diff -r 6b3523f81f42 -r 26744ad37953 cubicweb/hooks/test/unittest_hooks.py
--- a/cubicweb/hooks/test/unittest_hooks.py	Fri Apr 05 17:21:14 2019 +0200
+++ b/cubicweb/hooks/test/unittest_hooks.py	Fri Apr 05 17:58:19 2019 +0200
@@ -24,8 +24,6 @@
 
 from datetime import datetime
 
-from six import text_type
-
 from pytz import utc
 
 from cubicweb import ValidationError
@@ -211,7 +209,7 @@
             with self.assertRaises(ValidationError) as cm:
                 cnx.execute('INSERT CWUser X: X login "admin", X upassword "admin"')
             ex = cm.exception
-            ex.translate(text_type)
+            ex.translate(str)
             self.assertIsInstance(ex.entity, int)
             self.assertEqual(ex.errors,
                              {'': u'some relations violate a unicity constraint',