code: def successfulTest(self):
      self.assertEqual(
          os.path.realpath(self.tmp_dir), os.path.realpath(os.getcwd())
      )
      self.assertEqual(os.getenv("NEW_ENV"), "foo")
      self.assertEqual(os.getenv("OVERWRITE_ENV"), "baz")
  
imports: import copy
  import os
  import unittest
  import tensorflow
  from tfx import types
  from tfx.types import standard_artifacts
  from tfx.utils import test_case_utils
label_desc: Use image node_id 2 for calling the TempWorkingDirTest obj's underlying member method code with example usage: obj.successfulTest() without return types