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vendor/symfony/twig-bundle/Tests/DependencyInjection/ConfigurationTest.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\Bundle\TwigBundle\Tests\DependencyInjection;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Bundle\TwigBundle\DependencyInjection\Configuration;
+use Symfony\Component\Config\Definition\Processor;
+
+class ConfigurationTest extends TestCase
+{
+    public function testDoNoDuplicateDefaultFormResources()
+    {
+        $input = array(
+            'form_themes' => array('form_div_layout.html.twig'),
+        );
+
+        $processor = new Processor();
+        $config = $processor->processConfiguration(new Configuration(), array($input));
+
+        $this->assertEquals(array('form_div_layout.html.twig'), $config['form_themes']);
+    }
+}