Ember.js 测试"；“装载”；在余烬验收测试中的状态

在验收测试中，我想确认“加载指示器”在异步操作期间是否正确显示和隐藏。假设我有一个动作，看起来像这样：

myAction() {
    this.set('isLoading', true);
    someAsyncMethod().then(answer => {
        this.set('isLoading', false);
    });
}

<button class="my-button" {{action "myAction"}}>
  {{#if isLoading}}
    <i class="loader"></i>
  {{/if}}
  Click me !
</button>

以及一个如下所示的模板：

myAction() {
    this.set('isLoading', true);
    someAsyncMethod().then(answer => {
        this.set('isLoading', false);
    });
}

<button class="my-button" {{action "myAction"}}>
  {{#if isLoading}}
    <i class="loader"></i>
  {{/if}}
  Click me !
</button>

我的问题是：在哪里可以断言加载程序已显示

test('My super action', function(assert) {
  visit('/my-route');
  andThen(() => {
      click('.my-button');
      // Here, since the click() helper is async, the action isn't 
      // called, so the loader isn't shown yet.
      Ember.run.next(function () {
        //here is fine, as we are in the next run loop the promise returned in the action has started loading
      });
  });
  andThen(() => {
    // Here, the load is finished, so the loader is removed
  });
});