public function testDeleteCustomerFailure()
 {
     $httpResponse = $this->getMockHttpResponse('DeleteCustomerFailure.txt');
     $response = new Response($this->getMockRequest(), $httpResponse->json());
     $this->assertFalse($response->isSuccessful());
     $this->assertFalse($response->isRedirect());
     $this->assertNull($response->getTransactionReference());
     $this->assertNull($response->getCustomerReference());
     $this->assertSame('No such customer: cus_1MZeNih5LdKxDq', $response->getMessage());
 }