From the Autocomplete Component step under the heading "An Integration Test" after the first code example, the reference this.on has no referent.
Unless I'm misreading the text, or it's down to my lack of knowledge regarding JavaScript & Ember development, I can't find where the this.on call is used. Is this a documentation bug?
From https://github.com/emberjs/ember.js/issues/16370 /cc @rayascott