Test single component

RatesActivityComponentTest.java

@RunWith(AndroidJUnit4.class) @LargeTest public class RatesActivityShould {

  @Rule public ActivityTestRule<RatesActivity> rule =
      new ActivityTestRule<RatesActivity>(RatesActivity.class);

  @Test public void show_rates_widget_on_load() throws Exception {
    RatesActivity activity = rule.getActivity();
    activity.setContentView(new AwesomeTextView(activity));
    onView(isAssignableFrom(AwesomeTextView.class)).perform(typeText("ModerFoka"))
        .check(matches(withText("Mother of a Foca")));
  }
}