Fixed static test failures

Author: engcom-Echo

app/code/Magento/Sitemap/Controller/Adminhtml/Sitemap/Save.php

@@ -28,7 +28,7 @@ class Save extends Sitemap implements HttpPostActionInterface
     /**
      * Maximum length of sitemap filename
      */
-    const MAX_FILENAME_LENGTH = 32;
+    public const MAX_FILENAME_LENGTH = 32;
 
     /**
      * @var StringLength

app/code/Magento/Sitemap/Test/Unit/Controller/Adminhtml/Sitemap/DeleteTest.php

@@ -10,11 +10,9 @@
 use Magento\Backend\App\Action\Context;
 use Magento\Backend\Helper\Data;
 use Magento\Backend\Model\Session;
-use Magento\Backend\Model\View\Result\Redirect;
 use Magento\Framework\App\ActionFlag;
 use Magento\Framework\App\RequestInterface;
 use Magento\Framework\App\ResponseInterface;
-use Magento\Framework\Controller\ResultFactory;
 use Magento\Framework\Filesystem;
 use Magento\Framework\HTTP\PhpEnvironment\Request;
 use Magento\Framework\Message\ManagerInterface;
@@ -24,6 +22,9 @@
 use Magento\Sitemap\Model\SitemapFactory;
 use PHPUnit\Framework\TestCase;
 
+/**
+ * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
+ */
 class DeleteTest extends TestCase
 {
     /**