def test_list_vms(self):
        with patch.object(xapi, "_get_xapi_session", MagicMock()):
            self.assertListEqual(xapi.list_domains(), [])
sets or changes a bucket's acl to a predefined (canned) value. 
dataset/ETHPy150Open saltstack/salt/tests/unit/modules/xapi_test.py/XapiTestCase.test_list_vms--crossover with--dataset/ETHPy150Open yyuu/botornado/boto/gs/bucket.py/Bucket.set_canned_acl