public void Exists_Should_ReturnTrueWhenExistAndFalseWhenDoesNot()
{
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"
};
bool doesNotExist = movieService.Exists(1);
db.Movies.Add(movie);
db.SaveChanges();
bool exist = movieService.Exists(1);
Assert.IsFalse(doesNotExist);
Assert.IsTrue(exist);
}