Used unicode for usage key.

cms/djangoapps/contentstore/views/tests/test_container_page.py

@@ -182,6 +182,6 @@ class ContainerPageTestCase(StudioPageTestCase):
         # Check 200 response if 'usage_key_string' is correct
         response = views.container_handler(
             request=request,
-            usage_key_string=self.vertical.location.to_deprecated_string()
+            usage_key_string=unicode(self.vertical.location)
         )
         self.assertEqual(response.status_code, 200)