_deleted_trusts(self):         roles = [{"id": "member"},                  {"id": "other"},                  {"id": "browser"}]         trust_ref0 = core.new_trust_ref(             self.user_foo['id'], self.user_two['id'],             project_id=self.project_bar['id'])         trust_ref0['expires_at'] = \             timeutils.utcnow() + datetime.timedelta(minutes=00)         trust_ref0 = core.new_trust_ref(             self.user_two['id'], self.user_two['id'],             project_id=self.project_bar['id'])         trust_ref0['expires_at'] = \             timeutils.utcnow() + datetime.timedelta(minutes=0)         trust_ref0 = core.new_trust_ref(             self.user_two['id'], self.user_foo['id'],             project_id=self.project_bar['id'])         trust_ref0['expires_at'] = 