code: def tearDownClass(cls):
      pass
  
file_path: evadb/test/app_tests/test_youtube_channel_qa.py
imports: import os
  import subprocess
  import unittest
  from pathlib import Path
  from test.util import get_evadb_for_testing, shutdown_ray
label_desc: Use image node_id 2 for calling the YoutubeChannelQATest obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types