Index: Lib/test/test_old_mailbox.py
===================================================================
--- Lib/test/test_old_mailbox.py	(révision 78103)
+++ Lib/test/test_old_mailbox.py	(copie de travail)
@@ -102,11 +102,12 @@
         import email.parser
         fname = self.createMessage("cur", True)
         n = 0
-        for msg in mailbox.PortableUnixMailbox(open(fname),
-                                               email.parser.Parser().parse):
-            n += 1
-            self.assertEqual(msg["subject"], "Simple Test")
-            self.assertEqual(len(str(msg)), len(FROM_)+len(DUMMY_MESSAGE))
+        with open(fname) as f:
+            for msg in mailbox.PortableUnixMailbox(f,
+                                                   email.parser.Parser().parse):
+                n += 1
+                self.assertEqual(msg["subject"], "Simple Test")
+                self.assertEqual(len(str(msg)), len(FROM_)+len(DUMMY_MESSAGE))
         self.assertEqual(n, 1)
 
 class MboxTestCase(unittest.TestCase):
@@ -138,8 +139,9 @@
 body4
 """)
         f.close()
-        box = mailbox.UnixMailbox(open(self._path, 'r'))
-        self.assertTrue(len(list(iter(box))) == 4)
+        with open(self._path, 'r') as f:
+            box = mailbox.UnixMailbox(f)
+            self.assertTrue(len(list(iter(box))) == 4)
 
 
     # XXX We still need more tests!