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/Event/GetResponseForExceptionEventTest.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\HttpKernel\Tests\Event;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
+use Symfony\Component\HttpKernel\Tests\TestHttpKernel;
+
+class GetResponseForExceptionEventTest extends TestCase
+{
+    public function testAllowSuccessfulResponseIsFalseByDefault()
+    {
+        $event = new GetResponseForExceptionEvent(new TestHttpKernel(), new Request(), 1, new \Exception());
+
+        $this->assertFalse($event->isAllowingCustomResponseCode());
+    }
+}