Testing component initialisation and required arguments in Ember 3.15 (Octane)

app_components_throw-test.js

import Component from '@glimmer/component';

export default class ThrowTestComponent extends Component {
  constructor() {
    super(...arguments)
    if (!this.args.test) {
      throw new Error('hello')
    }
  }
}

tests_integration_components_throw-test-test.js

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

module('Integration | Component | throw-test', function(hooks) {
  setupRenderingTest(hooks);

  test('integration style: it works with an argument', async function(assert) {
    await render(hbs`<ThrowTest @test="123"/>`);
    assert.ok(true)
  });

  // Can't get this one to work. Send help.
  skip('integration style: it fails without an argument', async function(assert) {
    assert.expect(1)
    await render(hbs`<ThrowTest/>`);
  });
});

tests_unit_components_throw-test-test.js

import { module, test } from 'qunit';
import { setupTest } from 'ember-qunit';


// Adapted from https://timgthomas.com/2019/11/unit-testing-glimmer-components/
// Without it, Glimmer won't let me instanciate components with simple `new MyComponent(...)`
//
// START
import GlimmerComponentManager from 'hey/component-managers/glimmer';

export default function createComponent(owner, lookupPath, named = {}) {
  let { class: componentClass } = owner.factoryFor(lookupPath);
  let componentManager = new GlimmerComponentManager(owner);
  return componentManager.createComponent(componentClass, { named });
}
//END


module('Unit | Component | throw-test', function(hooks) {
  setupTest(hooks);

  test('unit style: it works with an argument', async function(assert) {
    /* let component = */ createComponent(this.owner, 'component:throw-test', { test: 'hello' })
    assert.ok(true, 'it worked')
  });

  test('unit style: it fails without an argument', async function(assert) {
    try {
      /* let component = */ createComponent(this.owner, 'component:throw-test', {})
    } catch(e) {
      assert.ok(true, 'it did not render')
    }
  });
});