Oct 21, 2022 · Oct 20, 2022
diff --git a/Lib/test/libregrtest/runtest_mp.py b/Lib/test/libregrtest/runtest_mp.py
 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
            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
 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.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -22,6 +22,9 @@
		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
Expand DownExpand Up		@@ -267,11 +270,16 @@ def _run_process(self, test_name: str, tmp_dir: 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.
Expand Down
Original file line number	Diff line number	Diff line change
		@@ -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.