function testCreateSignature()
 {
     $expected = array('customerId', 'paymentMethodNonce', 'token', 'billingAddressId', array('options' => array('makeDefault', 'verifyCard', 'failOnDuplicatePaymentMethod', 'verificationMerchantAccountId')), array('billingAddress' => Braintree_Address::createSignature()));
     $this->assertEquals($expected, Braintree_PaymentMethod::CreateSignature());
 }