public void testCalculator() throws Exception {
ExtensionPointRegistry registry = ((NodeImpl)node).getExtensionPointRegistry();
UtilityExtensionPoint utilities = registry.getExtensionPoint(UtilityExtensionPoint.class);
MonitorFactory monitorFactory = utilities.getUtility(MonitorFactory.class);
Monitor monitor = monitorFactory.createMonitor();
Problem problem = ((DefaultLoggingMonitorImpl)monitor).getLastLoggedProblem();
assertNotNull(problem);
assertEquals("ReferenceNotFound", problem.getMessageId());
}