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vendor/symfony/dependency-injection/Tests/ReferenceTest.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\DependencyInjection\Tests;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\Reference;
+
+class ReferenceTest extends TestCase
+{
+    public function testConstructor()
+    {
+        $ref = new Reference('foo');
+        $this->assertEquals('foo', (string) $ref, '__construct() sets the id of the reference, which is used for the __toString() method');
+    }
+}