added unicode_literals import at start of each file
diff --git a/erpnext/stock/tests.py b/erpnext/stock/tests.py
index acd0edc..92378dc 100644
--- a/erpnext/stock/tests.py
+++ b/erpnext/stock/tests.py
@@ -14,6 +14,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from __future__ import unicode_literals
 import unittest
 
 import sys