public function setUp()
 {
     $this->gateway = new \Omnipay\PaymentWall\Gateway();
     $gateway = $this->gateway;
     $this->card = new CreditCard($this->getValidCard());
     $this->card->setStartMonth(1);
     $this->card->setStartYear(2000);
     $this->request = new VoidRequest($this->getHttpClient(), $this->getHttpRequest());
     $this->request->initialize(array('transactionReference' => 'ASDF1234', 'publicKey' => 'asdfasdf', 'privateKey' => 'asdfasdf', 'clientIp' => '127.0.0.1', 'browserDomain' => 'PairMeUp'));
     // Sample response data for testing
     $data = array('success' => true, 'id' => 1234, 'card' => array('token' => 'qwerty12341234'), 'error' => 'The quick brown fox', 'code' => 200);
     $this->response = new Response($this->request, $data, 200);
 }