[3.13] gh-133711: Fix test_readline.test_nonascii() for UTF-8 Mode (GH-134841) (#134852)

miss-islington · vstinner · web-flow · commit 07d4b6313f6c · 2025-05-28T16:08:08.000Z
gh-133711: Fix test_readline.test_nonascii() for UTF-8 Mode (GH-134841) Skip the test if the Python UTF-8 Mode is enabled and the LC_CTYPE encoding is not UTF-8. (cherry picked from commit 4635115) Co-authored-by: Victor Stinner <vstinner@python.org>
diff --git a/Lib/test/test_readline.py b/Lib/test/test_readline.py
@@ -1,6 +1,7 @@
 """
 Very minimal unittests for parts of the readline module.
 """
+import codecs
 import locale
 import os
 import sys
@@ -228,6 +229,13 @@ def test_nonascii(self):
             # writing and reading non-ASCII bytes into/from a TTY works, but
             # readline or ncurses ignores non-ASCII bytes on read.
             self.skipTest(f"the LC_CTYPE locale is {loc!r}")
+        if sys.flags.utf8_mode:
+            encoding = locale.getencoding()
+            encoding = codecs.lookup(encoding).name  # normalize the name
+            if encoding != "utf-8":
+                # gh-133711: The Python UTF-8 Mode ignores the LC_CTYPE locale
+                # and always use the UTF-8 encoding.
+                self.skipTest(f"the LC_CTYPE encoding is {encoding!r}")
 
         try:
             readline.add_history("\xEB\xEF")
