code: def _test_dict_attribute(self, cls):
      obj = cls()
      obj.x = 5
      self.assertEqual(obj.__dict__, {"x": 5})
      with self.assertRaises(AttributeError):
          obj.__dict__ = {}
      with self.assertRaises(AttributeError):
          del obj.__dict__
  
imports: import sys
  import unittest
  from doctest import DocTestSuite
  from test import support
  from test.support import threading_helper
  from test.support.import_helper import import_module
  import weakref
  import _thread
  import threading
  import _threading_local
label_desc: Use image node_id 9 for calling the BaseLocalTest obj's underlying member method code with example usage: obj._test_dict_attribute(cls) without return types