code: def test_connection(self):
      with ray_start_client_server():
          assert ray.util.client.ray.is_connected()
      assert ray.util.client.ray.is_connected() is False
  
file_path: ray/python/ray/rllib/tests/test_ray_client.py
imports: import os
  import sys
  import unittest
  import pytest
  import ray
  from ray import air
  from ray import tune
  import ray.rllib.algorithms.ppo
  from ray.rllib.examples.env.stateless_cartpole import StatelessCartPole
  from ray.util.client.ray_client_helpers import ray_start_client_server
label_desc: Use image node_id 1 for calling the TestRayClient obj's underlying member method code with example usage: obj.test_connection() without return types