diff -r 2dae5bf5ea68 -r b1e933b0e850 server/test/unittest_sqlutils.py
--- a/server/test/unittest_sqlutils.py	Mon Sep 09 12:43:25 2013 +0200
+++ b/server/test/unittest_sqlutils.py	Mon Dec 09 16:13:10 2013 +0100
@@ -1,4 +1,5 @@
-# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+# -*- coding: utf-8 -*-
+# copyright 2003-2013 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
 # contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
 #
 # This file is part of CubicWeb.
@@ -24,6 +25,8 @@
 
 from cubicweb.server.sqlutils import *
 
+from cubicweb.devtools.testlib import CubicWebTC
+
 BASE_CONFIG = {
     'db-driver' : 'Postgres',
     'db-host'   : 'crater',
@@ -44,5 +47,22 @@
         o = SQLAdapterMixIn(config)
         self.assertEqual(o.dbhelper.dbencoding, 'ISO-8859-1')
 
+
+class SQLUtilsTC(CubicWebTC):
+
+    def test_group_concat(self):
+        req = self.request()
+        g = req.create_entity('CWGroup', name=u'héhé')
+        u = req.create_entity('CWUser', login=u'toto', upassword=u'',
+                              in_group=g.eid)
+        rset = self.execute(u'Any L,GROUP_CONCAT(G) GROUPBY L WHERE X login L,'
+                            u'X in_group G, G name GN, NOT G name IN ("users", "héhé")')
+        self.assertEqual([[u'admin', u'3'], [u'anon', u'2']],
+                         rset.rows)
+        rset = self.execute('Any L,GROUP_CONCAT(GN) GROUPBY L WHERE X login L,'
+                            'X in_group G, G name GN, NOT G name "users"')
+        self.assertEqual([[u'admin', u'managers'], [u'anon', u'guests'], [u'toto', u'héhé']],
+                         rset.rows)
+
 if __name__ == '__main__':
     unittest_main()