assertFalse(multimap.asMap() instanceof SortedMap);
  }

  public void testNewMultimapValueCollectionMatchesNavigableSet() {
    Supplier<TreeSet<Integer>> factory = new SortedSetSupplier();
    Map<Color, Collection<Integer>> map = Maps.newEnumMap(Color.class);
    Multimap<Color, Integer> multimap = Multimaps.newMultimap(map, factory);
    assertTrue(multimap.get(Color.BLUE) instanceof NavigableSet);