MAGETWO-45086: Error during product import with Replace behavior

Author: kandy

dev/tests/integration/testsuite/Magento/ImportExport/Controller/Adminhtml/Import/ValidateTest.php

@@ -26,7 +26,7 @@ public function testFieldStateAfterValidation()
         $formKey = $this->_objectManager->get('Magento\Framework\Data\Form\FormKey');
         $this->getRequest()->setPostValue('form_key', $formKey->getFormKey());
         $this->getRequest()->setPostValue('entity', 'catalog_product');
-        $this->getRequest()->setPostValue('behavior', 'replace');
+        $this->getRequest()->setPostValue('behavior', 'append');
         $this->getRequest()->setPostValue('_import_field_separator', ',');