@Test public void countsRunningTime() { assertEquals(909, order.countRunningTime()); }
public abstract long countRunningTime();
Order { public abstract long countRunningTime(); }
Order { public abstract long countRunningTime(); Order(List<Album> albums); }
Order { public abstract long countRunningTime(); Order(List<Album> albums); abstract long countRunningTime(); abstract long countMusicians(); abstract long countTracks(); }
Order { public abstract long countRunningTime(); Order(List<Album> albums); abstract long countRunningTime(); abstract long countMusicians(); abstract long countTracks();  }