How to mock objects created inside method?

Question

Consider this

public class UserManager {
    private final CrudService crudService;

    @Inject
    public UserManager(@Nonnull final CrudService crudService) {
        this.crudService = crudService;
    }

    @Nonnull
    public List<UserPresentation> getUsersByState(@Nonnull final String state) {
        return UserPresentation.getUserPresentations(new UserQueries(crudService).getUserByState(state));
    }

}

I want to mock out

new UserQueries(crudService)

so that I can mock out its behavior

Any ideas?

maybe this can help: docs.mockito.googlecode.com/hg/1.9.5/org/mockito/Spy.html — Arthur Julião
– Arthur Julião, Commented Oct 11, 2014 at 23:11

troig · Accepted Answer · 2014-10-12 08:16:52Z

11

With PowerMock you can mock constructors. See example

I'm not with an IDE right now, but would be something like this:

  UserQueries userQueries = PowerMockito.mock(UserQueries.class);
  PowerMockito.whenNew(UserQueries.class).withArguments(Mockito.any(CrudService.class)).thenReturn(userQueries);

You need to run your test with PowerMockRunner (add these annotations to your test class):

@RunWith(PowerMockRunner.class)
@PrepareForTest(UserQueries .class)

If you cannot use PowerMock, you have to inject a factory, as it says @Briggo answer.

Hope it helps

edited Oct 12, 2014 at 8:16

answered Oct 12, 2014 at 8:09

troig

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1 Comment

xxks-kkk Over a year ago

It seems like PowerMock can only work with Junit4

johnnyutts · Accepted Answer · 2014-10-11 23:14:03Z

You could inject a factory that creates UserQueries.

public class UserManager {
private final CrudService crudService;
private final UserQueriesFactory queriesFactory; 

@Inject
public UserManager(@Nonnull final CrudService crudService,UserQueriesFactory queriesFactory) {
    this.crudService = crudService;
    this.queriesFactory = queriesFactory;
}

@Nonnull
public List<UserPresentation> getUsersByState(@Nonnull final String state) {
    return UserPresentation.getUserPresentations(queriesFactory.create(crudService).getUserByState(state));
}

}

Although it may be better (if you are going to do this) to inject your CrudService into the factory.

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