code: def tearDown(self):
      if self.orig_flag is not None:
          os.environ["MONAI_DEBUG"] = self.orig_flag
      else:
          os.environ.pop("MONAI_DEBUG")
  
file_path: MONAI/tests/test_monai_utils_misc.py
imports: from __future__ import annotations
  import os
  import unittest
  from parameterized import parameterized
  from monai.utils.misc import MONAIEnvVars, check_kwargs_exist_in_class_init, run_cmd, to_tuple_of_dictionaries
label_desc: Use image node_id 2 for calling the TestCommandRunner obj's underlying member method code with example usage: obj.tearDown() without return types