test: failIf was deprecated in favor of assertFalse in py3.1

test/unittest_views.py

@@ -122,7 +122,7 @@ class RelationWidgetTC(testlib.CubicWebTC):
             req.form = {'relation': 'language_to:Concept:subject'}
             view = self.vreg['views'].select('search_related_entities', req,
                                              rset=lang.as_rset())
-            self.failIf(view.linkable_rset())
+            self.assertFalse(view.linkable_rset())
         with self.admin_access.repo_cnx() as cnx:
             lang_to_rtype = cnx.find('CWRType', name='language_to').one()
             scheme = cnx.create_entity('ConceptScheme', title=u'languages',