Python 2 requires specifying the file encoding
See also:
https://www.python.org/dev/peps/pep-0263/
https://bugs.gentoo.org/show_bug.cgi?id=608324

--- a/tests/test_reading.py
+++ b/tests/test_reading.py
@@ -1,3 +1,5 @@
+# -*- coding: utf-8 -*-
+
 from __future__ import with_statement
 import random, threading, time