public void GetTop5ByRating_Should_WorkCorrect() { var db = new TFContext(DatabaseSimulator()); var genreServiceMock = new Mock <IGenreServices>(); var movieService = new MovieServices(db, genreServiceMock.Object); var movie = new Movie() { Id = 1, Title = "The Movie", Rating = 3.5f }; var secondMovie = new Movie() { Id = 2, Title = "The Movies", Rating = 5 }; var thirdMovie = new Movie() { Id = 3, Title = "Movie", Rating = 8 }; var fourthMovie = new Movie() { Id = 4, Title = "Movie", Rating = 3 }; var fifth = new Movie() { Id = 5, Title = "Movie", Rating = 1 }; var sixth = new Movie() { Id = 6, Title = "Movie", Rating = 2 }; db.Movies.AddRange (movie, secondMovie, thirdMovie, fourthMovie, fifth, sixth); db.SaveChanges(); float?ratingOfTheFirstOne = movieService.GetTop5ByRating().First().Rating; float?ratingOfTheLastOne = movieService.GetTop5ByRating().Last().Rating; Assert.AreEqual(5, movieService.GetTop5ByRating().Count()); Assert.AreEqual(8, ratingOfTheFirstOne); Assert.AreEqual(2, ratingOfTheLastOne); }