code: def test_user_config_empty(serve_instance):
      @serve.deployment(user_config={})
      class Counter:
          def __init__(self):
              self.count = 0
  
          def __call__(self, *args):
              return self.count
  
          def reconfigure(self, config):
              self.count += 1
  
      handle = serve.run(Counter.bind()).options(
          use_new_handle_api=True,
      )
      assert handle.remote().result() == 1
  
imports: import asyncio
  import os
  import sys
  from typing import Dict, Optional
  import pytest
  import requests
  import starlette.responses
  from fastapi import FastAPI
  import ray
  from ray import serve
  from ray._private.pydantic_compat import BaseModel, ValidationError
  from ray._private.test_utils import SignalActor, wait_for_condition
  from ray.serve._private.api import call_app_builder_with_args_if_necessary
  from ray.serve._private.common import DeploymentID
  from ray.serve._private.constants import SERVE_DEFAULT_APP_NAME
  from ray.serve.deployment import Application
  from ray.serve.exceptions import RayServeException
  from ray.serve.handle import DeploymentHandle, RayServeHandle
label_desc: Use image node_id 14 for calling a global function with example usage: test_user_config_empty(serve_instance) and returns: self