Component Lifecycle Mut

components.x-child.js

import Ember from 'ember';

export default Ember.Component.extend({
  init() {
    this._super(...arguments);
    console.log('\ninit', this.get('vInit'));
    this.set('vInit', 99);
  },
  
  didReceiveAttrs() {
    this._super(...arguments);
    console.log('\ndidReceiveAttrs', this.get('vDidReceiveAttrs'));
    this.set('vDidReceiveAttrs', 99);
  },
  
  willRender() {
    this._super(...arguments);
    console.log('\nwillRender', this.get('vWillRender'));
    this.set('vWillRender', 99);
  },
  
  didInsertElement() {
    this._super(...arguments);
    //console.log('\ndidInsertElement', this.get('vDidInsertElement'));
    //this.set('vDidInsertElement', 99);
  }
});

controllers.application.js

import Ember from 'ember';

const {
  Controller,
  observer
} = Ember;

export default Controller.extend({
  appName: 'Ember Twiddle',
  vInit: 1,
  vDidReceiveAttrs: 2,
  vWillRender: 3,
  vDidInsertElement: 4,
  
  oInit: observer('vInit', function() {
    console.log('init changed value', this.get('vInit'));
  }),
  
  oDidReceiveAttrs: observer('vDidReceiveAttrs', function() {
    console.log('didReceiveAttrs changed value', this.get('vDidReceiveAttrs'));
  }),
  
  oWillRender: observer('vWillRender', function() {
    console.log('willRender changed value', this.get('vWillRender'));
  }),
  
  oDidInsertElement: observer('vDidInsertElement', function() {
    console.log('didInsertElement changed value', this.get('vDidInsertElement'));
  })
});

templates.application.hbs

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

{{x-child
	vInit=vInit
  vDidReceiveAttrs=vDidReceiveAttrs
  vWillRender=vWillRender
  vDidInsertElement=vDidInsertElement}}

tests.helpers.destroy-app.js

import { run } from '@ember/runloop';

export default function destroyApp(application) {
  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';
import { start } from 'ember-cli-qunit';

setResolver(resolver);
start();

twiddle.json

{
  "version": "0.10.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "3.2.1",
    "ember-template-compiler": "3.2.2"
  },
  "addons": {}
}