run via `casper test index.js`

index.js

var base = 'http://m.retailmenot.test';
var url = base + '/view/macys.com';

function getCookie (page, name) {
    var cookies = page.cookies;
    var val;
    cookies.forEach(function (cookie) {
        if (cookie.name === name) {
            val = cookie.value;
        }
    });
    return val;
};
var page1, page2, success, id,
    ufv = [],
    sliceCookie = [];


casper.test.begin(
    'Cookies did not change across pages', function(test) {

        casper.userAgent('iphone');

        casper.start(url, function() {
            ufv.push(getCookie(this.page, 'userFlashVersion'));
            sliceCookie.push(getCookie(this.page, 'slice'));
            /*page1 = 'Slice: ' +
             getCookie(this.page, 'slice') +
             ' url: ' + this.getCurrentUrl() +
             ' userid: ' +
             getCookie(this.page, 'userFlashVersion');*/
        });

        casper.then(function(){
            id = this.evaluate(function(){
                $(".js-offer").eq(0).trigger('tap');
                $(".js-bad-touch span").eq(0).trigger('click');
                return $(".js-bad-touch").data('offer-id');
            });
            if (id) {
                success = true;
            }

        });

        casper.then(function(){

            casper.thenOpen(base + '/showcoupon/' + id, function(){
                console.log('oc_slice: ' + getCookie(this.page, 'oc_slice'));
                ufv.push(getCookie(this.page, 'userFlashVersion'));
                sliceCookie.push(getCookie(this.page, 'slice'));

                test.assertEquals(ufv[0], ufv[1], 'userFlashVersion matches');
                test.assertEquals(sliceCookie[0], sliceCookie[1], 'slice matches');
            });

        });

        casper.run(function(){
                console.log(getCookie(this.page, 'oc_slice'));

            test.done();
        });

    });