code: def test_handle_options_custom_router(
      serve_instance, use_new_handle_api: bool
  ):
      @serve.deployment
      def echo(name: str):
          return f"Hi {name}"
  
      handle = serve.run(echo.bind()).options(
          _router_cls="ray.serve.tests.test_handle.MyRouter",
          use_new_handle_api=use_new_handle_api,
      )
  
      if use_new_handle_api:
          result = handle.remote("HI").result()
      else:
          result = ray.get(handle.remote("HI"))
  
      assert result == "Hi HI"
  
      print("Router class used", handle._router._replica_scheduler)
      assert (
          "MyRouter"
          in handle._router._replica_scheduler.__class__.__name__
      ), handle._router._replica_scheduler
  
imports: import asyncio
  import concurrent.futures
  import threading
  import pytest
  import requests
  import ray
  from ray import serve
  from ray.serve._private.common import RequestProtocol
  from ray.serve._private.constants import SERVE_DEFAULT_APP_NAME
  from ray.serve._private.router import PowerOfTwoChoicesReplicaScheduler
  from ray.serve.exceptions import RayServeException
  from ray.serve.handle import DeploymentHandle, _HandleOptions
label_desc: Use image node_id 15 for calling a global function with example usage: test_handle_options_custom_router(serve_instance, use_new_handle_api) and returns: str, name