code: def event_loop(request):
      """
      Valid only for `pytest.mark.asyncio` tests
      """
      loop = asyncio.get_event_loop_policy().new_event_loop()
      yield loop
      loop.close()
  
file_path: jina/tests/conftest.py
imports: import asyncio
  import os
  import random
  import string
  import tempfile
  import time
  import pytest
  from jina import helper
label_desc: Use image node_id 10 for calling a global function with example usage: event_loop(request) without return types