assertTrue(serverState.update(cn2)) ;
assertTrue(serverState.update(cn3)) ;
// Check toStringSet
ChangeNumber[] cns = {cn2,cn3};
Set<String> stringSet = serverState.toStringSet();
assertEquals(cns.length, stringSet.size());
// TODO Check the value
// Check getMaxChangeNumber
assertEquals(cn2.compareTo(serverState.getMaxChangeNumber(cn2.getServerId())),0);