cpython/Lib/test/test_opcache.py

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import unittest
class TestLoadAttrCache(unittest.TestCase):
def test_descriptor_added_after_optimization(self):
class Descriptor:
pass
class C:
def __init__(self):
self.x = 1
x = Descriptor()
def f(o):
return o.x
o = C()
for i in range(1025):
assert f(o) == 1
Descriptor.__get__ = lambda self, instance, value: 2
Descriptor.__set__ = lambda *args: None
self.assertEqual(f(o), 2)