Merge branch 'fix-issue-142651' of https://github.com/chaope/cpython into fix-issue-142651

Author: chaope

Misc/NEWS.d/next/Library/2025-12-13-06-17-44.gh-issue-142651.ZRtBu4.rst

@@ -1 +1,3 @@
-Fixed a thread safety issue in :mod:`unittest.mock` where :attr:`~unittest.mock.Mock.call_count` could return inaccurate values when a mock was called concurrently from multiple threads. The attribute now derives its value from the length of :attr:`~unittest.mock.Mock.call_args_list` to ensure consistency.
+:mod:`unittest.mock`: fix a thread safety issue where :attr:`Mock.call_count
+<unittest.mock.Mock.call_count>` may return inaccurate values when the mock
+is called concurrently from multiple threads.