Question2 { public static int countBandMembersInternal(List<Artist> artists) { return Exercises.replaceThisWithSolution(); }  static int countBandMembersInternal(List<Artist> artists);  }
@Test public void internal() { assertEquals(4, countBandMembersInternal(Arrays.asList(SampleData.johnColtrane, SampleData.theBeatles))); }