casperjs - multiple user log-in sequence

gistfile1.js

var casper = require('casper').create()

var colorizer = require('colorizer').create('Colorizer');

// casper.userAgent('Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)'); 
 
var userNames = ['username1','username2','username3','username4', 'username5'];

var passWords = ['password1','password2','password3','password4', 'password5'];
 
var url = 'http://mywebsitenet.com';

var tracker = {Success: [], Fail: []};
 
function login(username, password) {
	casper.then(function () {
		this.sendKeys('#log', username);
		this.sendKeys('#pwd', password);
		this.click('#wpmem_login > form > fieldset > div.button_div > input.buttons');
//		console.log(username + " has clicked the Log In button!")
	});
 
	//Step 1 (of many; starting with just this one)
	casper.waitFor(function check() {
	    return this.evaluate(function() {
	        return document.getElementById('logo');
	    });
	}, function then() {    // step to execute when check() is ok
	    this.click('#post-369 > article > div > div:nth-child(9) > div:nth-child(2) > p > a:nth-child(19)');
	}, function timeout() { // step to execute if check has failed
		tracker.Fail.push(username)
		this.echo("Warning: " + username + " could not be logged in.", "WARNING");
		this.capture('Fail_'+username+'.png');
	},10000);
	
	//Step to Log Out
	casper.waitFor(function check() {
	    return this.evaluate(function() {
	        return document.getElementById('wp-admin-bar-logout');
	    });
	}, function then() {
		this.click('#wp-admin-bar-logout > a'); 
		tracker.Success.push(username);
		//If user can log out, then they successfully logged in
		this.echo(this.fetchText('#wp-admin-bar-my-account > a') + " you logged in."); 
		this.capture('Success_'+username+'.png');
	});
};

 
casper.start(); // empty page
 
casper.viewport(1024, 768);
 
userNames.forEach(function(username, index){
    casper.thenOpen(url); // open the start page
    login(username, passWords[index]); // schedule the steps
});

casper.then(function () {
			this.echo("Success: " + tracker.Success.length, "INFO");
			this.echo("Fail: " + tracker.Fail.length, "WARNING");
			this.echo(JSON.stringify(tracker));
		});

casper.run(); // begin the execution