text: import Vue from 'vue';
  import Element from 'main/index.js';
  
  Vue.use(Element);
  
  let id = 0;
  
  const createElm = function() {
    const elm = document.createElement('div');
  
    elm.id = 'app' + ++id;
    document.body.appendChild(elm);
  
    return elm;
  };
  
  /**
   * 回收 vm
   * @param  {Object} vm
   */
  exports.destroyVM = function(vm) {
    vm.$el &&
    vm.$el.parentNode &&
    vm.$el.parentNode.removeChild(vm.$el);
  };
  
  /**
   * 创建一个 Vue 的实例对象
   * @param  {Object|String}  Compo   组件配置，可直接传 template
   * @param  {Boolean=false} mounted 是否添加到 DOM 上
   * @return {Object} vm
   */
  exports.createVue = function(Compo, mounted = false) {
    const elm = createElm();
  
    if (Object.prototype.toString.call(Compo) === '[object String]') {
      Compo = { template: Compo };
    }
    return new Vue(Compo).$mount(mounted === false ? null : elm);
  };
  
  /**
   * 创建一个测试组件实例
   * @link http://vuejs.org/guide/unit-testing.html#Writing-Testable-Components
   * @param  {Object}  Compo          - 组件对象
   * @param  {Object}  propsData      - props 数据
   * @param  {Boolean=false} mounted  - 是否添加到 DOM 上
   * @return {Object} vm
   */
  exports.createTest = function(Compo, propsData = {}, mounted = false) {
    if (propsData === true || propsData === false) {
      mounted = propsData;
      propsData = {};
    }
    const elm = createElm();
    const Ctor = Vue.extend(Compo);
    return new Ctor({ propsData }).$mount(mounted === false ? null : elm);
  };
  
  /**
   * 触发一个事件
   * mouseenter, mouseleave, mouseover, keyup, change, click 等
   * @param  {Element} elm
   * @param  {String} name
   * @param  {*} opts
   */
  exports.triggerEvent = function(elm, name, ...opts) {
    let eventName;
  
    if (/^mouse|click/.test(name)) {
      eventName = 'MouseEvents';
    } else if (/^key/.test(name)) {
      eventName = 'KeyboardEvent';
    } else {
      eventName = 'HTMLEvents';
    }
    const evt = document.createEvent(eventName);
  
    evt.initEvent(name, ...opts);
    elm.dispatchEvent
      ? elm.dispatchEvent(evt)
      : elm.fireEvent('on' + name, evt);
  
    return elm;
  };
  