如何实现流星追踪器功能?

我正在写一个模块支持流星追踪器,但我无法测试它。我补充道 meteor-standalone-tracker 作为dev依赖项,并编写了一个测试用例,但是 autorun 函数只被调用一次。

from the docs

import assert from 'assert';
import Tracker from 'trackr';

describe('Testing Tracker', () => {

  it('should do as expected', () => {

    var favoriteFood = "apples";
    var favoriteFoodDep = new Tracker.Dependency;

    var getFavoriteFood = function () {
      favoriteFoodDep.depend();
      return favoriteFood;
    };

    var setFavoriteFood = function (newValue) {
      favoriteFood = newValue;
      favoriteFoodDep.changed();
    };

    console.log("GET:" , getFavoriteFood());
    // "apples"

    var handle = Tracker.autorun(function () {
      console.log("Your favorite food is " + getFavoriteFood());
    });
    // "Your favorite food is apples"

    setFavoriteFood("mangoes");
    // "Your favorite food is mangoes"
    setFavoriteFood("peaches");
    // "Your favorite food is peaches"
    setFavoriteFood("bananas");
    // "Your favorite food is bananas"
    handle.stop();
    setFavoriteFood("cake");
    // (nothing printed)

  });

});

那个 只有 我得到的结果是:

console.log test/tracker.spec.js:27
   GET: apples

console.log test/tracker.spec.js:31
   Your favorite food is apples

我错过了什么?