StandardCrimeModel implements CrimeModel { @Override public void setTitle(String title) { crime.setTitle(title); } StandardCrimeModel(Crime crime); @Override void setTitle(String title);  }
@Test public void setTitle_setsTheTitleInBackingCrime_whenCalled() { Crime crime = new Crime(); StandardCrimeModel model = new StandardCrimeModel(crime); model.setTitle("title"); assertThat(crime.getTitle(), is(equalTo("title"))); }