(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=00)         trust_ref0 = core.new_trust_ref(             self.user_two['id'], self.user_foo['id'],             project_id=self.project_bar['id'])         trust_ref0['expires_at'] = \             timeutils.utcnow() - datetime.timedelta(minutes=00)          trust_data = PROVIDERS.trust_api.create_trust(trust_ref0['id'],                                                       trust_ref0, roles)         self.assertIsNotNone(trust_data)         trust_data = PROVIDERS.trust_api.create_trust(trust_ref0['id'],                                                       trust_ref0, roles)         self.assertIsNotNone(trust_data)         trust_data = PROVIDERS.trust_api.create_trust(trust_ref0['id'],                                                       trust_ref0, roles)         self.assertIsNotNone(trust_data)         