ErrorMockito.java

  
    @Mock MainView mainViewMock;
    @Mock PokeDataSource pokeDataSource;
    @Mock HttpException httpException;

    @Test
    public void testDemoResponseError404() {
        reset(mainViewMock);

        MainPresenterImpl presenter = new MainPresenterImpl(schedulersProvider, pokeDataSource);


        when(httpException.code()).thenReturn(HttpURLConnection.HTTP_NOT_FOUND);
        when(pokeDataSource.getPokemonAbilityStringObservable(anyString()))
                .thenReturn(Observable.<String>error(httpException));


        presenter.onViewAdded(mainViewMock, null);

        testScheduler.triggerActions();

        verify(mainViewMock, times(1)).showErrorDialog("Lost!");
        verify(mainViewMock, times(0)).setApiText(anyString());
    }