code: def test_handle_method_name_validation(serve_instance):
      @serve.deployment
      class A:
          def b(self, *args):
              return "hello"
  
      handle = serve.run(A.bind(), name="app")
  
      # Specify method via `.options`.
      assert (
          handle.options(method_name="b").remote().result() == "hello"
      )
  
      # Specify method via attribute.
      assert handle.b.remote().result() == "hello"
  
      # Unknown method.
      with pytest.raises(RayServeException):
          handle.options(method_name="c").remote().result()
  
      with pytest.raises(RayServeException):
          handle.c.remote().result()
  
imports: import os
  import sys
  import time
  from collections import defaultdict
  from typing import Callable
  import pytest
  import requests
  import ray
  from ray import serve
  from ray._private.pydantic_compat import ValidationError
  from ray._private.test_utils import SignalActor
  from ray.serve._private.utils import get_random_string
  from ray.serve.exceptions import RayServeException
label_desc: Use image node_id 10 for calling a global function with example usage: test_handle_method_name_validation(serve_instance) and returns: str