code: def client():
      client = BatchClient("test")
      yield client
      client.close()
  
imports: import asyncio
  import os
  import re
  import secrets
  import pytest
  from aiohttp import web
  from hailtop.batch_client import aioclient
  from hailtop.batch_client.client import BatchClient, Job
  from .utils import DOCKER_ROOT_IMAGE, batch_status_job_counter, create_batch, legacy_batch_status
label_desc: Use image node_id 1 for calling a global function with example usage: client() without return types