MAGETWO-50768: [PageCache] Category does not appear on Home Page

app/code/Magento/Catalog/Plugin/Block/Topmenu.php

@@ -63,6 +63,7 @@ class Topmenu
      * @param string $outermostClass
      * @param string $childrenWrapClass
      * @param int $limit
+     * @return void
      * @SuppressWarnings("PMD.UnusedFormalParameter")
      */
     public function beforeGetHtml(
@@ -100,6 +101,7 @@ class Topmenu
      * Add list of associated identities to the top menu block for caching purposes.
      *
      * @param \Magento\Theme\Block\Html\Topmenu $subject
+     * @return void
      */
     public function beforeGetIdentities(\Magento\Theme\Block\Html\Topmenu $subject)
     {

app/code/Magento/Catalog/Test/Unit/Plugin/Block/TopmenuTest.php

@@ -13,7 +13,7 @@ use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;
 class TopmenuTest extends \PHPUnit_Framework_TestCase
 {
     /**
-     * @var \Magento\Catalog\Plugin\Block\TopMenu
+     * @var \Magento\Catalog\Plugin\Block\Topmenu
      */
     protected $block;
 
@@ -101,7 +101,7 @@ class TopmenuTest extends \PHPUnit_Framework_TestCase
             ->willReturn(new \ArrayIterator([]));
 
         $this->block = (new ObjectManager($this))->getObject(
-            'Magento\Catalog\Plugin\Block\TopMenu',
+            \Magento\Catalog\Plugin\Block\Topmenu::class,
             [
                 'catalogCategory' => $this->_catalogCategory,
                 'menuCategoryData' => $this->menuCategoryData,