8000 [3.9] bpo-25479: add unit test for __subclasshook__ in test_abc.py (GH-24034) by miss-islington · Pull Request #26063 · python/cpython · GitHub
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[3.9] bpo-25479: add unit test for __subclasshook__ in test_abc.py (GH-24034) #26063

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Merged
merged 1 commit into from
May 12, 2021
Merged

[3.9] bpo-25479: add unit test for __subclasshook__ in test_abc.py (GH-24034) #26063

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18 changes: 18 additions & 0 deletions Lib/test/test_abc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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
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