CasperJS Test File - iterating through a Data Object specifying multiple viewports for each page

config.js

module.exports = {
	clientScripts : [
		'./node_modules/jquery/dist/jquery.min.js',
		'./node_modules/lodash/index.js'
	],
	viewportSize : {
		width: 1600, 
		height: 1200
	},
	timeout : 50000,
	// verbose: true,
    // logLevel: 'debug'
};

package.json

{
  "name": "casper-tests",
  "version": "0.0.0",
  "description": "",
  "main": "start.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Richard Gaunt",
  "license": "ISC",
  "dependencies": {
    "jquery": "^2.1.4",
    "lodash" : "*",
    "spooky": "^0.2.5"
  }
}

pageData.js

var defaultViewports = [
	{
		width : 320,
		height : 480
	}, 
	{
		width: 1024,
		height: 768
	}, 
	{
		width: 1600, 
		height: 1200
	}
];
module.exports = [
	{ 
		url : 'http://www.richardgaunt.com',
		viewports : defaultViewports
	},
	{
		url :'http://www.alfresco.com',
		viewports : defaultViewports
	}
];

start.js

var config = require('./config');
var pages = require('./pageData');

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

casper.start();

casper.eachThen(pages, function (response) {
	var url = response.data.url;
	var viewports = response.data.viewports;
	casper.eachThen(viewports, function (res) {
		var viewport = res.data;
		casper.thenOpen(url, function (response) {
			console.log(url + ' - ' +  viewport.width + 'x' + viewport.height);
		});
	});
});

casper.run();