Omnipay\Common\CreditCard::getShippingFax PHP Method

    public function getShippingFax()
    {
        return $this->getParameter('shippingFax');
    }

 public function testFax()
 {
     $this->card->setFax('54321');
     $this->assertEquals('54321', $this->card->getFax());
     $this->assertEquals('54321', $this->card->getBillingFax());
     $this->assertEquals('54321', $this->card->getShippingFax());
 }