code: def test_refresh_controller_after_death(shutdown_ray_and_serve):
      """Check if serve.start() refreshes the controller handle if it's dead."""
  
      ray.init(namespace="ray_namespace")
      serve.shutdown()  # Ensure serve isn't running before beginning the test
      serve.start()
  
      old_handle = _get_global_client()._controller
      ray.kill(old_handle, no_restart=True)
  
      def controller_died(handle):
          try:
              ray.get(handle.check_alive.remote())
              return False
          except RayActorError:
              return True
  
      wait_for_condition(controller_died, handle=old_handle, timeout=15)
  
      # Call start again to refresh handle
      serve.start()
  
      new_handle = _get_global_client()._controller
      assert new_handle is not old_handle
  
      # Health check should not error
      ray.get(new_handle.check_alive.remote())
  
imports: import os
  import subprocess
  import sys
  from contextlib import contextmanager
  from tempfile import NamedTemporaryFile
  import pytest
  import requests
  import ray
  import ray._private.state
  import ray.actor
  from ray import serve
  from ray._private.test_utils import wait_for_condition
  from ray.exceptions import RayActorError
  from ray.serve._private.constants import SERVE_DEFAULT_APP_NAME, SERVE_NAMESPACE
  from ray.serve.context import _get_global_client
  from ray.tests.conftest import call_ray_stop_only
  from ray.util.state import list_actors
label_desc: Use image node_id 9 for calling a global function with example usage: test_refresh_controller_after_death(shutdown_ray_and_serve) and returns: False, True