MAGETWO-92883: Category hierarchy isn't updated on Product Admin page

Author: svitja

app/code/Magento/Catalog/Test/Unit/Controller/Adminhtml/Category/RefreshPathTest.php

@@ -64,7 +64,7 @@ private function setObjectProperty($object, string $propertyName, $value)
     /**
      * @return void
      */
-    public function testExecute()
+    public function testExecute() : void
     {
         $value = ['id' => 3, 'path' => '1/2/3', 'parentId' => 2];
         $result = '{"id":3,"path":"1/2/3","parentId":"2"}';
@@ -116,7 +116,7 @@ public function testExecute()
     /**
      * @return void
      */
-    public function testExecuteWithoutCategoryId()
+    public function testExecuteWithoutCategoryId() : void
     {
         $requestMock = $this->getMockForAbstractClass(\Magento\Framework\App\RequestInterface::class);