test-service-binding

controllers.application.js

import Ember from 'ember';

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

router.js

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

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('flip')
});

export default Router;

routes.flip.js

import Ember from 'ember';

export default Ember.Route.extend({
  session: Ember.inject.service(),
  
  model(){
    this.get('session').set('testing', true);
  }
});

services.session.js

import Ember from 'ember';

export default Ember.Service.extend({
  testing: false
});

templates.application.hbs

The value of testing is: {{if session.testing "yep" "nope"}}
{{#link-to "flip"}}Flip value{{/link-to}}
{{outlet}}

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": "release",
    "ember-template-compiler": "release",
    "ember-testing": "release"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}