* @see MusicLibrary#ratingOf(Song)
* @see CloudScrobblingMusicLibrary.CloudScrobblingService#retrieveScrobbledRatingOf(Song)
*/
@Test
public void overridesDefaultMethodInClassToProvideCustomSongRatingAlgorithm() {
MusicLibrary library = new CloudScrobblingMusicLibrary();
assertThat(library.ratingOf(new Song("Candy", "Paulo Nutini")), is(new Rating(78)));
assertThat(CloudScrobblingMusicLibrary.class, HasConcreteMethod.called("ratingOf"));
}