public function testXmlResponse()
{
$response = array();
$response['ResponseBody'] = '<GetOrderReferenceDetailsResponse xmlns="http://mws.amazonservices.com/schema/OffAmazonPayments/2013-01-01">
<AmazonOrderReferenceId>S01-5806490-2147504</AmazonOrderReferenceId>
<ExpirationTimestamp>2015-09-27T02:18:33.408Z</ExpirationTimestamp>
<SellerNote>This is testing API call</SellerNote>
</GetOrderReferenceDetailsResponse>';
$responseObj = new ResponseParser($response);
$xmlResponse = $responseObj->toXml();
$this->assertEquals($xmlResponse, $response['ResponseBody']);
}