def testDowncast(self):
sw=StealWorker(debug_id='bob builder')
sw.save()
workers=NodeSet(debug_id='workers')
workers.save()
sw.add_to_parent(workers)
for o in workers.flatten(klass=Worker):
self.assertTrue(o.__class__==Worker)
for o in workers.flatten(klass=StealWorker):
self.assertTrue(o.__class__==StealWorker)
