### Question:
TuneService { public List<Tune> getByGenre(String genre) { Preconditions.checkNotNull(!Strings.isNullOrEmpty(genre), "Genre value is required for data retrieval"); log.debug("Get by genre {}", genre); return tunesRepository.getByGenre(genre); }  List<Tune> getByGenre(String genre); List<Tune> getByArtist(String artist); List<Tune> getAll(); void store(Tune tune); void remove(Tune tune);  }### Answer:
@Test public void getByGenre() { List<Tune> byGenre = tuneService.getByGenre("Other"); Assertions.assertThat(byGenre).hasSize(0); Mockito.verify(tunesRepository).getByGenre("Other"); }