diff -r 79ff784cd8af -r 7f6b5f023884 hooks/test/data/schema.py
--- a/hooks/test/data/schema.py	Fri Sep 11 18:01:36 2015 +0200
+++ b/hooks/test/data/schema.py	Fri Sep 11 18:05:38 2015 +0200
@@ -22,7 +22,7 @@
 
 from cubicweb.schema import ERQLExpression
 
-_ = unicode
+from cubicweb import _
 
 class friend(RelationDefinition):
     subject = ('CWUser', 'CWGroup')