test: add failing mastodon test (#3255)

* fix: refactor cache factory

* test: add failing test

* add null cache

caches/NullCache.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+class NullCache implements CacheInterface
+{
+    public function setScope($scope)
+    {
+    }
+
+    public function setKey($key)
+    {
+    }
+
+    public function loadData()
+    {
+    }
+
+    public function saveData($data)
+    {
+    }
+
+    public function getTime()
+    {
+    }
+
+    public function purgeCache($seconds)
+    {
+    }
+}