Mocha Zombie exception thrown on 401 status code

statusCodes.js

var expect = require('expect.js'),
Browser = require('zombie');

var browser = new Browser({waitDuration: 1500});

describe('Status Codes', function(){
    this.timeout(2000);

    it('Unauthorized', function(done){

        browser.visit("http://status.savanttools.com/?code=401%20Unauthorized").then(function () {

            expect(browser.statusCode).to.equal(401);
           
            done();
        }).fail(function(e){
            if(browser.statusCode == 401){
                return done();
            }
            console.log("Error Thrown: ");
            console.log(e);
            console.log("Status Code: " + browser.statusCode);
            done(e);
        });
    });
});