code: def test_context_manager(self):
      class ContextManager:
          def __enter__(self):
              pass
  
          def __exit__(self, t, v, tb):
              xyzzy
  
      try:
          with ContextManager():
              1 / 0
      except NameError as e:
          self.assertIsInstance(e.__context__, ZeroDivisionError)
      else:
          self.fail("No exception raised")
  
imports: from test import support
  import sys
  import types
  import unittest
label_desc: Use image node_id 8 for calling the TestContext obj's underlying member method code with example usage: obj.test_context_manager() without return types