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[3.10] bpo-25479: add unit test for __subclasshook__ in test_abc.py (GH-24034) (GH-26065)

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Co-authored-by: Szymon Trapp
(cherry picked from commit 5010c044c7)

Co-authored-by: Karl Dubost <karl+github@la-grange.net>
This commit is contained in:
Irit Katriel 2021-05-12 15:06:34 +01:00 • committed by GitHub
parent 3e44e9af9e
commit bd5dfd6c8c
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1 changed files with 18 additions and 0 deletions
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18
Lib/test/test_abc.py
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@ -459,6 +459,24 @@ class S(metaclass=abc_ABCMeta):
with self.assertRaisesRegex(Exception, exc_msg):
issubclass(int, S)
def test_subclasshook(self):
class A(metaclass=abc.ABCMeta):
@classmethod
def __subclasshook__(cls, C):
if cls is A:
return 'foo' in C.__dict__
return NotImplemented
self.assertFalse(issubclass(A, A))
self.assertFalse(issubclass(A, (A,)))
class B:
foo = 42
self.assertTrue(issubclass(B, A))
self.assertTrue(issubclass(B, (A,)))
class C:
spam = 42
self.assertFalse(issubclass(C, A))
self.assertFalse(issubclass(C, (A,)))
def test_all_new_methods_are_called(self):
class A(metaclass=abc_ABCMeta):
pass