Force TestLocalTimeDisambiguation to run on LC_ALL=C

Author: note35

Lib/test/datetimetester.py

@@ -6,6 +6,7 @@
 import fractions
 import io
 import itertools
+import locale
 import os
 import pickle
 import random
@@ -6295,6 +6296,15 @@ def fromutc(self, dt):
 
 class TestLocalTimeDisambiguation(unittest.TestCase):
 
+    @classmethod
+    def setUpClass(cls):
+        cls.old_locale = locale.setlocale(locale.LC_ALL)
+        locale.setlocale(locale.LC_ALL, 'C')
+
+    @classmethod
+    def tearDownClass(cls):
+        locale.setlocale(locale.LC_ALL, cls.old_locale)
+
     def test_vilnius_1941_fromutc(self):
         Vilnius = Europe_Vilnius_1941()