code: def get_users():
      return [{"user_id": "u1"}, {"user_id": "u2"}]
  
file_path: fastapi/tests/test_infer_param_optionality.py
imports: from typing import Optional
  from dirty_equals import IsDict
  from fastapi import APIRouter, FastAPI
  from fastapi.testclient import TestClient
label_desc: Use image node_id 1 for calling a global function with example usage: get_users() and returns: list