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gh-137463: Update validate_abstract_methods in test_collections.py (#137464)

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Update `validate_abstract_methods` in `test_collections.py`

The test for missing abstract methods in `validate_abstract_methods` incorrectly attempted to instantiate the generated class `C` with an argument (`C(name)`), which always raises a `TypeError: C() takes no arguments`. Although the test originally passes, it passes for the wrong reason.

This change makes the test correctly validate the enforcement of abstract methods in ABCs.
This commit is contained in:
Guilherme Leobas 2025-08-07 03:10:56 -03:00 • committed by GitHub
parent 3c1471d971
commit 5be872350d
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1 changed files with 8 additions and 10 deletions
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18
Lib/test/test_collections.py
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@ -736,7 +736,7 @@ class ABCTestCase(unittest.TestCase):
stubs = methodstubs.copy()
del stubs[name]
C = type('C', (abc,), stubs)
self.assertRaises(TypeError, C, name)
self.assertRaises(TypeError, C)
def validate_isinstance(self, abc, name):
stub = lambda s, *args: 0
@ -963,7 +963,7 @@ class TestOneTrickPonyABCs(ABCTestCase):
async def __anext__(self):
raise StopAsyncIteration
self.assertNotIsInstance(AnextOnly(), AsyncIterator)
self.validate_abstract_methods(AsyncIterator, '__anext__', '__aiter__')
self.validate_abstract_methods(AsyncIterator, '__anext__')
def test_Iterable(self):
# Check some non-iterables
@ -1159,7 +1159,7 @@ class TestOneTrickPonyABCs(ABCTestCase):
for x in samples:
self.assertIsInstance(x, Iterator)
self.assertIsSubclass(type(x), Iterator)
self.validate_abstract_methods(Iterator, '__next__', '__iter__')
self.validate_abstract_methods(Iterator, '__next__')
# Issue 10565
class NextOnly:
@ -1843,8 +1843,7 @@ class TestCollectionABCs(ABCTestCase):
for sample in [dict]:
self.assertIsInstance(sample(), Mapping)
self.assertIsSubclass(sample, Mapping)
self.validate_abstract_methods(Mapping, '__contains__', '__iter__', '__len__',
'__getitem__')
self.validate_abstract_methods(Mapping, '__iter__', '__len__', '__getitem__')
class MyMapping(Mapping):
def __len__(self):
return 0
@ -1859,7 +1858,7 @@ class TestCollectionABCs(ABCTestCase):
for sample in [dict]:
self.assertIsInstance(sample(), MutableMapping)
self.assertIsSubclass(sample, MutableMapping)
self.validate_abstract_methods(MutableMapping, '__contains__', '__iter__', '__len__',
self.validate_abstract_methods(MutableMapping, '__iter__', '__len__',
'__getitem__', '__setitem__', '__delitem__')
def test_MutableMapping_subclass(self):
@ -1898,8 +1897,7 @@ class TestCollectionABCs(ABCTestCase):
self.assertIsInstance(memoryview(b""), Sequence)
self.assertIsSubclass(memoryview, Sequence)
self.assertIsSubclass(str, Sequence)
self.validate_abstract_methods(Sequence, '__contains__', '__iter__', '__len__',
'__getitem__')
self.validate_abstract_methods(Sequence, '__len__', '__getitem__')
def test_Sequence_mixins(self):
class SequenceSubclass(Sequence):
@ -1954,8 +1952,8 @@ class TestCollectionABCs(ABCTestCase):
self.assertIsSubclass(sample, MutableSequence)
self.assertIsSubclass(array.array, MutableSequence)
self.assertNotIsSubclass(str, MutableSequence)
self.validate_abstract_methods(MutableSequence, '__contains__', '__iter__',
'__len__', '__getitem__', '__setitem__', '__delitem__', 'insert')
self.validate_abstract_methods(MutableSequence, '__len__', '__getitem__',
'__setitem__', '__delitem__', 'insert')
def test_MutableSequence_mixins(self):
# Test the mixins of MutableSequence by creating a minimal concrete