code: def test_monai_env_vars(self):
      for debug in (False, True):
          os.environ["MONAI_DEBUG"] = str(debug)
          self.assertEqual(os.environ.get("MONAI_DEBUG"), str(debug))
          self.assertEqual(MONAIEnvVars.debug(), debug)
  
file_path: MONAI/tests/test_monai_env_vars.py
imports: from __future__ import annotations
  import os
  import unittest
  from monai.utils.misc import MONAIEnvVars
label_desc: Use image node_id 3 for calling the TestMONAIEnvVars obj's underlying member method code with example usage: obj.test_monai_env_vars() without return types