code: def test_dict_getitemstring(self):
      getitemstring = _testcapi.dict_getitemstring
      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)
  
      with support.catch_unraisable_exception() as cm:
          self.assertIs(getitemstring({}, INVALID_UTF8), KeyError)
          self.assertEqual(cm.unraisable.exc_type, UnicodeDecodeError)
          self.assertRegex(
              str(cm.unraisable.exc_value), "'utf-8' codec can't decode"
          )
  
      self.assertIs(getitemstring(42, b"a"), KeyError)
      self.assertIs(getitemstring([], b"a"), KeyError)
  
imports: import unittest
  from collections import OrderedDict, UserDict
  from types import MappingProxyType
  from test import support
  import _testcapi
label_desc: Use image node_id 9 for calling the CAPITest obj's underlying member method code with example usage: obj.test_dict_getitemstring() without return types