public async void GetAllSessionsAndSpeakers_ReturnsOkResult() { //Arrange SpeakerSessionCollection speakerSessionCollection = new SpeakerSessionCollection() { SpeakersList = new List <ResponseItem>() { new ResponseItem() { Id = 1 }, new ResponseItem() { Id = 2 } }, SessionsList = new List <ResponseItem>() { new ResponseItem() { Id = 1 }, new ResponseItem() { Id = 2 } } }; conferenceService.GetCollectionAsync().Returns(speakerSessionCollection); //act var result = await conferenceController.GetAllSpeakersAndSessions(); //Assert var viewResult = Assert.IsType <OkObjectResult>(result); var model = Assert.IsAssignableFrom <SpeakerSessionCollection>( viewResult.Value); Assert.Equal(2, model.SessionsList.Count); Assert.Equal(2, model.SpeakersList.Count); }