.addEqualityGroup(Functions.forMap(map, 43))
        .testEquals();
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testForMapWithDefault_includeSerializable() {
    Map<String, Integer> map = new HashMap<>();
    map.put("One", 1);
    map.put("Three", 3);
    Function<String, Integer> function = Functions.forMap(map, 42);