Braintree submit for settlement in sandbox

I created a simple testscript in NodeJS for creating transactions with the Braintree SDK. However, whenever I try to use a fake failing nonce, it just succeeds. I am sure I am missing something simple here, but I can not figure out what it is.

gateway.transaction.sale({
    amount: 10,
    paymentMethodNonce: "fake-processor-declined-mastercard-nonce",
    options: {
        submitForSettlement: true
    }
}, function(err, res) {
    console.log(JSON.stringify(res, null, "\t"));
});

_{Full disclosure: I work for Braintree.}

The fake-processor-declined nonces don't simulate failed transactions, but failed credit card verifications. Enable card verification in the Braintree control panel by going to Settings > Processing > Card Verification. Then, make your options hash look like this: ​

  options: {
    submitForSettlement: true,
    verifyCard: true
  }

​ The transaction will no longer succeed and will return an authorization error. ​

If you are trying to simulate a failed transaction, use a specific test transaction amount with fake-valid-nonce instead.

If you have any additional questions, feel free to reach out to Braintree support.