Ember Conucrrency perform helper vs Qunit

controllers.application\.js

import Controller from '@ember/controller';
import { task } from 'ember-concurrency';
import { waitFor } from '@ember/test-waiters';

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

  @waitFor
	reject() {
    return new Promise((resolve, reject) => reject(new Error('SHOOP DA WHOOP!')));
  }

	@task
  *submitTask() {
    return yield this.reject();
  }
}

templates.application\.hbs

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

{{#if this.submitTask.isLoading}}
  <p id="loading">
    Loading...
  </p>
{{else if this.submitTask.last.isError}}
  <p id="error">
    Something wrong happened:
    {{this.submitTask.last.error.message}}
  </p>
{{/if}}

<button
	{{on "click" (perform this.submitTask)}}
>
  Submit
</button>

tests.acceptance.my-acceptance-test\.js

import { module, test } from 'qunit';
import { visit, currentURL, click, find } from '@ember/test-helpers';
import { setupApplicationTest } from 'ember-qunit';
import { setupOnerror, resetOnerror } from '@ember/test-helpers';


module('TODO: put something here', function(hooks) {
  setupApplicationTest(hooks);
  
  hooks.beforeEach(() => {
    setupOnerror((error) => {});
  });
  
  hooks.afterEach(() => {
    resetOnerror();
  });

  test('QUnit and a rejected promise', async function(assert) {
    await visit('/');
    await click('button');
    assert.ok(find('#error'));
  });
});

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": "0.17.1",
  "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/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "ember-concurrency": "2.1.2",
    "@ember/test-helpers": "2.3.0",
    "@ember/test-waiters": "2.4.5"
  }
}