Fix layout xml and page layout caching issue on redis cluster under high load

-Fixed static tests

Author: xmav

lib/internal/Magento/Framework/View/Test/Unit/Model/Layout/MergeTest.php

@@ -11,6 +11,11 @@
 use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;
 use Magento\Framework\View\Layout\LayoutCacheKeyInterface;
 
+/**
+ * Class MergeTest
+ *
+ * @package Magento\Framework\View\Test\Unit\Model\Layout
+ */
 class MergeTest extends \PHPUnit\Framework\TestCase
 {
     /**