From 8752dfbd1f0c96ca09cdacabaf0d0f8c3895b6ce Mon Sep 17 00:00:00 2001
From: native-api <ivan_pozdeev@mail.ru>
Date: Thu, 6 Dec 2018 10:04:35 +0300
Subject: [PATCH] bpo-33709: test_ntpath and test_posixpath fail in Windows
 with ACP!=1252. (GH-7278)

---
 Lib/test/support/__init__.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
index f90212cd7ec..05e8593f982 100644
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -871,7 +871,11 @@ for character in (
     '\u20AC',
 ):
     try:
-        os.fsdecode(os.fsencode(character))
+        # If Python is set up to use the legacy 'mbcs' in Windows,
+        # 'replace' error mode is used, and encode() returns b'?'
+        # for characters missing in the ANSI codepage
+        if os.fsdecode(os.fsencode(character)) != character:
+            raise UnicodeError
     except UnicodeError:
         pass
     else: