public void AllArtistsShouldActuallyReturnAllArtists()
{
var artistsRepository = new Mock <IRepository <Artist> >();
artistsRepository.Setup(r => r.All()).Returns(new List <Artist>()
{
new Artist(),
new Artist(),
new Artist()
}.AsQueryable());
var service = new HomeService(null, artistsRepository.Object, null);
Assert.Equal(3, service.AllArtists().Count());
}