Omnipay\Common\CreditCard::getBillingCountry PHP Method

    public function getBillingCountry()
    {
        return $this->getParameter('billingCountry');
    }

 public function testCountry()
 {
     $this->card->setCountry('US');
     $this->assertEquals('US', $this->card->getCountry());
     $this->assertEquals('US', $this->card->getBillingCountry());
     $this->assertEquals('US', $this->card->getShippingCountry());
 }