https://github.com/python/cpython/commit/3915f1e6c5215a676495aa7c8b3163bb210576f1
commit: 3915f1e6c5215a676495aa7c8b3163bb210576f1
branch: 3.15
author: Miss Islington (bot) <[email protected]>
committer: serhiy-storchaka <[email protected]>
date: 2026-07-24T12:50:14Z
summary:

[3.15] gh-154582: Fix test_invalid_utf8_arg in non-UTF-8 multibyte locales 
(GH-154584) (GH-154601)

Arbitrary bytes round-trip through surrogateescape only in UTF-8 and
single-byte encodings, not in a stateful multibyte encoding such as EUC-JP.
(cherry picked from commit b1e530ebf3b68e884ab37882d690d95e5d82aef5)

Co-authored-by: Serhiy Storchaka <[email protected]>
Co-authored-by: Claude Opus 4.8 <[email protected]>

files:
M Lib/test/test_cmd_line.py

diff --git a/Lib/test/test_cmd_line.py b/Lib/test/test_cmd_line.py
index a8645af26b25d8..bf8ac2bbac309f 100644
--- a/Lib/test/test_cmd_line.py
+++ b/Lib/test/test_cmd_line.py
@@ -2,6 +2,7 @@
 # Most tests are executed with environment variables ignored
 # See test_cmd_line_script.py for testing of script execution
 
+import locale
 import os
 import re
 import subprocess
@@ -369,9 +370,27 @@ def run_no_utf8_mode(arg):
         )
         test_args = [valid_utf8, invalid_utf8]
 
-        for run_cmd in (run_default, run_c_locale, run_utf8_mode,
-                        run_no_utf8_mode):
-            with self.subTest(run_cmd=run_cmd):
+        for run_cmd, encoding in (
+            (run_default, sys.getfilesystemencoding()),
+            (run_c_locale, None),
+            (run_utf8_mode, None),
+            (run_no_utf8_mode, locale.getencoding())
+        ):
+            with self.subTest(run_cmd=run_cmd.__name__):
+                # Arbitrary bytes round-trip through surrogateescape only in
+                # UTF-8 and single-byte encodings, not in a multibyte encoding
+                # such as EUC-JP.
+                if encoding is not None:
+                    try:
+                        lossless = len(bytes(range(256)).decode(
+                            encoding, 'surrogateescape')) == 256
+                    except UnicodeError:
+                        lossless = False
+                else:
+                    lossless = True
+                if not lossless:
+                    self.skipTest(f'{encoding} cannot losslessly '
+                                  f'round-trip arbitrary bytes')
                 for arg in test_args:
                     proc = run_cmd(arg)
                     self.assertEqual(proc.stdout.rstrip(), ascii(arg))

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