code: def test_single_functional_node_base_case(serve_instance):
      # Base case should work
      handle = serve.run(func.bind())
      assert handle.remote().result() == 1
      assert requests.get("http://127.0.0.1:8000/").text == "1"
  
imports: import array
  import asyncio
  import os
  import sys
  from typing import Dict, Union
  import pytest
  import requests
  import starlette.requests
  from ray import serve
  from ray.serve._private.deployment_graph_build import build
  from ray.serve.handle import DeploymentHandle
label_desc: Use image node_id 16 for calling a global function with example usage: test_single_functional_node_base_case(serve_instance) without return types