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[3.13] gh-131677: Fix flaky test_lru_cache_threaded3 (gh-131679) (gh-131692)

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The call to `with self.subTest(...)` was not thread-safe.
(cherry picked from commit a123245986)

Co-authored-by: Sam Gross <colesbury@gmail.com>
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Miss Islington (bot) 2025-03-24 22:05:55 +01:00 • committed by GitHub
parent 3492098418
commit c22eef44d8
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Lib/test/test_functools.py
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@ -1782,8 +1782,7 @@ class TestLRU:
time.sleep(.01)
return 3 * x
def test(i, x):
with self.subTest(thread=i):
self.assertEqual(f(x), 3 * x, i)
self.assertEqual(f(x), 3 * x, i)
threads = [threading.Thread(target=test, args=(i, v))
for i, v in enumerate([1, 2, 2, 3, 2])]
with threading_helper.start_threads(threads):