code: def client():
      with TestClient(app) as client:
          yield client
  
file_path: litellm/litellm/tests/test_proxy_server_langfuse.py
imports: import sys, os
  import traceback
  from dotenv import load_dotenv
  import os, io
  import pytest, logging
  import litellm
  from litellm import embedding, completion, completion_cost, Timeout
  from litellm import RateLimitError
  from fastapi.testclient import TestClient
  from fastapi import FastAPI
  from litellm.proxy.proxy_server import router, save_worker_config, startup_event
label_desc: Use image node_id 1 for calling a global function with example usage: client() without return types