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Update test_isinstance.py to 3.14.4 #7806

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Merged
youknowone merged 1 commit into from
May 9, 2026
+15 −6
Merged

Update test_isinstance.py to 3.14.4 #7806

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21 changes: 15 additions & 6 deletions Lib/test/test_isinstance.py
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Original file line number Diff line number Diff line change
Expand Up @@ -263,17 +263,19 @@ def test_subclass_tuple(self):
self.assertEqual(True, issubclass(int, (int, (float, int))))
self.assertEqual(True, issubclass(str, (str, (Child, str))))

@support.skip_wasi_stack_overflow()
@support.skip_emscripten_stack_overflow()
def test_subclass_recursion_limit(self):
# make sure that issubclass raises RecursionError before the C stack is
# blown
with support.infinite_recursion():
self.assertRaises(RecursionError, blowstack, issubclass, str, str)
self.assertRaises(RecursionError, blowstack, issubclass, str, str)

@support.skip_wasi_stack_overflow()
@support.skip_emscripten_stack_overflow()
def test_isinstance_recursion_limit(self):
# make sure that issubclass raises RecursionError before the C stack is
# blown
with support.infinite_recursion():
self.assertRaises(RecursionError, blowstack, isinstance, '', str)
self.assertRaises(RecursionError, blowstack, isinstance, '', str)

def test_subclass_with_union(self):
self.assertTrue(issubclass(int, int | float | int))
Expand Down Expand Up @@ -315,6 +317,9 @@ def __bases__(self):
self.assertRaises(RecursionError, issubclass, int, X())
self.assertRaises(RecursionError, isinstance, 1, X())

@support.skip_if_unlimited_stack_size
@support.skip_emscripten_stack_overflow()
@support.skip_wasi_stack_overflow()
def test_infinite_recursion_via_bases_tuple(self):
"""Regression test for bpo-30570."""
class Failure(object):
Expand All @@ -324,6 +329,9 @@ def __getattr__(self, attr):
with self.assertRaises(RecursionError):
issubclass(Failure(), int)

@support.skip_if_unlimited_stack_size
@support.skip_emscripten_stack_overflow()
@support.skip_wasi_stack_overflow()
def test_infinite_cycle_in_bases(self):
"""Regression test for bpo-30570."""
class X:
Expand Down Expand Up @@ -352,8 +360,9 @@ def blowstack(fxn, arg, compare_to):
# Make sure that calling isinstance with a deeply nested tuple for its
# argument will raise RecursionError eventually.
tuple_arg = (compare_to,)
for cnt in range(support.exceeds_recursion_limit()):
tuple_arg = (tuple_arg,)
while True:
for _ in range(100):
tuple_arg = (tuple_arg,)
fxn(arg, tuple_arg)


Expand Down
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