code: def tearDown(self):
      if Path("./tests/temporary_test_data").exists():
          shutil.rmtree("./tests/temporary_test_data")
      if Path("./log_file").exists():
          Path("./log_file").unlink()
      pass
  
imports: import unittest
  import shutil
  import yaml
  from pathlib import Path
  from unittest.mock import patch
  from ISR.utils.train_helper import TrainerHelper
  from ISR.models.rrdn import RRDN
  from ISR.models.discriminator import Discriminator
  from ISR.models.cut_vgg19 import Cut_VGG19
label_desc: Use image node_id 4 for calling the UtilsClassTest obj's underlying member method code with example usage: obj.tearDown() without return types