N°2651 rollback gitignore for lib tests dirs

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

lib/symfony/cache/Tests/Fixtures/ArrayCache.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace Symfony\Component\Cache\Tests\Fixtures;
+
+use Doctrine\Common\Cache\CacheProvider;
+
+class ArrayCache extends CacheProvider
+{
+    private $data = [];
+
+    protected function doFetch($id)
+    {
+        return $this->doContains($id) ? $this->data[$id][0] : false;
+    }
+
+    protected function doContains($id)
+    {
+        if (!isset($this->data[$id])) {
+            return false;
+        }
+
+        $expiry = $this->data[$id][1];
+
+        return !$expiry || time() < $expiry || !$this->doDelete($id);
+    }
+
+    protected function doSave($id, $data, $lifeTime = 0)
+    {
+        $this->data[$id] = [$data, $lifeTime ? time() + $lifeTime : false];
+
+        return true;
+    }
+
+    protected function doDelete($id)
+    {
+        unset($this->data[$id]);
+
+        return true;
+    }
+
+    protected function doFlush()
+    {
+        $this->data = [];
+
+        return true;
+    }
+
+    protected function doGetStats()
+    {
+        return null;
+    }
+}