New Twiddle

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  editMode: false,
  
  actions: {
  	toggleEditMode(){
      this.toggleProperty('editMode');
    }
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
    {{#my-component as |cp|}}
      {{#if cp}}
        <p>Editable Yield</p>
      {{else}}
        <p>Normal Yield</p>
      {{/if}}
    {{/my-component}}

templates.components.my-component.hbs

<button {{action "toggleEditMode"}}>toggleEditMode</button>
{{editMode}}
<hr>
{{yield editMode}}

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

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

moduleForComponent('my-component', 'TODO: put something here', {
  integration: true
});

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

  // I want to have to pass the 2 different 'yield' to the component 
  // and let him handle transitions
  this.render(hbs `
    {{#my-component as |editMode|}}
      {{#if editMode}}
        <p>Editable Yield</p>
      {{else}}
        <p>Normal Yield</p>
      {{/if}}
    {{/my-component}}
  `);

  assert.equal(this.$('p').text().trim(), 'Normal Yield');

  this.$('button').click();

  assert.equal(this.$('p').text().trim(), 'Editable Yield');

});

tests.test-helper.js

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

setResolver(resolver);

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": true
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}