New Twiddle

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  
  didReceiveAttrs() {
    Ember.assert('Must be `true`', this.isTrue);
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.components.my-component.hbs

{{yield}}

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 fails', function(assert) {
  // Template block usage:
  try {
    this.render(hbs`
      {{#my-component}}
        template block text
      {{/my-component}}
    `);
  } catch (e) {
        console.log('eeeee');
    console.log(e);
  	assert.throws()
  }

  
});


// import { module, test } from 'qunit';
// import { setupRenderingTest } from 'ember-qunit';
// import { render } from '@ember/test-helpers';
// import hbs from 'htmlbars-inline-precompile';

// module('MyComponent', 'Integration | Component | MyComponent', function(hooks) {
//   setupRenderingTest(hooks);

//   test('it passes', async function(assert) {
//     await render(hbs`<MyComponent @isTrue={{true}} />`);
//   });
  
//   test('it fails', async function(assert) {
//     await render(hbs`<MyComponent @isTrue={{false}} />`);
//   });
  
// });

tests.test-helper.js

import Application from '../app';
import config from '../config/environment';
import { setApplication } from '@ember/test-helpers';
import { start } from 'ember-qunit';
import { assign } from '@ember/polyfills';

let attributes = assign({ rootElement: '#main' }, config.APP);
setApplication(Application.create(attributes));

start();

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": true
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}