All tests in test_bigmem.py are skipped if _testcapi is not available

Bug report

Bug description:

This line:

cpython/Lib/test/test_bigmem.py

Line 13 in a00464b

_testcapi = import_helper.import_module('_testcapi')

causes the entire test module to be skipped if _testcapi isn't available but, the only test requiring it is:

cpython/Lib/test/test_bigmem.py

Lines 1261 to 1279 in a00464b

    
           class ImmortalityTest(unittest.TestCase): 
        
               @bigmemtest(size=_2G, memuse=pointer_size * 9/8) 
        
               def test_stickiness(self, size): 
        
                   """Check that immortality is "sticky", so that 
        
                      once an object is immortal it remains so.""" 
        
                   if size < _2G: 
        
                       # Not enough memory to cause immortality on overflow 
        
                       return 
        
                   o1 = o2 = o3 = o4 = o5 = o6 = o7 = o8 = object() 
        
                   l = [o1] * (size-20) 
        
                   self.assertFalse(_testcapi.is_immortal(o1)) 
        
                   for _ in range(30): 
        
                       l.append(l[0]) 
        
                   self.assertTrue(_testcapi.is_immortal(o1)) 
        
                   del o2, o3, o4, o5, o6, o7, o8 
        
                   self.assertTrue(_testcapi.is_immortal(o1)) 
        
                   del l 
        
                   self.assertTrue(_testcapi.is_immortal(o1))

CPython versions tested on:

CPython main branch

Operating systems tested on:

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gh-152168: Don't skip `test_bigmem` if `_testcapi` is missing (#152171)

[3.15] gh-152168: Don't skip `test_bigmem` if `_testcapi` is missing (G…

[3.14] gh-152168: Don't skip `test_bigmem` if `_testcapi` is missing (G…

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All tests in `test_bigmem.py` are skipped if `_testcapi` is not available #152168

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CPython versions tested on:

Operating systems tested on:

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	class ImmortalityTest(unittest.TestCase):

	@bigmemtest(size=_2G, memuse=pointer_size * 9/8)
	def test_stickiness(self, size):
	"""Check that immortality is "sticky", so that
	once an object is immortal it remains so."""
	if size < _2G:
	# Not enough memory to cause immortality on overflow
	return
	o1 = o2 = o3 = o4 = o5 = o6 = o7 = o8 = object()
	l = [o1] * (size-20)
	self.assertFalse(_testcapi.is_immortal(o1))
	for _ in range(30):
	l.append(l[0])
	self.assertTrue(_testcapi.is_immortal(o1))
	del o2, o3, o4, o5, o6, o7, o8
	self.assertTrue(_testcapi.is_immortal(o1))
	del l
	self.assertTrue(_testcapi.is_immortal(o1))

All tests in test_bigmem.py are skipped if _testcapi is not available #152168

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Bug report

Bug description:

CPython versions tested on:

Operating systems tested on:

Linked PRs

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StanFromIreland commented on Jun 25, 2026

ShaharNaveh commented on Jun 25, 2026

StanFromIreland commented on Jun 25, 2026

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All tests in `test_bigmem.py` are skipped if `_testcapi` is not available #152168