Integration tests - renderWithDefaults

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
});

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
  name="joe doe"
  greeting="Hi"
  number=7
}}

<hr>

templates.components.my-component.hbs

<p class="foo">{{foo}}</p>
<p class="bar">{{bar}}</p>

<p class="greeting">{{greeting}} {{name}}.</p>
<p class="number">Your number is {{number}}</p>

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

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

/**
 * Renders component with default and optional props.
 *
 * @param context The test context
 * @param options Additional props
 */
function renderWithDefaults(context, options = {}) {
  const defaults = { foo: 'Hi from foo', bar: 'Hi from bar' };
  const props = Object.assign(defaults, options);
  
  context.setProperties(props);
  
  const attrs = Object.keys(props).reduce((acc, key) => {
    return `${acc} ${key}=${key}`;
  }, '');
  
  const componentDef = `{{my-component ${attrs}}}`;
  
  // Error: placeholders inside a tagged template string are not supported
  // context.render(hbs`${componentDef}`);
  context.render(componentDef);
}

moduleForComponent('my-component', 'Integration | Component | my-component', {
  integration: true
});

// Test with only default props
test('it shows foo', function(assert) {
  renderWithDefaults(this);
  assert.equal(this.$('.foo').text().trim(), 'Hi from foo');
});

// Test with some default props overriden
test('it shows bar', function(assert) {
  renderWithDefaults(this, { bar: 'Hi from the bar' });
  assert.equal(this.$('.bar').text().trim(), 'Hi from the bar');
});

// Test with optional props
test('it shows greeting', function(assert) {
  renderWithDefaults(this, {
    name: 'Alice',
    greeting: 'Hello',
  });
  
  assert.equal(this.$('.greeting').text().trim(), 'Hello Alice.');
});

// Test with optional prop
test('it shows number', function(assert) {
  renderWithDefaults(this, { number: 3 });
  assert.equal(this.$('.number').text().trim(), 'Your number is 3');
});

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"
  }
}