Constructive description here

vendor/symfony/http-kernel/Tests/Fixtures/TestEventDispatcher.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpKernel\Tests\Fixtures;
+
+use Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcherInterface;
+use Symfony\Component\EventDispatcher\EventDispatcher;
+
+class TestEventDispatcher extends EventDispatcher implements TraceableEventDispatcherInterface
+{
+    public function getCalledListeners()
+    {
+        return array('foo');
+    }
+
+    public function getNotCalledListeners()
+    {
+        return array('bar');
+    }
+}