From 351358bd56c9be542eb91fb26510b790d9bf0702 Mon Sep 17 00:00:00 2001 From: Nikita Sobolev Date: Sun, 12 May 2024 17:00:49 +0300 Subject: [PATCH] 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 211dd89ea4851c..c71c56877f690f 100644 --- a/Lib/test/test_builtin.py +++ b/Lib/test/test_builtin.py @@ -2091,6 +2091,24 @@ def test_warning_notimplemented(self): 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): pFad - Phonifier reborn

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