private HashMap<String, String> addAppContainers(Application app) {
    Dispatcher dispatcher = new AsyncDispatcher();
    ApplicationAttemptId appAttemptId = BuilderUtils.newApplicationAttemptId(app.getAppId(), 1);
    Container container1 =
        new MockContainer(appAttemptId, dispatcher, conf, app.getUser(), app.getAppId(), 1);
    Container container2 =
        new MockContainer(appAttemptId, dispatcher, conf, app.getUser(), app.getAppId(), 2);
    nmContext.getContainers().put(container1.getContainerID(), container1);
    nmContext.getContainers().put(container2.getContainerID(), container2);

    app.getContainers().put(container1.getContainerID(), container1);
    app.getContainers().put(container2.getContainerID(), container2);
    HashMap<String, String> hash = new HashMap<String, String>();
    hash.put(container1.getContainerID().toString(), container1.getContainerID().toString());
    hash.put(container2.getContainerID().toString(), container2.getContainerID().toString());
    return hash;
  }