diff --git a/Lib/test/test_funcattrs.py b/Lib/test/test_funcattrs.py index d919d62613ea7c..375f456dfde834 100644 --- a/Lib/test/test_funcattrs.py +++ b/Lib/test/test_funcattrs.py @@ -3,6 +3,7 @@ import typing import unittest import warnings +from test import support def global_function(): @@ -478,6 +479,33 @@ def test_builtin__qualname__(self): self.assertEqual([1, 2, 3].append.__qualname__, 'list.append') self.assertEqual({'foo': 'bar'}.pop.__qualname__, 'dict.pop') + @support.cpython_only + def test_builtin__self__(self): + # See https://github.com/python/cpython/issues/58211. + import builtins + import time + + # builtin function: + self.assertIs(len.__self__, builtins) + self.assertIs(time.sleep.__self__, time) + + # builtin classmethod: + self.assertIs(dict.fromkeys.__self__, dict) + self.assertIs(float.__getformat__.__self__, float) + + # builtin staticmethod: + self.assertIsNone(str.maketrans.__self__) + self.assertIsNone(bytes.maketrans.__self__) + + # builtin bound instance method: + l = [1, 2, 3] + self.assertIs(l.append.__self__, l) + + d = {'foo': 'bar'} + self.assertEqual(d.pop.__self__, d) + + self.assertIsNone(None.__repr__.__self__) + if __name__ == "__main__": unittest.main()