title: Braintree submit for settlement in sandbox
body: <p>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.</p>
  
  <pre><code>gateway.transaction.sale({
      amount: 10,
      paymentMethodNonce: "fake-processor-declined-mastercard-nonce",
      options: {
          submitForSettlement: true
      }
  }, function(err, res) {
      console.log(JSON.stringify(res, null, "\t"));
  });
  </code></pre>