N°2651 rollback gitignore for lib tests dirs

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

lib/symfony/framework-bundle/Tests/Kernel/MicroKernelTraitTest.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\Bundle\FrameworkBundle\Tests\Kernel;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\HttpFoundation\Request;
+
+class MicroKernelTraitTest extends TestCase
+{
+    public function test()
+    {
+        $kernel = new ConcreteMicroKernel('test', false);
+        $kernel->boot();
+
+        $request = Request::create('/');
+        $response = $kernel->handle($request);
+
+        $this->assertEquals('halloween', $response->getContent());
+        $this->assertEquals('Have a great day!', $kernel->getContainer()->getParameter('halloween'));
+        $this->assertInstanceOf('stdClass', $kernel->getContainer()->get('halloween'));
+    }
+
+    public function testAsEventSubscriber()
+    {
+        $kernel = new ConcreteMicroKernel('test', false);
+        $kernel->boot();
+
+        $request = Request::create('/danger');
+        $response = $kernel->handle($request);
+
+        $this->assertSame('It\'s dangerous to go alone. Take this ⚔', $response->getContent());
+    }
+}