improvements-2.x-dev/modules/improvements_contact/tests/modules/improvements_contact_test/src/Controller/ImprovementsContactTestController.php

<?php

namespace Drupal\improvements_contact_test\Controller;

use Drupal\contact\ContactFormInterface;
use Drupal\Core\Controller\ControllerBase;

class ImprovementsContactTestController extends ControllerBase {

  public function contactForm(ContactFormInterface $contact_form): array {
    return improvements_contact_get_message_form($contact_form->id());
  }

}