Omnipay\Common\CreditCardTest::testPhoneExtension PHP Method

    public function testPhoneExtension()
    {
        $this->card->setPhoneExtension('001');
        $this->assertEquals('001', $this->card->getPhoneExtension());
        $this->assertEquals('001', $this->card->getBillingPhoneExtension());
        $this->assertEquals('001', $this->card->getShippingPhoneExtension());
    }