Fix compatibility with Magento\ImportExport module

Author: lbajsarowicz

app/code/Magento/CatalogImportExport/Test/Unit/Model/Import/Product/Type/OptionTest.php

@@ -5,6 +5,8 @@
  */
 namespace Magento\CatalogImportExport\Test\Unit\Model\Import\Product\Type;
 
+use PHPUnit\Framework\MockObject\MockObject;
+
 /**
  * Test class for import product options module
  * @SuppressWarnings(PHPMD.TooManyFields)
@@ -506,7 +508,7 @@ public function iterate(\Magento\Framework\Data\Collection\AbstractDb $collectio
     /**
      * Get new object mock for \Magento\Catalog\Model\Product\Option
      *
-     * @return \Magento\Catalog\Model\Product\Option|\PHPUnit_Framework_MockObject_MockObject
+     * @return \Magento\Catalog\Model\Product\Option|MockObject
      */
     public function getNewOptionMock()
     {