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[3.13] typing: Add missing test case for Protocol inheritance (GH-132597) (#132603)

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Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
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Miss Islington (bot) 2025-04-16 17:45:29 +02:00 • committed by GitHub
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17
Lib/test/test_typing.py
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@ -2935,6 +2935,23 @@ class ProtocolTests(BaseTestCase):
self.assertNotIsInstance(D(), E)
self.assertNotIsInstance(E(), D)
def test_inheritance_from_object(self):
# Inheritance from object is specifically allowed, unlike other nominal classes
class P(Protocol, object):
x: int
self.assertEqual(typing.get_protocol_members(P), {'x'})
class OldGeneric(Protocol, Generic[T], object):
y: T
self.assertEqual(typing.get_protocol_members(OldGeneric), {'y'})
class NewGeneric[T](Protocol, object):
z: T
self.assertEqual(typing.get_protocol_members(NewGeneric), {'z'})
def test_no_instantiation(self):
class P(Protocol): pass