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[3.13] gh-118899: Add tests for `NotImplemented` attribute access (GH-118902) by miss-islington · Pull Request #118968 · python/cpython · GitHub
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[3.13] gh-118899: Add tests for NotImplemented attribute access (GH-118902) #118968

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Merged
sobolevn merged 1 commit into from
May 12, 2024
Merged

[3.13] gh-118899: Add tests for NotImplemented attribute access (GH-118902) #118968

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gh-118899: Add tests for NotImplemented attribute access (GH-118902) 
(cherry picked from commit ec1398e)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>
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@sobolevn @miss-islington
sobolevn authored and miss-islington committed May 12, 2024
commit bccb0fad65bde4baa2ddbf25bbafdc174d60359d
18 changes: 18 additions & 0 deletions Lib/test/test_builtin.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2139,6 +2139,24 @@ 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):
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