code: def get_client():
      from docs_src.bigger_applications.app_an_py39.main import app
  
      client = TestClient(app)
      return client
  
imports: import pytest
  from dirty_equals import IsDict
  from fastapi.testclient import TestClient
  from fastapi.utils import match_pydantic_error_url
  from ...utils import needs_py39
label_desc: Use image node_id 1 for calling a global function with example usage: get_client() and returns: client