change test

components.my-component.js

export default Ember.Component.extend({
  foo: false,
  bar: false,
  actions: {
    change() {
      console.log('changing!');
		  this.set('foo', !this.get('foo'));
	  }
  }
});

components.nested-component.js

export default Ember.Component.extend({
  bar: Ember.computed({
    get() {
      return null;
	},
    set(_, val) {
      console.log('yo!');
	}
  })
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}

{{#my-component}}
  {{nested-component
		foo=foo
    bar=bar
  }}
{{/my-component}}
<br>
<br>

templates.components.my-component.hbs

{{yield}}
<button {{action 'change'}}>Click</button>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}