Player

components.my-player.js

import Ember from 'ember';

export default Ember.Component.extend({
 
  init(){
    this._super(...arguments);
    this.set('state', 'stopped');
  },
  
  didStateChanged: Ember.observer('state', function(){
    console.log('didStateChanged', this.get('state'));
    
    if(this.get('state') === 'playing'){
      this.play();
    }
    
		if(this.get('state') === 'stopped'){
			this.stop();
		}
    
		if(this.get('state') === 'replay'){
			this.stop();
			this.reset();
			this.play();
      // Ember.run.next(() => this.notifyPropertyChange('state'));
		}    
  }),
  
	didTimeChanged: Ember.observer('time', function(){
    if(this.get('time') === 10){
      this.stop();
    }
  }),
  
  reset(){
		this.set('time', 0);
  },
  
  play(){
		this.set('state', 'playing');
    
		if( this.get('interval') ){
    	clearTimeout( this.get('interval') );
		}
    
  	this.set('interval', setInterval(() => {
      this.incrementProperty('time')
    }, 1000));
  },
  
  stop(){
    this.set('state', 'stopped');
    clearTimeout( this.get('interval') );
  }
  
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({

  actions: {
  	play(){
			this.set('state', 'playing');		
		},
    
  	stop(){
			this.set('state', 'stopped');
		},
    
  	replay(){
  		this.set('state', 'replay');
		},
    
    playClip(start,end){
      this.set('timeStart', start);
			this.set('timeEnd', end);
      this.set('state', 'replay');
    }
	}
});

templates.application.hbs

{{my-player timeStart=0 timeEnd=30 state=(mut state) time=(mut time)}}
{{input type="range" min=timeMin max=timeEnd value=time}}

<button {{action "play"}}>Play</button>
<button {{action "stop"}}>Stop</button>
<button {{action "replay"}}>Replay</button>

<p> Start: {{input value=timeStart}} </p>
<p> End: {{input value=timeEnd}} </p>

<hr>

<button {{action "playClip" 5 15}}> Clip 1 </button>
<button {{action "playClip" 20 23}}> Clip 2 </button>
<button {{action "playClip" 40 45}}> Clip 3 </button>

templates.components.my-player.hbs

{{state}}: {{time}}

tests.helpers.destroy-app.js

import Ember from 'ember';

export default function destroyApp(application) {
  Ember.run(application, 'destroy');
}

tests.helpers.resolver.js

import Resolver from '../../resolver';
import config from '../../config/environment';

const resolver = Resolver.create();

resolver.namespace = {
  modulePrefix: config.modulePrefix,
  podModulePrefix: config.podModulePrefix
};

export default resolver;

tests.helpers.start-app.js

import Ember from 'ember';
import Application from '../../app';
import config from '../../config/environment';

const { run } = Ember;
const assign = Ember.assign || Ember.merge;

export default function startApp(attrs) {
  let application;

  let attributes = assign({rootElement: "#test-root"}, config.APP);
  attributes = assign(attributes, attrs); // use defaults, but you can override;

  run(() => {
    application = Application.create(attributes);
    application.setupForTesting();
    application.injectTestHelpers();
  });

  return application;
}

tests.test-helper.js

import resolver from './helpers/resolver';
import {
  setResolver
} from 'ember-qunit';

setResolver(resolver);

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}