fix integration tests

Author: ilnytskyi

app/code/Magento/Catalog/Model/ResourceModel/Category.php

@@ -36,8 +36,6 @@ class Category extends AbstractResource
     protected $_tree;
 
     /**
-     * Catalog products table name
-     *
      * @var string
      */
     protected $_categoryProductTable;
@@ -48,15 +46,11 @@ class Category extends AbstractResource
     private $entitiesWhereAttributesIs;
 
     /**
-     * Id of 'is_active' category attribute
-     *
      * @var int
      */
     protected $_isActiveAttributeId = null;
 
     /**
-     * Id of store
-     *
      * @var int
      */
     protected $_storeId = null;
@@ -454,7 +448,7 @@ protected function _saveCategoryProducts($category)
                     'position' => (int)$position,
                 ];
             }
-            $connection->insertMultiple($this->getCategoryProductTable(), $data);
+            $connection->insertOnDuplicate($this->getCategoryProductTable(), $data, ['position']);
         }
 
         /**