--- /dev/null
+<?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\Routing\Tests\Matcher\Dumper;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Routing\Matcher\Dumper\DumperCollection;
+
+class DumperCollectionTest extends TestCase
+{
+ public function testGetRoot()
+ {
+ $a = new DumperCollection();
+
+ $b = new DumperCollection();
+ $a->add($b);
+
+ $c = new DumperCollection();
+ $b->add($c);
+
+ $d = new DumperCollection();
+ $c->add($d);
+
+ $this->assertSame($a, $c->getRoot());
+ }
+}