How do I test gwtp addToPopupSlot?

I have a gwtp presenter, in some cases it must add to popupslot another presenter.

How can I verify this fact in test?

I'm using Jukito for tests.

Presenter's code:

...
@Override
public void onAddPersonClick() {
    editPersonPresenter.initForCreating();
    addToPopupSlot(editPersonPresenter);
}
...

Test:

@RunWith(JukitoRunner.class)
public class PersonsPagePresenterTest {

    @Inject
    PersonPagePresenter personPagePresenter;

    @Test
    public void testAddPersonClick() {
        personPagePresenter.onAddPersonClick();
        //how to verify addToPopupSlot(editPersonPresenter);?
    }
}

The problem is that all injected presenters in test are not mocks (only their views are mocks)

You'll need to spy the instance using mockito since you want to verify that an instance method is called. Notice that I removed the @Inject on the PersonPagePresenter field as it's injected through the setUp method

@RunWith(JukitoRunner.class) 
public class PersonsPagePresenterTest {
    PersonPagePresenter personPagePresenter;

    @Before
    public void setUp(PersonPagePresenter personPagePresenter) {
        this.personPagePresenter = Mockito.spy(personPagePresenter);
    }

    @Test
    public void testAddPersonClick() {
        personPagePresenter.onAddPersonClick();

        Mockito.verify(personPagePresenter).addToPopupSlot(editPersonPresenter);
    } 
}