code: def tearDownClass(cls):
      if os.path.exists(cls.mock_imagenet_dir):
          shutil.rmtree(cls.mock_imagenet_dir)
      if os.path.exists(cls.mock_output_dir):
          shutil.rmtree(cls.mock_output_dir)
  
file_path: petastorm/examples/imagenet/tests/test_generate_imagenet_dataset.py
imports: import os
  import shutil
  import tempfile
  import unittest
  import cv2
  import numpy
  from examples.imagenet.generate_petastorm_imagenet import download_nouns_mapping, imagenet_directory_to_petastorm_dataset
label_desc: Use image node_id 2 for calling the TestGenerate obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types