public static ConfigResponse fromJson(String json) {
    return JsonUtil.parse(json, ConfigResponseParser::fromJson);
  }
@Test
  public void unknownFields() {
    ConfigResponse actual = ConfigResponseParser.fromJson("{\"x\": \"val\", \"y\": \"val2\"}");
    ConfigResponse expected = ConfigResponse.builder().build();
    // ConfigResponse doesn't implement hashCode/equals
    assertThat(actual.defaults()).isEqualTo(expected.defaults()).isEmpty();
    assertThat(actual.overrides()).isEqualTo(expected.overrides()).isEmpty();
  }