code: def test_dict_methods(self):
      mock = Mock()
  
      self.assertRaises(TypeError, lambda: mock["foo"])
  
      def _del():
          del mock["foo"]
  
      def _set():
          mock["foo"] = 3
  
      self.assertRaises(TypeError, _del)
      self.assertRaises(TypeError, _set)
  
      _dict = {}
  
      def getitem(s, name):
          return _dict[name]
  
      def setitem(s, name, value):
          _dict[name] = value
  
      def delitem(s, name):
          del _dict[name]
  
      mock.__setitem__ = setitem
      mock.__getitem__ = getitem
      mock.__delitem__ = delitem
  
      self.assertRaises(KeyError, lambda: mock["foo"])
      mock["foo"] = "bar"
      self.assertEqual(_dict, {"foo": "bar"})
      self.assertEqual(mock["foo"], "bar")
      del mock["foo"]
      self.assertEqual(_dict, {})
  
imports: import math
  import unittest
  import os
  from asyncio import iscoroutinefunction
  from unittest.mock import AsyncMock, Mock, MagicMock, _magics
label_desc: Use image node_id 7 for calling the TestMockingMagicMethods obj's underlying member method code with example usage: obj.test_dict_methods() and returns: _dict