final String filename = "com/opensymphony/xwork2/config/providers/xwork-unknownhandler-stack-empty.xml";
ConfigurationProvider provider = buildConfigurationProvider(filename);
loadConfigurationProviders(provider);
configurationManager.reload();
UnknownHandlerManager unknownHandlerManager = new DefaultUnknownHandlerManager();
container.inject(unknownHandlerManager);
List<UnknownHandler> unknownHandlers = unknownHandlerManager.getUnknownHandlers();
assertNotNull(unknownHandlers);
assertEquals(2, unknownHandlers.size());
UnknownHandler uh1 = unknownHandlers.get(0);