Notite despre Mockito

1. Diferenta intre mock si spy

• Mock "falsifica" toate metodele unei clase
• Spy "falsifica" numai metodele declarate cu when, restul se apeleaza normal

ex:
final DataLoadingService dataLoadingService = spy(DataLoadingService.class);
dataLoadingService.setData(data); // executata normal
when(dataLoadingService.isExecutedWithUI()).thenReturn(false); // va returna intotdeauna false


2. Captare de argumente

final ArgumentCaptor<List> argumentCaptor = ArgumentCaptor.forClass(TypeOfTheParam.class);
doAnswer(param -> {
            final TypeOfTheParam argument = argumentCaptor.getValue();
            // do some action
            return null;
       }).when(dataLoadingService).execute(argumentCaptor.capture(), any(AnotherParamType.class));

SAU (mai simplu, fara ArgumentCaptor):

doAnswer(param -> {
            final ParamType arg1 = param.getArgument(0);
            final AnotherParamType arg2 = param.getArgument(1);
            // do some action
            return null;
       }).when(dataLoadingService).execute(any(ParamType.class), any(AnotherParamType.class));


3. Inject

private TypeA objectA = mock(TypeA.class);
private TypeB objectB = mock(TypeB.class);

@InjectMocks
private ContainingObject mainObject; // objectA & B will be injected there
// provided that (unique) objects of type A and B are fields inside mainObject


4. Verify

Este folosit pentru a verifica daca s-a intrat intr-o metoda a clasei mock-uite, si de cate ori.

ex:
final Runnable callback = mock(Runnable.class);
viewModel.clearAllData(callback);
verify(callback, times(1)).run(); // run este o metoda din callback (specifica unui Runnable)
// verify that method run  from the callback is called exactly once