def test_iadd(self, evt):
        rval = event.ReturnValue(append_events=[evt])
        rval2 = event.ReturnValue(eat=True, append_events=[evt])
        rset = event.ResultSet()

        rset += rval
        rset += rval2
        rset += None
        assert rset.eat
        assert rset.append_events == [evt, evt]
def test_validate_question_suggestion_count_fails_for_negative_count(self):
        community_contribution_stats = (
            suggestion_services.get_community_contribution_stats()
        )
        community_contribution_stats.question_suggestion_count = (
            self.negative_count
        )

        with self.assertRaisesRegex(
            utils.ValidationError,
            'Expected the question suggestion count to be non-negative, '
            'received: %s.' % (
                community_contribution_stats.question_suggestion_count)
        ):
            community_contribution_stats.validate()