public void Index()
{
// Arrange
var mockTwitterService = MockRepository.GenerateMock<ITwitterService>();
mockTwitterService.Stub(x => x.GetaRecentTweets()).Return(new List<Tweet>(){new Tweet()});
var controller = new HomeController(new InMemoryRepository(), null, mockTwitterService);
// Act
var model = controller.Index().As<ViewResult>().ViewData.Model;
// Assert
Assert.IsTrue(model is HomeIndexModel);
}