public void GetSongsByArtist()
{
const string artist = "artist";
ObservableCollection<Song> expectedSongs = new ObservableCollection<Song>();
SongRepository.Setup(r => r.GetByArtist(artist)).Returns(expectedSongs);
MusicService service = new MusicService(SongRepository.Object, MediaFileRepository.Object);
IList<Song> findMusics = service.GetByArtist(artist);
SongRepository.Verify(r => r.GetByArtist(artist), Times.Once());
Assert.AreEqual(expectedSongs, findMusics);
}
