Add Composer autoloading functions and PHPStan for testing

vendor/symfony/console/Tests/Descriptor/XmlDescriptorTest.php

@@ -0,0 +1,27 @@
+<?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\Console\Tests\Descriptor;
+
+use Symfony\Component\Console\Descriptor\XmlDescriptor;
+
+class XmlDescriptorTest extends AbstractDescriptorTest
+{
+    protected function getDescriptor()
+    {
+        return new XmlDescriptor();
+    }
+
+    protected function getFormat()
+    {
+        return 'xml';
+    }
+}