What is the proper way in ember to use scheduleOnce that is test friendly?

Not too uncommon we'll need to schedule an update after rendering completes in reaction to a property change. Here is an example

  page_changed: function() {
    Ember.run.scheduleOnce('afterRender', this, this.scroll);
  }.observes('current_page')

This doesn't work for testing since there is no runloop at the time scheduleOnce is called. We can simply wrap scheduleOnce in an Ember.run

  page_changed: function() {
    Ember.run(function() {
      Ember.run.scheduleOnce('afterRender', that, that.scroll);
    });
  ).observes('current_page')

..but I'm being told that's not the right way to go about it. I thought I'd reach out and get some other ideas.

For reference here is the issue that I opened up in ember.js#10536