From 55561b5f86cb8fb2fa9f1c539c2482307251b8dc Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Fri, 22 May 2026 15:47:38 +0200
Subject: [PATCH] gh-149879: Fix test_c_locale_coercion on Cygwin (#150250)

---
 Lib/test/test_c_locale_coercion.py | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/Lib/test/test_c_locale_coercion.py b/Lib/test/test_c_locale_coercion.py
index 340bec3c71b6..52323a0ec0ac 100644
--- a/Lib/test/test_c_locale_coercion.py
+++ b/Lib/test/test_c_locale_coercion.py
@@ -47,9 +47,8 @@ elif sys.platform == "darwin":
     # FS encoding is UTF-8 on macOS
     EXPECTED_C_LOCALE_FS_ENCODING = "utf-8"
 elif sys.platform == "cygwin":
-    # Cygwin defaults to using C.UTF-8
-    # TODO: Work out a robust dynamic test for this that doesn't rely on
-    #       CPython's own locale handling machinery
+    DEFAULT_LOCALE_IS_C = False
+    DEFAULT_ENCODING = "utf-8"
     EXPECT_COERCION_IN_DEFAULT_LOCALE = False
 elif sys.platform == "vxworks":
     # VxWorks defaults to using UTF-8 for all system interfaces
-- 
2.47.3