public function testOrderFulfillmentByCarrierName()
 {
     $xml = new \XMLWriter();
     $xml->openMemory();
     $xml->setIndent(true);
     $f = new OrderFulfillment($xml);
     $f->setMerchantOrderId(123)->setCarrierName('UPS')->setFulfillmentDate(new \DateTime('2000-01-01T00:00:00-06:00'))->setMerchantFulfillmentId(123)->setShipperTrackingNumber('1Z0')->setShippingMethod('Ground');
     $f->writeXml();
     $dom = new \DOMDocument();
     $dom->loadXML($xml->outputMemory(true));
     $this->assertTrue($dom->schemaValidate(__DIR__ . '/../../../XSD/Fulfillment.xsd'));
 }