def test_modify_missing_cnum(self):
        self.env.db_transaction(
            "UPDATE ticket_change SET oldvalue='' WHERE oldvalue='3'")
        ticket = Ticket(self.env, self.id)
        t = self.created + timedelta(seconds=30)
        ticket.modify_comment(self._find_change(ticket, 3),
                              'joe', 'New comment 3', t)
        self.assertChange(ticket, 3, self.t3, 'jim',
            keywords=dict(author='jim', old='a, b, c', new='a, b'),
            comment=dict(author='jim', old='', new='New comment 3'),
            _comment0=dict(author='joe', old='Comment 3',
                           new=str(to_utimestamp(t))))
suspend the specified instance.
dataset/ETHPy150Open edgewall/trac/trac/ticket/tests/model.py/TicketCommentEditTestCase.test_modify_missing_cnum--crossover with--dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/virt/xenapi/driver.py/XenAPIDriver.suspend