public void MockCanAddDvd()
{
var repo = new DvdRepositoryMock();
string title = "A new movie";
int releaseYear = 2000;
string directorName = "John";
string ratingName = "G";
string notes = "A note";
repo.SaveNew(title, releaseYear, directorName, ratingName, notes);
var test = repo.GetAllDvd();
Assert.AreEqual(3, test.Count());
}