code: def ensure_agent_ok(self) -> None:
      agent_data = get_agent_data(conf.make_master_url())
      assert len(agent_data) == 1
      assert agent_data[0]["enabled"] is True
      assert agent_data[0]["draining"] is False
  
imports: import json
  import os
  import subprocess
  import time
  from typing import Any, Dict, Iterator, List, Union, cast
  import pytest
  from tests import config
  from .abstract_cluster import Cluster
  from .test_users import logged_in_user
  from .utils import now_ts, set_master_port
label_desc: Use image node_id 11 for calling the ManagedCluster obj's underlying member method code with example usage: obj.ensure_agent_ok() without return types