TraceableEventDispatcher example

use Symfony\Component\HttpKernel\Controller\ArgumentResolverInterface;
use Symfony\Component\HttpKernel\Controller\ControllerResolverInterface;
use Symfony\Component\HttpKernel\Debug\TraceableEventDispatcher;
use Symfony\Component\HttpKernel\HttpKernel;
use Symfony\Component\Stopwatch\Stopwatch;
use Symfony\Contracts\EventDispatcher\Event;

class TraceableEventDispatcherTest extends TestCase
{
    public function testStopwatchSections()
    {
        $dispatcher = new TraceableEventDispatcher(new EventDispatcher(), $stopwatch = new Stopwatch());
        $kernel = $this->getHttpKernel($dispatcher);
        $request = Request::create('/');
        $response = $kernel->handle($request);
        $kernel->terminate($request, $response);

        $events = $stopwatch->getSectionEvents($request->attributes->get('_stopwatch_token'));
        $this->assertEquals([
            '__section__',
            'kernel.request',
            'kernel.controller',
            'kernel.controller_arguments',
            

use Symfony\Component\EventDispatcher\EventDispatcher;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Stopwatch\Stopwatch;
use Symfony\Contracts\EventDispatcher\Event;

class TraceableEventDispatcherTest extends TestCase
{
    public function testAddRemoveListener()
    {
        $dispatcher = new EventDispatcher();
        $tdispatcher = new TraceableEventDispatcher($dispatcher, new Stopwatch());

        $tdispatcher->addListener('foo', $listener = function D) {});
        $listeners = $dispatcher->getListeners('foo');
        $this->assertCount(1, $listeners);
        $this->assertSame($listener, $listeners[0]);

        $tdispatcher->removeListener('foo', $listener);
        $this->assertCount(0, $dispatcher->getListeners('foo'));
    }

    public function testGetListeners()
    {