())))
        onView(withId(R.id.home_photos_list)).check(matches(isDisplayed()))
    }
}