passing python2 tests: from __future__ import print_function

tests/test_general.py

@@ -1,5 +1,6 @@
 """Non-core-specific tests for cachier."""
 
+from __future__ import print_function
 import os
 
 import cachier

tests/test_mongo_core.py

@@ -1,5 +1,6 @@
 """Testing the MongoDB core of cachier."""
 
+from __future__ import print_function
 import datetime
 import sys
 from random import random