service-test

components.log-button.js

import Ember from 'ember';

export default Ember.Component.extend({
    logger: Ember.inject.service(),

  actions: {
    test() {
      this.get('logger').log("testing");                                               
    } 
  } 
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
    logger: Ember.inject.service(),


});

services.logger.js

import Ember from 'ember';

export default Ember.Service.extend({
   log(message) {                                                            
     alert(message);
   }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{log-button}}
<br>
<br>

templates.components.log-button.hbs

<button {{action 'test'}}>test</button>

twiddle.json

{
  "version": "0.8.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}