diff -r 46f41c3e1443 -r 697a8181ba30 entities/test/unittest_base.py
--- a/entities/test/unittest_base.py	Mon Aug 26 16:12:30 2013 +0200
+++ b/entities/test/unittest_base.py	Mon Aug 26 16:14:09 2013 +0200
@@ -25,7 +25,6 @@
 
 from cubicweb.devtools.testlib import CubicWebTC
 
-from cubicweb.interfaces import IMileStone, ICalendarable
 from cubicweb.entities import AnyEntity
 
 
@@ -134,27 +133,6 @@
         self.request().create_entity('CWGroup', name=u'logilab', reverse_in_group=e)
 
 
-class InterfaceTC(CubicWebTC):
-
-    def test_nonregr_subclasses_and_mixins_interfaces(self):
-        from cubicweb.entities.wfobjs import WorkflowableMixIn
-        WorkflowableMixIn.__implements__ = (ICalendarable,)
-        CWUser = self.vreg['etypes'].etype_class('CWUser')
-        class MyUser(CWUser):
-            __implements__ = (IMileStone,)
-        self.vreg._loadedmods[__name__] = {}
-        self.vreg.register(MyUser)
-        self.vreg['etypes'].initialization_completed()
-        MyUser_ = self.vreg['etypes'].etype_class('CWUser')
-        # a copy is done systematically
-        self.assertTrue(issubclass(MyUser_, MyUser))
-        self.assertTrue(implements(MyUser_, IMileStone))
-        self.assertTrue(implements(MyUser_, ICalendarable))
-        # original class should not have beed modified, only the copy
-        self.assertTrue(implements(MyUser, IMileStone))
-        self.assertFalse(implements(MyUser, ICalendarable))
-
-
 class SpecializedEntityClassesTC(CubicWebTC):
 
     def select_eclass(self, etype):