assertThat(res.isValid(), equalTo(false));
List<Error> errors = res.getErrors();
assertThat(errors.size(), equalTo(1));
Error e0 = errors.get(0);
assertThat(e0.getName(), equalTo("f"));
assertThat(e0.getMessage(), equalTo("a"));
assertThat(res.getRedirectUrl(), nullValue());
}