Fix setup of testLegacySimulationInvoice

git-svn-id: https://svn.erp5.org/repos/public/erp5/sandbox/amount_generator@38052 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Legacy/tests/testLegacyRuleOrder.py

@@ -51,7 +51,7 @@ def catalogObjectListWrapper(self, object_list, method_id_list=None,
     portal.catalogged_object_path_dict[q.getPath()] = 1
   transaction.commit()
 
-class TestOrderMixin:
+class TestOrderMixin(object):
 
   default_quantity = 99
   default_price = 555