N°2651 rollback gitignore for lib tests dirs

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

lib/symfony/cache/Tests/Simple/PhpFilesCacheTest.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\Cache\Tests\Simple;
+
+use Psr\SimpleCache\CacheInterface;
+use Symfony\Component\Cache\Simple\PhpFilesCache;
+
+/**
+ * @group time-sensitive
+ */
+class PhpFilesCacheTest extends CacheTestCase
+{
+    protected $skippedTests = [
+        'testDefaultLifeTime' => 'PhpFilesCache does not allow configuring a default lifetime.',
+    ];
+
+    public function createSimpleCache()
+    {
+        if (!PhpFilesCache::isSupported()) {
+            $this->markTestSkipped('OPcache extension is not enabled.');
+        }
+
+        return new PhpFilesCache('sf-cache');
+    }
+
+    protected function isPruned(CacheInterface $cache, $name)
+    {
+        $getFileMethod = (new \ReflectionObject($cache))->getMethod('getFile');
+        $getFileMethod->setAccessible(true);
+
+        return !file_exists($getFileMethod->invoke($cache, $name));
+    }
+}