@Override
    public Set<Integer> getImpl() {
      return new HashSet<>(4);
    }

    @GwtIncompatible @J2ktIncompatible private static final long serialVersionUID = 0;
  }

  public void testNewSetMultimap() {
    CountingSupplier<Set<Integer>> factory = new SetSupplier();
    Map<Color, Collection<Integer>> map = new HashMap<>();
    SetMultimap<Color, Integer> multimap = Multimaps.newSetMultimap(map, factory);