public async Task Test_AuthAddTracksToPlaylist() { var result = await _client.AuthAddTracksToPlaylistAsync( "7D4Epnvxhc8l6NpooJqYXk", new UriListRequest() { Uris = new List <string> { "spotify:track:2zzdnRWE3z6QP3FoVlnWHO" } }, 0); Assert.IsTrue(result.Success); }