Consistent __future__ imports for tests
diff --git a/tests/test_x509.py b/tests/test_x509.py
index 00c782c..1843196 100644
--- a/tests/test_x509.py
+++ b/tests/test_x509.py
@@ -1,5 +1,5 @@
 # coding: utf-8
-from __future__ import unicode_literals
+from __future__ import unicode_literals, division, absolute_import, print_function
 
 import unittest
 import sys