### Question:
ImmutableAlternatives implements Alternatives { @Override public boolean isEmpty() { return this.entries.isEmpty(); } private  ImmutableAlternatives(final ImmutableList<Entry> entries); @Override Iterator<Alternative> iterator(); @Override int size(); @Override boolean isEmpty(); @Override ImmutableAlternative alternative(int i); @Override ImmutableQuality quality(int i); @Override String toString();  }### Answer:
@Test public void emptyAlternativesIsEmpty() throws Exception { assertThat(empty().isEmpty(),equalTo(true)); }
@Test public void populatedAlternativesIsNotEmpty() throws Exception { assertThat(populated().isEmpty(),equalTo(false)); }