return new SetMultimapBuilder<K0, @Nullable Object>() {
        @Override
        public <K extends K0, V extends @Nullable Object> SetMultimap<K, V> build() {
          return Multimaps.newSetMultimap(
              MultimapBuilderWithKeys.this.<K, V>createMap(),
              new HashSetSupplier<V>(expectedValuesPerKey));
        }
      };
    }

  public void testNewSetMultimap() {
    CountingSupplier<Set<Integer>> factory = new SetSupplier();
    Map<Color, Collection<Integer>> map = Maps.newHashMap();
    SetMultimap<Color, Integer> multimap = Multimaps.newSetMultimap(map, factory);
    assertEquals(0, factory.count);
    multimap.putAll(Color.BLUE, asList(3, 1, 4));
    assertEquals(1, factory.count);
    multimap.putAll(Color.RED, asList(2, 7, 1, 8));