Calling callbacks with Mockito

Question

I have some code

service.doAction(request, Callback callback);

How can I using Mockito grab the callback object, and call c

Answer 1

If you have a method like:-

public void registerListener(final IListener listener) {
    container.registerListener(new IListener() {
        @Override
        public void beforeCompletion() {
        }

        @Override
        public void afterCompletion(boolean succeeded) {
            listener.afterCompletion(succeeded);
        }
    });
}

Then following way you can mock the above method easily :-

@Mock private IListener listener;

@Test
public void test_registerListener() {
    target.registerListener(listener);

    ArgumentCaptor listenerCaptor =
            ArgumentCaptor.forClass(IListener.class);

    verify(container).registerListener(listenerCaptor.capture());

    listenerCaptor.getValue().afterCompletion(true);

    verify(listener).afterCompletion(true);
}

I hope this might help someone, as i had spend lot of time in figuring out this solution