Issue #9527: datetime.astimezone() method will now supply a class
timezone instance corresponding to the system local timezone when
called with no arguments.
diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py
index e045447..4181d4f 100644
--- a/Lib/test/datetimetester.py
+++ b/Lib/test/datetimetester.py
@@ -3283,11 +3283,11 @@
         dt = self.theclass(2012, 11, 4, 6, 30, tzinfo=timezone.utc)
         local = dt.astimezone()
         self.assertEqual(dt, local)
-        self.assertEqual(local.strftime("%z %Z"), "+0500 EST") 
+        self.assertEqual(local.strftime("%z %Z"), "+0500 EST")
         dt = self.theclass(2012, 11, 4, 5, 30, tzinfo=timezone.utc)
         local = dt.astimezone()
         self.assertEqual(dt, local)
-        self.assertEqual(local.strftime("%z %Z"), "+0400 EDT") 
+        self.assertEqual(local.strftime("%z %Z"), "+0400 EDT")
 
     def test_aware_subtract(self):
         cls = self.theclass