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gh-128509: Add tests on sys._is_immortal() #157376

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Merged
vstinner merged 4 commits into from
Sep 13, 2026
Merged

gh-128509: Add tests on sys._is_immortal() #157376

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d2edd60
gh-128509: Add tests on sys._is_immortal()
vstinner Sep 12, 2026
3ac1ba1
Workaround marshal limitation
vstinner Sep 13, 2026
556407d
Merge branch 'main' into is_immortal
vstinner Sep 13, 2026
d588cc2
Revert marshal workaround
vstinner Sep 13, 2026
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31 changes: 31 additions & 0 deletions Lib/test/test_sys.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1374,6 +1374,37 @@ def test_int_max_str_digits(self):
with self.assertRaises(TypeError):
sys.set_int_max_str_digits(2_048.0)

@test.support.cpython_only
def test_is_immortal(self):
is_immortal = sys._is_immortal

# Singletons
self.assertTrue(is_immortal(None))
self.assertTrue(is_immortal(False))
self.assertTrue(is_immortal(True))
self.assertTrue(is_immortal(0))
self.assertTrue(is_immortal(b''))
self.assertTrue(is_immortal(''))
self.assertTrue(is_immortal(b'x'))
self.assertTrue(is_immortal('x'))
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self.assertTrue(is_immortal(()))

# Static types
self.assertTrue(is_immortal(int))
self.assertTrue(is_immortal(dict))

# Test some mortal objects
class PythonType:
pass
self.assertFalse(is_immortal([1, 2, 3]))
self.assertFalse(is_immortal({'key': 5}))
self.assertFalse(is_immortal(object()))
self.assertFalse(is_immortal(PythonType))
self.assertFalse(is_immortal(2 ** 100))
# Use encode/decode to avoid building the string as a constant
self.assertFalse(is_immortal(b'abc'.decode()))
self.assertFalse(is_immortal('abc'.encode()))


@test.support.cpython_only
@test.support.force_not_colorized_test_class
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