LoginActivityTest.java

@RunWith(AndroidJUnit4.class)
public class LoginActivityTest {

  @Rule public ActivityTestRule<LoginActivity> activityRule =
      new ActivityTestRule(LoginActivity.class);

  @Test public void useAppContext() throws Exception {
    Context appContext = InstrumentationRegistry.getTargetContext();
    assertEquals("com.example.ecgreb.mvpc", appContext.getPackageName());
  }

  @Test public void onLoginFormClick_shouldDisplayProgressView() throws Exception {
    onView(withId(R.id.login_form)).perform(click());
    onView(withId(R.id.login_progress)).check(matches(isDisplayed()));
  }
}