so#44194590

components.my-component.js

export default Ember.Component.extend({
  foo: false,

  bar() {
    this.set('foo', true);
  },

  someService: Ember.inject.service('some-service'),

  didInsertElement: function () {
    const someService = this.get('someService');
    someService.registerComponent(this);
  },
  
  willDestroyElement: function() {
    this.get('someService').unregisterComponent(this);
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  someService: Ember.inject.service(),
  
  actions : {
    click() {
      this.get('someService').runBar(0);
    }
  }
});

services.some-service.js

export default Ember.Service.extend({
  components: [],
  registerComponent: function (component) {
    let components = this.get('components');
    components.push(component);
  },
  
  unregisterComponent: function (component) {
    let components = this.get('components');
    components.removeObject(component);
  },
  
  runBar(index) {
    let components = this.get('components');
    components[index].bar();
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{my-component}}

<button onclick={{action 'click'}}>Push</button>
<br>
<br>

templates.components.my-component.hbs

{{yield}}
{{foo}}

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.integration.components.my-component-test.js

import { moduleForComponent, test } from 'ember-qunit';
import wait from 'ember-test-helpers/wait';
import hbs from 'htmlbars-inline-precompile';

moduleForComponent('my-component', 'TODO: put something here', {
  integration: true,
  
  beforeEach: function () {
      this.set('some-service', Ember.getOwner(this).lookup('service:some-service'));
  }
});

test('it renders', function(assert) {

  // Set any properties with this.set('myProperty', 'value');
  // Handle any actions with this.on('myAction', function(val) { ... });

  this.render(hbs`{{my-component}}`);

  assert.equal(this.$().text().trim(), 'false');

  Ember.run(()=>Ember.getOwner(this).lookup('service:some-service').runBar(0));
  
  return wait().then(() => {
  	assert.equal(this.$().text().trim(), 'true');
  });
});

tests.test-helper.js

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

setResolver(resolver);

tests.unit.services.some-service-test.js

import { moduleFor, test } from 'ember-qunit';

moduleFor('service:some-service', 'TODO: put something here', {
  // Specify the other units that are required for this test.
  // needs: ['service:foo']
});

// Replace this with your real tests.
test('it exists', function(assert) {
  let service = this.subject();
  assert.ok(service);
  
  var x = 0;
  var y = 0;
  let stubComponent1 = Ember.Object.create({bar: function() { x++; }});
  let stubComponent2= Ember.Object.create({bar: function() { y++; }});
  
  service.registerComponent(stubComponent1); 
  service.registerComponent(stubComponent2);                             
  
  service.runBar(0);
  assert.equal(x, 1);
  service.runBar(1);
  assert.equal(y, 1);
  
  service.unregisterComponent(stubComponent1);
  service.runBar(0);
  assert.equal(x, 1);
  assert.equal(y, 2);
  
  service.unregisterComponent(stubComponent2);
});

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": true
  },
  "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"
  }
}