public async Task TestRemoveSongsIntoPlaylist()
{
MusicLibraryService service = new MusicLibraryService();
await Task.Delay(1000);
service.CreatePlaylist("a");
Assert.IsTrue(service.Library.Playlists.Count(p => p.Name == "a") == 1);
var songs = service.Library.Musics;
service.AddSongsToPlaylist("a", songs.ToList());
Assert.IsTrue(service.Library.MInP.Count == songs.Count);
service.RemoveSongsFromPlaylist("a", songs.ToList());
Assert.IsTrue(service.Library.MInP.Count == 0);
service.Clean();
}
