.addEqualityGroup(Functions.forMap(map, 1))
        .testEquals();
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testForMapWithDefault_null_compareWithSerializable() {
    ImmutableMap<String, Integer> map = ImmutableMap.of("One", 1);
    Function<String, Integer> function = Functions.forMap(map, null);

    assertEquals((Integer) 1, function.apply("One"));