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gh-118899: Add tests for NotImplemented attribute access #118902

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May 12, 2024
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16 changes: 16 additions & 0 deletions Lib/test/test_builtin.py
Original file line number Diff line number Diff line change
Expand Up @@ -2138,6 +2138,22 @@ def test_bool_notimplemented(self):
with self.assertRaisesRegex(TypeError, msg):
not NotImplemented

def test_not_implemented(self):
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self.assertIs(type(NotImplemented), NotImplemented.__class__)
self.assertIs(type(NotImplemented).__class__, type)

# Missing instance attributes:
with self.assertRaises(AttributeError):
NotImplemented.prop
with self.assertRaises(AttributeError):
NotImplemented.prop = 1

# Missing class attributes:
with self.assertRaises(AttributeError):
type(NotImplemented).prop
with self.assertRaises(TypeError):
type(NotImplemented).prop = 1


class TestBreakpoint(unittest.TestCase):
def setUp(self):
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