testcase update

Author: vishalverma.magento279

app/code/Magento/Dhl/Test/Unit/Model/CarrierTest.php

@@ -332,6 +332,7 @@ public function dhlProductsDataProvider(): array
                     'H' => 'Economy select',
                     'J' => 'Jumbo box',
                     'M' => 'Express 10:30',
+                    'N' => 'Domestic express',
                     'V' => 'Europack',
                     'Y' => 'Express 12:00',
                 ],