tests/f

--- a/tests/f	Sun May 15 11:50:49 2016 -0700
+++ b/tests/f	Sun May 15 10:39:44 2016 +0900
@@ -25,7 +25,6 @@
 
 from __future__ import absolute_import
 
-import errno
 import glob
 import optparse
 import os