diff -r 31776723c0c5 -r ee6deb534f57 test/unittest_selectors.py
--- a/test/unittest_selectors.py	Fri Jul 30 10:09:31 2010 +0200
+++ b/test/unittest_selectors.py	Fri Jul 30 13:18:36 2010 +0200
@@ -151,6 +151,11 @@
         cls = self.vreg['etypes'].etype_class('Personne')
         self.failIf(is_instance('Societe').score_class(cls, self.request()))
 
+    def test_yams_inheritance(self):
+        cls = self.vreg['etypes'].etype_class('Transition')
+        self.assertEquals(is_instance('BaseTransition').score_class(cls, self.request()),
+                          3)
+
 
 class MatchUserGroupsTC(CubicWebTC):
     def test_owners_group(self):