def setUpClass(cls):
        super(QuotasAdminNegativeTestJSON, cls).setUpClass()
        cls.client = cls.os.quotas_client
        cls.adm_client = cls.os_adm.quotas_client
        cls.sg_client = cls.security_groups_client

        # NOTE(afazekas): these test cases should always create and use a new
        # tenant most of them should be skipped if we can't do that
        cls.demo_tenant_id = cls.client.tenant_id