How to test swiping between Activities in Espresso?

Issue

I am creating a test in Espresso that calls swipeRight() to go to the MainActivity where behavior is set before returning to ConsumerSettingsActivity to test Views. However, the issue is that after calling the swipe, I get a NoActivityResumedException that points to the second tested line with R.id.mode_text.

@RunWith(AndroidJUnit4.class)
public class ConsumerSettingsActivityTest {

private ConsumerSettingsActivity mConsumerSettingsActivity;

@Rule
public ActivityTestRule<ConsumerSettingsActivity> mActivityTestRule =
        new ActivityTestRule<>(ConsumerSettingsActivity.class);

@Before
public void initialize() {
    mConsumerSettingsActivity = mActivityTestRule.getActivity();
}

@Test
public void checkCorrectButtonsAreClickableInPhotoModeThenReturnToMainActivity() {

    // swipe to MainActivity and set behavior
    onView(allOf(withId(R.id.settings_top_bar), isDisplayed())).perform(swipeRight());
    onView(withId(R.id.mode_text)).perform(click());
    onView(withId(R.id.photo_mode)).perform(click());


    // test ratio Views
    onView(withId(R.id.ratio_full)).check(matches(isClickable()));
    onView(withId(R.id.ratio_full)).perform(click());
    onView(withId(R.id.ratio_square)).check(matches(isClickable()));
    onView(withId(R.id.ratio_square)).perform(click()); 
...
}
}

Solution

Short answer: MainActivity was called without being created.

Long answer: When ConsumerSettingsActivity called swipe to change to MainActivity, the actual swiping called finish(). Since MainActivity was not created, a NoActivityResumedException was thrown. To solve this, the test was changed to start with MainActivity, where it would then swipe to ConsumerSettingsActivity. Also, I did not need to make the thread sleep to be able to swipe between Activities.

Answered By - clever_trevor