def __str__(self):
        return "\n".join([str(x) for x in self])
def test_validate_author_id_format(self):
        expected_suggestion_dict = self.suggestion_dict
        suggestion = suggestion_registry.SuggestionAddQuestion(
            expected_suggestion_dict['suggestion_id'],
            expected_suggestion_dict['target_id'],
            expected_suggestion_dict['target_version_at_submission'],
            expected_suggestion_dict['status'], self.author_id,
            self.reviewer_id, expected_suggestion_dict['change'],
            expected_suggestion_dict['score_category'],
            expected_suggestion_dict['language_code'], False, self.fake_date)

        suggestion.validate()

        suggestion.author_id = ''
        with self.assertRaisesRegex(
            utils.ValidationError,
            'Expected author_id to be in a valid user ID format.'):
            suggestion.validate()