public void DeleteMovie_ValidMovie_RemovesMovieFromContextAndSavesChanges()
{
// ARRANGE
var movieToDelete = _movies.FirstOrDefault();
_mockMovieDbSet.Setup(m => m.Find(movieToDelete.Id)).Returns(movieToDelete);
// ACT
_dal.DeleteMovie(movieToDelete.Id);
// ASSERT
_mockMovieDbSet.Verify(m => m.Remove(movieToDelete), Times.Once);
_mockDbContext.Verify(m => m.SaveChanges(), Times.Once);
}