test.js

define([
    'intern!object',
    'intern/chai!assert',
    'require'
], function (registerSuite, assert, require) {

    function getScrollPosition(context) {
        return context.remote
          .execute(function () {
            y = window.pageYOffset;
            return y;
          });
    }

    registerSuite({

        name: 'scrollupdate',

        'scroll updates on navigation click' : function() {

            var linkToCheck = 'about';

            console.log(getScrollPosition(this));
        }
    });
});