--- a/cubicweb/test/unittest_req.py	Fri Nov 04 11:57:09 2016 +0100
+++ b/cubicweb/test/unittest_req.py	Fri Nov 04 13:12:10 2016 +0100
@@ -45,31 +45,6 @@
         self.assertRaises(AssertionError, req.build_url, 'one', 'two not allowed')
         self.assertRaises(AssertionError, req.build_url, 'view', test=None)
 
-    def test_build_url_language_from_url(self):
-        # need req.vreg.config to exist because lang is read in it at set_language() call
-        vreg = MockVReg()
-        vreg.config.global_set_option('language-mode', 'url-prefix')
-        req = RequestSessionBase(vreg)
-        req.base_url = lambda secure=None: 'http://testing.fr/cubicweb/'
-        self.assertIsNone(req.lang)  # language unset yet.
-        self.assertEqual(req.build_url(), 'http://testing.fr/cubicweb/view')
-        self.assertEqual(req.build_url('foo'), 'http://testing.fr/cubicweb/foo')
-        req.set_language('fr')
-        self.assertEqual(req.lang, 'fr')
-        self.assertEqual(req.build_url(), 'http://testing.fr/cubicweb/fr/view')
-        self.assertEqual(req.build_url('foo'), 'http://testing.fr/cubicweb/fr/foo')
-        req.set_language('en')
-        self.assertEqual(req.lang, 'en')
-        self.assertEqual(req.build_url(), 'http://testing.fr/cubicweb/en/view')
-        self.assertEqual(req.build_url('foo'), 'http://testing.fr/cubicweb/en/foo')
-        # no language prefix in URL
-        vreg.config.global_set_option('language-mode', '')
-        self.assertEqual(req.build_url(), 'http://testing.fr/cubicweb/view')
-        self.assertEqual(req.build_url('foo'), 'http://testing.fr/cubicweb/foo')
-        req.set_language('fr')
-        self.assertEqual(req.build_url(), 'http://testing.fr/cubicweb/view')
-        self.assertEqual(req.build_url('foo'), 'http://testing.fr/cubicweb/foo')
-
     def test_ensure_no_rql(self):
         req = RequestSessionBase(None)
         self.assertEqual(req.ensure_ro_rql('Any X WHERE X is CWUser'), None)
@@ -78,13 +53,6 @@
         self.assertRaises(Unauthorized, req.ensure_ro_rql, '   SET X login "toto" WHERE X is CWUser   ')
 
 
-class MockVReg(object):
-    """Fake VReg with just a basic config in it.
-    """
-    def __init__(self):
-        self.config = ApptestConfiguration('data', __file__)
-
-
 class RequestCWTC(CubicWebTC):
 
     def test_base_url(self):