framework/tests/integration/extenders/EventTest.php

<?php

/*
 * This file is part of Flarum.
 *
 * For detailed copyright and license information, please view the
 * LICENSE file that was distributed with this source code.
 */

namespace Flarum\Tests\integration\extenders;

use Flarum\Extend;
use Flarum\Group\Command\CreateGroup;
use Flarum\Group\Event\Created;
use Flarum\Tests\integration\RetrievesAuthorizedUsers;
use Flarum\Tests\integration\TestCase;
use Flarum\User\User;
use Illuminate\Contracts\Bus\Dispatcher;
use Symfony\Component\Translation\TranslatorInterface;

class EventTest extends TestCase
{
    use RetrievesAuthorizedUsers;

    protected function buildGroup()
    {
        $bus = $this->app()->getContainer()->make(Dispatcher::class);

        return $bus->dispatch(
            new CreateGroup(User::find(1), ['attributes' => [
                'nameSingular' => 'test group',
                'namePlural' => 'test groups',
                'color' => '#000000',
                'icon' => 'fas fa-crown',
            ]])
        );
    }

    /**
     * @test
     */
    public function custom_listener_doesnt_work_by_default()
    {
        $group = $this->buildGroup();

        $this->assertEquals('test group', $group->name_singular);
    }

    /**
     * @test
     */
    public function custom_listener_works_with_closure()
    {
        $this->extend((new Extend\Event)->listen(Created::class, function (Created $event) {
            $event->group->name_singular = 'modified group';
        }));

        $group = $this->buildGroup();

        $this->assertEquals('modified group', $group->name_singular);
    }

    /**
     * @test
     */
    public function custom_listener_works_with_class_with_handle_method_and_can_inject_stuff()
    {
        // Because it injects a translator, this also tests that stuff can be injected into this callback.
        $this->extend((new Extend\Event)->listen(Created::class, CustomListener::class));

        $group = $this->buildGroup();

        $this->assertEquals('core.group.admin', $group->name_singular);
    }
}

class CustomListener
{
    protected $translator;

    public function __construct(TranslatorInterface $translator)
    {
        $this->translator = $translator;
    }

    public function handle(Created $event)
    {
        $event->group->name_singular = $this->translator->trans('core.group.admin');
    }
}