Omnipay\Common\CreditCardTest::testBillingPhoneExtension PHP Method

    public function testBillingPhoneExtension()
    {
        $this->card->setBillingPhoneExtension('001');
        $this->assertSame('001', $this->card->getBillingPhoneExtension());
        $this->assertSame('001', $this->card->getPhoneExtension());
    }