[3.11] gh-113027: Fix test_variable_tzname in test_email (GH-113821) (GH-113832)

Determine the support of the Kyiv timezone by checking the result of
astimezone() which uses the system tz database and not the one
populated by zoneinfo.
(cherry picked from commit 931d7e052e22aa01e18fcc67ed71b6ea305aff71)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

diff --git a/Lib/test/test_email/test_utils.py b/Lib/test/test_email/test_utils.py
index 81109a7508ac0d834aa8797b2b4924ce316e8703..342b8507355d7115af6e2923df14d5eca4004204 100644 (file)
--- a/Lib/test/test_email/test_utils.py
+++ b/Lib/test/test_email/test_utils.py
@@ -143,12 +143,12 @@ class LocaltimeTests(unittest.TestCase):
         t2 = utils.localtime(t0.replace(tzinfo=None))
         self.assertEqual(t1, t2)
 
-    @unittest.skipUnless("Europe/Kyiv" in zoneinfo.available_timezones(),
-                         "Can't find a Kyiv timezone database")
     @test.support.run_with_tz('Europe/Kyiv')
     def test_variable_tzname(self):
         t0 = datetime.datetime(1984, 1, 1, tzinfo=datetime.timezone.utc)
         t1 = utils.localtime(t0)
+        if t1.tzname() in ('Europe', 'UTC'):
+            self.skipTest("Can't find a Kyiv timezone database")
         self.assertEqual(t1.tzname(), 'MSK')
         t0 = datetime.datetime(1994, 1, 1, tzinfo=datetime.timezone.utc)
         t1 = utils.localtime(t0)