int period = 15000;
ExpirationManager expirationManager = _server.getExpirationManager();
expirationManager.stop();
expirationManager.setCheckPeriod(15000);
expirationManager.setTimeoutExtension(15000);
expirationManager.start();
final AtomicInteger combinedSubs = countSubscriptions(_server);
final AtomicInteger fakeSubs = countSubscriptions(_server.getFakeServer());
final AtomicInteger realSubs = countSubscriptions(_server.getRealServer());