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gh-142651 demonstrate that the test fails on main #142674

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gh-142651 demonstrate that the test fails on main #142674

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17 changes: 17 additions & 0 deletions Lib/test/test_unittest/testmock/testthreadingmock.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
import time
import unittest
import threading
import concurrent.futures

from test.support import threading_helper
Expand Down Expand Up @@ -196,6 +197,22 @@ def test_reset_mock_resets_wait(self):
m.wait_until_any_call_with()
m.assert_called_once()

def test_call_count_thread_safe(self):
m = ThreadingMock()
# 3k loops reliably reproduces the issue while keeping runtime ~0.6s
LOOPS = 3_000
THREADS = 10
def test_function():
for _ in range(LOOPS):
m()
threads = [threading.Thread(target=test_function) for _ in range(THREADS)]
for thread in threads:
thread.start()
for thread in threads:
thread.join()

self.assertEqual(m.call_count, LOOPS * THREADS)


if __name__ == "__main__":
unittest.main()
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