public void CanGetListOfEventsThatHaveBeenAttended() { var eventRepository = MockRepository.GenerateStub<IEventRepository>(); var eventList = new List<EventDto> {new EventDto(), new EventDto(), new EventDto()}; eventRepository .Expect(e => e.GetListOfCompletedEvents(1)) .Return(eventList); IEventService eventService = new EventService(eventRepository); var sut = eventService.GetListOfCompletedEvents(1); Assert.That(sut.Count(), Is.EqualTo(3)); }