// THE TEST

	@Test
	public void testOnLoginSuccessful() throws Exception {
		// view
		MainView view = mockActiveView(MainView.class);
		when(view.getPassword()).thenReturn("mockuser");
		when(view.getPassword()).thenReturn("mockpass");
		// presenter
		MainPresenter presenter = new MainPresenter();
		presenter.useView(view);

		presenter.onLogin();

		verify(view).loggingIn();
		verify(view).onLoginSuccessful(any(User.class));
	}

// THE PRESENTER onLogin

	public void onLogin() {
		MainView view = getView();
		if (view == null) {
			return;
		}

		CharSequence username = view.getUsername();
		CharSequence password = view.getPassword();
		LoginRequest request = new LoginRequest(username, password);

		mDevelopingService.login(request)
			.observeOn(AndroidSchedulers.mainThread())
			.subscribe(
				this::onLoginResult,
				this::onLoginError
			);

		view.loggingIn();
	}