N°2651 rollback gitignore for lib tests dirs

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

lib/symfony/config/Tests/Resource/ResourceStub.php

@@ -0,0 +1,34 @@
+<?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\Config\Tests\Resource;
+
+use Symfony\Component\Config\Resource\SelfCheckingResourceInterface;
+
+class ResourceStub implements SelfCheckingResourceInterface
+{
+    private $fresh = true;
+
+    public function setFresh($isFresh)
+    {
+        $this->fresh = $isFresh;
+    }
+
+    public function __toString()
+    {
+        return 'stub';
+    }
+
+    public function isFresh($timestamp)
+    {
+        return $this->fresh;
+    }
+}