diff -r 7272ef213b7c Lib/test/test_email/test_inversion.py
--- a/Lib/test/test_email/test_inversion.py	Tue Jul 16 08:32:05 2013 +0200
+++ b/Lib/test/test_email/test_inversion.py	Tue Jul 16 22:19:03 2013 +0800
@@ -43,3 +43,6 @@
             """),),
 
             }
+
+if __name__ == '__main__':
+    unittest.main()