/**
  * Checks the size of the listeners collection retrieved by {@link #getGerritEventListeners()}.
  *
  * @param extra number of added listeners, other than the default.
  */
 void assertNrOfEventListeners(int extra) {
   Collection<GerritEventListener> gerritEventListeners = getGerritEventListeners();
   int nbrOfListeners = extra;
   nbrOfListeners++; // EventListener adds 1 listener
   nbrOfListeners++; // DependencyQueueTaskDispatcher adds 1 listener
   nbrOfListeners++; // ReplicationQueueTaskDispatcher adds 1 listener
   GerritServer server = PluginImpl.getServer_(PluginImpl.DEFAULT_SERVER_NAME);
   if (server.isConnected()
       && server.getConfig().isEnableProjectAutoCompletion()
       && server.isProjectCreatedEventsSupported()) {
     nbrOfListeners++; // GerritProjectListUpdater adds 1 listener//
   }
   assertEquals(nbrOfListeners, gerritEventListeners.size());
 }