Add Composer autoloading functions and PHPStan for testing

vendor/symfony/console/Tests/Fixtures/DescriptorApplicationMbString.php

@@ -0,0 +1,24 @@
+<?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\Fixtures;
+
+use Symfony\Component\Console\Application;
+
+class DescriptorApplicationMbString extends Application
+{
+    public function __construct()
+    {
+        parent::__construct('MbString åpplicätion');
+
+        $this->add(new DescriptorCommandMbString());
+    }
+}