diff --git a/test.py b/test.py
index fd4c39c..b007a67 100644
--- a/test.py
+++ b/test.py
@@ -17,6 +17,7 @@
 from dateutil.easter import *
 from dateutil.rrule import *
 from dateutil.tz import *
+from dateutil import zoneinfo
 
 from datetime import *
 
@@ -3613,6 +3614,16 @@
         self.assertEqual(datetime(2003,10,26,0,59,tzinfo=tz).tzname(), "EDT")
         self.assertEqual(datetime(2003,10,26,1,00,tzinfo=tz).tzname(), "EST")
 
+    def testZoneInfoFileStart1(self):
+        tz = zoneinfo.gettz("EST5EDT")
+        self.assertEqual(datetime(2003,4,6,1,59,tzinfo=tz).tzname(), "EST")
+        self.assertEqual(datetime(2003,4,6,2,00,tzinfo=tz).tzname(), "EDT")
+        
+    def testZoneInfoFileEnd1(self):
+        tz = zoneinfo.gettz("EST5EDT")
+        self.assertEqual(datetime(2003,10,26,0,59,tzinfo=tz).tzname(), "EDT")
+        self.assertEqual(datetime(2003,10,26,1,00,tzinfo=tz).tzname(), "EST")
+
     def testICalStart1(self):
         tz = tzical(StringIO(self.TZICAL_EST5EDT)).get()
         self.assertEqual(datetime(2003,4,6,1,59,tzinfo=tz).tzname(), "EST")