--- a/cubicweb/test/unittest_req.py	Tue Apr 25 17:31:24 2017 +0200
+++ b/cubicweb/test/unittest_req.py	Wed Apr 26 15:04:40 2017 +0200
@@ -148,12 +148,12 @@
             self.assertEqual(len(users), 2)
 
             with self.assertRaisesRegexp(
-                AssertionError, '^chapeau not in CWUser subject relations$'
+                KeyError, "^'chapeau not in CWUser subject relations'$"
             ):
                 req.find('CWUser', chapeau=u"melon")
 
             with self.assertRaisesRegexp(
-                AssertionError, '^buddy not in CWUser object relations$'
+                KeyError, "^'buddy not in CWUser object relations'$"
             ):
                 req.find('CWUser', reverse_buddy=users[0])