From 76dc1bf5be3b360f7d8c476accb0d8d53c8dfb08 Mon Sep 17 00:00:00 2001 From: "Miss Islington (bot)" <31488909+miss-islington@users.noreply.github.com> Date: Sun, 12 May 2024 16:22:58 +0200 Subject: [PATCH] [3.12] gh-118899: Add tests for `NotImplemented` attribute access (GH-118902) (#118969) gh-118899: Add tests for `NotImplemented` attribute access (GH-118902) (cherry picked from commit ec1398e117fb142cc830495503dbdbb1ddafe941) Co-authored-by: Nikita Sobolev --- Lib/test/test_builtin.py | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py index 211dd89ea48..c71c56877f6 100644 --- a/Lib/test/test_builtin.py +++ b/Lib/test/test_builtin.py @@ -2091,6 +2091,24 @@ class BuiltinTest(unittest.TestCase): with self.assertWarns(DeprecationWarning): self.assertFalse(not NotImplemented) + def test_singleton_attribute_access(self): + for singleton in (NotImplemented, Ellipsis): + with self.subTest(singleton): + self.assertIs(type(singleton), singleton.__class__) + self.assertIs(type(singleton).__class__, type) + + # Missing instance attributes: + with self.assertRaises(AttributeError): + singleton.prop = 1 + with self.assertRaises(AttributeError): + singleton.prop + + # Missing class attributes: + with self.assertRaises(TypeError): + type(singleton).prop = 1 + with self.assertRaises(AttributeError): + type(singleton).prop + class TestBreakpoint(unittest.TestCase): def setUp(self):