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vendor/symfony/routing/Tests/Matcher/Dumper/DumperCollectionTest.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\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());
+    }
+}