gistfile1.js

var zombie = require("zombie");
var assert = require("assert");

// Load the page from localhost                                                                                                                                                    
zombie.visit("http://localhost:3000/", function (err, browser, status) {

        // Fill email, password and submit form                                                                                                                                    
        browser.
            fill("session[email]", "[email protected]").
            fill("session[password]", "123456").
            pressButton("Sign in", function(err, browser, status) {
      	            console.log(browser.html());
                })
            });