code: def test_multiple_clients_use_different_drivers(call_ray_start):
      """
      Test that each client uses a separate JobIDs and namespaces.
      """
      with ray.client("localhost:25001").connect():
          job_id_one = ray.get_runtime_context().job_id
          namespace_one = ray.get_runtime_context().namespace
      with ray.client("localhost:25001").connect():
          job_id_two = ray.get_runtime_context().job_id
          namespace_two = ray.get_runtime_context().namespace
  
      assert job_id_one != job_id_two
      assert namespace_one != namespace_two
  
imports: import json
  import os
  import random
  import sys
  import time
  from glob import glob
  from unittest.mock import patch, MagicMock
  from itertools import chain
  import grpc
  import pytest
  import ray
  import ray.core.generated.ray_client_pb2
  import ray.util.client.server.proxier
  from ray._private.ray_constants import REDIS_DEFAULT_PASSWORD
  from ray._private.test_utils import run_string_as_driver, wait_for_condition
  from ray.cloudpickle.compat import pickle
  from ray.job_config import JobConfig
label_desc: Use image node_id 4 for calling a global function with example usage: test_multiple_clients_use_different_drivers(call_ray_start) without return types