diff --git a/Lib/test/libregrtest/runtest_mp.py b/Lib/test/libregrtest/runtest_mp.py
index 13649ce10b3a41..c6a4dae2df86a9 100644
--- a/Lib/test/libregrtest/runtest_mp.py
+++ b/Lib/test/libregrtest/runtest_mp.py
@@ -21,6 +21,9 @@
from test.libregrtest.setup import setup_tests
from test.libregrtest.utils import format_duration, print_warning
+if sys.platform == 'win32':
+ import locale
+
# Display the running tests if nothing happened last N seconds
PROGRESS_UPDATE = 30.0 # seconds
@@ -259,11 +262,16 @@ def _run_process(self, test_name: str, stdout_fh: TextIO) -> int:
self.current_test_name = None
def _runtest(self, test_name: str) -> MultiprocessResult:
+ if sys.platform == 'win32':
+ # gh-95027: When stdout is not a TTY, Python uses the ANSI code
+ # page for the sys.stdout encoding. If the main process runs in a
+ # terminal, sys.stdout uses WindowsConsoleIO with UTF-8 encoding.
+ encoding = locale.getencoding()
+ else:
+ encoding = sys.stdout.encoding
# gh-94026: Write stdout+stderr to a tempfile as workaround for
# non-blocking pipes on Emscripten with NodeJS.
- with tempfile.TemporaryFile(
- 'w+', encoding=sys.stdout.encoding
- ) as stdout_fh:
+ with tempfile.TemporaryFile('w+', encoding=encoding) as stdout_fh:
# gh-93353: Check for leaked temporary files in the parent process,
# since the deletion of temporary files can happen late during
# Python finalization: too late for libregrtest.
diff --git a/Misc/NEWS.d/next/Tests/2022-10-20-17-49-50.gh-issue-95027.viRpJB.rst b/Misc/NEWS.d/next/Tests/2022-10-20-17-49-50.gh-issue-95027.viRpJB.rst
new file mode 100644
index 00000000000000..8bf1a9d33573ab
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2022-10-20-17-49-50.gh-issue-95027.viRpJB.rst
@@ -0,0 +1,4 @@
+On Windows, when the Python test suite is run with the ``-jN`` option, the
+ANSI code page is now used as the encoding for the stdout temporary file,
+rather than using UTF-8 which can lead to decoding errors. Patch by Victor
+Stinner.
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