public async Task DeleteMusicPlaylistAsyncShouldDeleteMusicPlaylist()
        {
            var newMusicPlaylist = new MusicPlaylist();

            _musicBLMock.Setup(x => x.DeleteMusicPlaylistAsync(It.IsAny <MusicPlaylist>())).Returns(Task.FromResult <MusicPlaylist>(newMusicPlaylist));
            var newMusicBL = new UploadedMusicBL(_musicBLMock.Object);
            var result     = await newMusicBL.DeleteMusicPlaylistAsync(newMusicPlaylist);

            Assert.Equal(result, newMusicPlaylist);
            _musicBLMock.Verify(x => x.DeleteMusicPlaylistAsync(It.IsAny <MusicPlaylist>()));
        }