Lightweight Javascript testing tool

DG_tester

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
jQuery.cookie = function(name, value, options) {
	// @author Klaus Hartl/[email protected]
    if (typeof value != 'undefined') {
        options = options || {};
        if (value === null) {
            value = '';
            options.expires = -1;
        }
        var expires = '';
        if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
            var date;
            if (typeof options.expires == 'number') {
                date = new Date();
                date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
            } else {
                date = options.expires;
            }
            expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
        }
        var path = options.path ? '; path=' + (options.path) : '';
        var domain = options.domain ? '; domain=' + (options.domain) : '';
        var secure = options.secure ? '; secure' : '';
        document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
    } else { // only name given, get cookie
        var cookieValue = null;
        if (document.cookie && document.cookie != '') {
            var cookies = document.cookie.split(';');
            for (var i = 0; i < cookies.length; i++) {
                var cookie = jQuery.trim(cookies[i]);
                // Does this cookie string begin with the name we want?
                if (cookie.substring(0, name.length + 1) == (name + '=')) {
                    cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                    break;
                }
            }
        }
        return cookieValue;
    }
};

var DG_tester = (function(jQuery) {
	// @author Drew Gillson/[email protected]
	var my = {};
	var endpoint = '//yourdomain.com/endpoint/';
	var expires = 7;
	
	my.assignAlpha = function(idx) {
		return "ABCDEF"[(idx-1)];
	}
	
	my.score = function(testId) {
		var callback = jQuery.cookie(testId);
		var alpha = this.assignAlpha(callback);
		if (jQuery('#' + testId + '-score').length == 0 && jQuery.cookie(testId)) {
			jQuery('body').append('<img style="display: none;" id="' + testId + '-score" src="' + endpoint + '?testId=' + testId + '&score=' + alpha + '"/>');
		}
	}
	
	my.test = function() {
		var cookied = false;
		testId = escape(arguments[0]);
		if (jQuery.cookie(testId) == '' || !jQuery.cookie(testId)) {
			var callback = Math.floor(Math.random()*(arguments.length-1))+1;
			jQuery.cookie(testId, callback, { expires: expires });
		}
		else {
			cookied = true;
			var callback = jQuery.cookie(testId);
		}
		arguments[callback].call();
		var alpha = this.assignAlpha(callback);
		if (jQuery('#' + testId).length == 0) {
			jQuery('body').append('<img style="display: none;" id="' + testId + '" src="' + endpoint + '?testId=' + testId + '&try=' + alpha + '"/>');
		}
	}
	
	return my;
	
}(jQuery));
</script>

Example

<script type="text/javascript">
jQuery(document).ready(function() {
	DG_tester.test(
		'red_or_green',
		function() {
			jQuery('#color').css('background-color','green');
		},
		function() {
			jQuery('#color').css('background-color','red');
		}
	);	
});
</script>

<div id="color">The background of this div will change color.</div>

Score

jQuery('#add-to-cart').click(function() {
	DG_tester.score('red_or_green');
});