public void RemovePlaylistTest()
        {
            // Arrange
            MusicPlayer     player   = new MusicPlayer();
            Playlist        playlist = new Playlist("Test");
            List <Playlist> expected = new List <Playlist>();

            player.Add(playlist);

            // Act
            player.Remove(playlist);

            // Assert

            CollectionAssert.AreEqual(expected, player.Playlists);
        }
        public void AddArtistTest()
        {
            // Arrange
            DateTime      birthday = new DateTime(2020, 12, 9);
            Artist        hans     = new Artist("Hans", birthday);
            MusicPlayer   player   = new MusicPlayer();
            List <Artist> expected = new List <Artist>();

            expected.Add(hans);

            // Act
            player.Add(hans);

            // Assert

            CollectionAssert.AreEqual(expected, player.Artists);
        }
        public void RemoveSongTest()
        {
            // Arrange
            MusicPlayer player   = new MusicPlayer();
            DateTime    birthday = new DateTime(2020, 12, 9);
            Artist      hans     = new Artist("Hans", birthday);
            string      path     = @"C:\Users\joeyo\OneDrive\Music";
            Song        song     = new Song("Test", 2020, hans, path);
            List <Song> expected = new List <Song>();

            player.Add(song);

            // Act
            player.Remove(song);

            // Assert

            CollectionAssert.AreEqual(expected, player.Songs);
        }