field = Client.class.getDeclaredField("callbackPollers");
field.setAccessible(true);
Map callbackPollers = (Map)field.get(client);
assertEquals(1, callbackPollers.size());
CallbackPoller callbackPoller = (CallbackPoller)callbackPollers.values().iterator().next();
field = CallbackPoller.class.getDeclaredField("pollPeriod");
field.setAccessible(true);
Long pollPeriod = (Long)field.get(callbackPoller);
assertEquals(ServiceContainer.HTTP_CONNECTOR_CALLBACK_POLL_PERIOD, pollPeriod.longValue());