N°2651 rollback gitignore for lib tests dirs

Too dangerous ! We'll work properly on this but for 2.8

lib/symfony/http-kernel/Tests/Fixtures/KernelForTest.php

@@ -0,0 +1,42 @@
+<?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\HttpKernel\Tests\Fixtures;
+
+use Symfony\Component\Config\Loader\LoaderInterface;
+use Symfony\Component\HttpKernel\Kernel;
+
+class KernelForTest extends Kernel
+{
+    public function getBundleMap()
+    {
+        return $this->bundleMap;
+    }
+
+    public function registerBundles()
+    {
+        return [];
+    }
+
+    public function registerContainerConfiguration(LoaderInterface $loader)
+    {
+    }
+
+    public function isBooted()
+    {
+        return $this->booted;
+    }
+
+    public function getProjectDir()
+    {
+        return __DIR__;
+    }
+}