public function testPurchaseNoMessageNoResponseCode()
 {
     $httpResponse = $this->getMockHttpResponse('NoMessageNoResponseCodeFailure.txt');
     $response = new PurchaseResponse($this->getMockRequest(), $httpResponse->xml());
     $this->assertNull($response->getMessage());
     $this->assertNull($response->getResponseCode());
 }
 public function testPurchaseFailure()
 {
     $httpResponse = $this->getMockHttpResponse('PurchaseRequestFailure.txt');
     $response = new PurchaseResponse($this->getMockRequest(), $httpResponse->xml());
     $this->assertFalse($response->isSuccessful());
     $this->assertSame('Valid Format', $response->getMessage());
     $this->assertSame('1', $response->getResponseCode());
     $this->assertNull($response->getTransactionReference());
     $this->assertNull($response->getOrderId());
     $this->assertNull($response->getAuthCode());
     $this->assertNull($response->getCardValidationResult());
     $this->assertNull($response->getAvsResult());
 }