code: def test_dict_getitemstringref(self):
      getitemstring = _testcapi.dict_getitemstringref
      dct = {"a": 1, "\U0001f40d": 2}
      self.assertEqual(getitemstring(dct, b"a"), 1)
      self.assertIs(getitemstring(dct, b"b"), KeyError)
      self.assertEqual(getitemstring(dct, "\U0001f40d".encode()), 2)
  
      dct2 = DictSubclass(dct)
      self.assertEqual(getitemstring(dct2, b"a"), 1)
      self.assertIs(getitemstring(dct2, b"b"), KeyError)
  
      self.assertRaises(SystemError, getitemstring, 42, b"a")
      self.assertRaises(
          UnicodeDecodeError, getitemstring, {}, INVALID_UTF8
      )
      self.assertRaises(SystemError, getitemstring, [], b"a")
  
imports: import unittest
  from collections import OrderedDict, UserDict
  from types import MappingProxyType
  from test import support
  import _testcapi
label_desc: Use image node_id 11 for calling the CAPITest obj's underlying member method code with example usage: obj.test_dict_getitemstringref() without return types