splattributes button type

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

templates.application\.hbs

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

templates.components.my-action\.hbs

<button type="button" class="link-button" ...attributes>
  {{yield}}
</button>

tests.integration.components.my-action-test\.js

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

module('Integration | Component | my-action', function(hooks) {
  setupRenderingTest(hooks);

  test('it is a button type="button"', async function(assert) {
    await render(hbs`
      <MyAction>
        template block text
      </MyAction>
    `);
    
    let button = this.element.querySelector('.link-button');
    assert.equal(button.textContent.trim(), 'template block text', 'it has the block text');
    assert.equal(button.type, 'button', 'it has `type="button"`');
  });
  
  test('the button type can be overridden', async function(assert) {
    await render(hbs`
      <MyAction type="submit">
        template block text
      </MyAction>
    `);
    
    let button = this.element.querySelector('.link-button');
    assert.equal(button.type, 'submit', 'it has `type="submit"`');
  });
});

tests.test-helper\.js

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

let attributes = {
  rootElement: '#test-root',
  autoboot: false
};
attributes = assign(attributes, config.APP);

let application = Application.create(attributes);
setApplication(application);

start();

twiddle\.json

{
  "version": "0.17.0",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": true
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.17.0",
    "ember-template-compiler": "3.17.0",
    "ember-testing": "3.17.0"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}