An integration test for the RegistrationActivity

RegistrationTest.java

public class RegistrationTest {

	//mocks
	@Mock Storage mockStorage;
	@Mock RegistrationService mockRegistrationService;
	@Mock RegistrationContract.View mockView;

	//system under test
	RegistrationContract.Interactor interactor;
	RegistrationContract.Presenter presenter;

	@Before
	public void setUp() {
		MockitoAnnotations.initMocks(this);

		presenter = new RegistrationPresenter(mockRegistrationService, mockStorage);
		presenter.takeView(mockView);
		interactor = new RegistrationInteractor(presenter);
	}

	@Test
	public void givenNoInternet_whenClickRegisterButton_thenShowsAlertDialogWithMessage() {
		//arrange
		when(mockRegistrationService.register(any(RegistrationDTO.class)).thenThrow(new ConnectException());

		//act
		interactor.onRegisterButtonClick("username", "password");

		//assert
		verify(view).showMessage("No internet available.");
	}
}