@Override
  public void validate(String value, @Nullable List<String> options) {
    checkRequest(StringUtils.equalsIgnoreCase(value, "true") || StringUtils.equalsIgnoreCase(value, "false"),
      "Value '%s' must be one of \"true\" or \"false\".", value);
  }
@Test
  public void not_fail_on_valid_boolean() {
    underTest.validate("true", null);
    underTest.validate("True", null);
    underTest.validate("false", null);
    underTest.validate("FALSE", null);
  }