@Test
public void testExpiration() throws Exception {
int period = 15000;
ExpirationManager expirationManager = _server.getExpirationManager();
expirationManager.stop();
expirationManager.setCheckPeriod(15000);
expirationManager.setTimeoutExtension(15000);
expirationManager.start();
final AtomicInteger combinedSubs = countSubscriptions(_server);