[Python-checkins] bpo-45128: fixes `test_multiprocessing_fork` mysterious crash (GH-28387)

[miss-islington]

https://github.com/python/cpython/commit/0e9608680525b120fc8eaad9f1cb2f729a6c22ae
commit: 0e9608680525b120fc8eaad9f1cb2f729a6c22ae
branch: 3.10
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: miss-islington <31488909+miss-islington at users.noreply.github.com>
date: 2021-09-19T16:13:04-07:00
summary:

bpo-45128: fixes `test_multiprocessing_fork` mysterious crash (GH-28387)

(cherry picked from commit 1d42408495402b06ecae91420735aeff454be6b5)

Co-authored-by: Nikita Sobolev <mail at sobolevn.me>

files:
A Misc/NEWS.d/next/Tests/2021-09-16-17-22-35.bpo-45128.Jz6fl2.rst
M Lib/test/test_logging.py

diff --git a/Lib/test/test_logging.py b/Lib/test/test_logging.py
index c969a3f7665d3..8356e6be24baf 100644
--- a/Lib/test/test_logging.py
+++ b/Lib/test/test_logging.py
@@ -4421,8 +4421,10 @@ def _extract_logrecord_process_name(key, logMultiprocessing, conn=None):
             name = mp.current_process().name
 
             r1 = logging.makeLogRecord({'msg': f'msg1_{key}'})
-            del sys.modules['multiprocessing']
-            r2 = logging.makeLogRecord({'msg': f'msg2_{key}'})
+
+            # https://bugs.python.org/issue45128
+            with support.swap_item(sys.modules, 'multiprocessing', None):
+                r2 = logging.makeLogRecord({'msg': f'msg2_{key}'})
 
             results = {'processName'  : name,
                        'r1.processName': r1.processName,
@@ -4471,7 +4473,6 @@ def test_multiprocessing(self):
             if multiprocessing_imported:
                 import multiprocessing
 
-
     def test_optional(self):
         r = logging.makeLogRecord({})
         NOT_NONE = self.assertIsNotNone
diff --git a/Misc/NEWS.d/next/Tests/2021-09-16-17-22-35.bpo-45128.Jz6fl2.rst b/Misc/NEWS.d/next/Tests/2021-09-16-17-22-35.bpo-45128.Jz6fl2.rst
new file mode 100644
index 0000000000000..b50eb32b3faa8
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2021-09-16-17-22-35.bpo-45128.Jz6fl2.rst
@@ -0,0 +1,2 @@
+Fix ``test_multiprocessing_fork`` failure due to ``test_logging`` and
+``sys.modules`` manipulation.