test.js

        ,'do_tagging_comparison_add': function (product) {
            // safely handle global objects and nested data lookups
            if (_.isUndefined( window.fossilTrack ) ){
                // break out
                return;
            }
            // do tag
            window.fossilTrack('compare_addition', {
                site: {
                    'productID': product.code,
                    'name': product.name,
                    'brand':'fossil',
                    'inventory':product.inventory,
                    'sku':product.sku

                },
                checkout: {
                    type: 'paypal',
                    paypalLocation: ['cart']
                }
            });
        }