public function testGetBrandMasterCard()
{
$card = new CreditCard(array('number' => '5555555555554444'));
$this->assertSame(CreditCard::BRAND_MASTERCARD, $card->getBrand());
$card = new CreditCard(array('number' => '2230000010000006'));
$this->assertSame(CreditCard::BRAND_MASTERCARD, $card->getBrand());
$card = new CreditCard(array('number' => '6771890000000008'));
$this->assertSame(CreditCard::BRAND_MASTERCARD, $card->getBrand());
}