cou929/index.html

## index.html
<!DOCTYPE html>
<head>
  <title>Cookie restriction tester</title>
  <script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
  <script src="tester.js"></script>
</head>
<body>
  <div id="max_cookie_count_per_domain"></div>
  <div id="max_cookie_count_per_domain_warning"></div>
  <div id="ext"></div>
  <div id="ext2"></div>
</body>
</html>

## tester.js
var CookieManager = function CookieManager(doc) {
    this.doc = doc || window.document;
};

CookieManager.prototype.setItem = function setItem(key, value) {
    // value of expire is random future
    this.doc.cookie = encodeURIComponent(key) + "=" + encodeURIComponent(value) + "; expires=" + (new Date((new Date()).valueOf() + parseInt(Math.random() * 10, 10) * 50000 + 100000)).toUTCString();
};

CookieManager.prototype.getItem = function getItem(key) {
    return decodeURIComponent(this.doc.cookie.replace(new RegExp("(?:(?:^|.*;)\\s*" + encodeURIComponent(key).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=\\s*([^;]*).*$)|^.*$"), "$1")) || null;
};

CookieManager.prototype.removeItem = function removeItem(key) {
    document.cookie = encodeURIComponent(key) + "=; expires=Thu, 01 Jan 1970 00:00:00 GMT";
};

CookieManager.prototype.clear = function clear() {
    var keys = this.keys();
    for (var i = 0, key = keys[i]; key; key = keys[++i]) {
        this.removeItem(key);
    }
    if (this.count() !== 0) {
        throw "there are some cookies";
    }
};

CookieManager.prototype.count = function count() {
    if (!this.doc.cookie) return 0;
    return this.doc.cookie.split(";").length;
};

CookieManager.prototype.keys = function keys() {
    var result = [];
    var cookie_keys = this.doc.cookie.replace(/((?:^|\s*;)[^\=]+)(?=;|$)|^\s*|\s*(?:\=[^;]*)?(?:\1|$)/g, "").split(/\s*(?:\=[^;]*)?;\s*/);
    for (var i = 0, key = cookie_keys[i]; key; key = cookie_keys[++i]) {
        result.push(decodeURIComponent(key));
    }
    return result;
};

var CookieTester = function CookieTester(cookie_manager, reporter, options) {
    var setting = $.extend({
        cookie_value: '1',
        count_test_limit: 1000
    }, options);
    this.cookie_manager = cookie_manager;
    this.reporter = reporter;
    this.setting = setting;
};

CookieTester.prototype.testMaxCookieCountPerDomain = function testMaxCookieCountPerDomain() {
    var manager = this.cookie_manager,
        reporter = this.reporter,
        result,
        value = this.setting.cookie_value,
        key, current_count;

    manager.clear();

    for (var i = 1; i <= this.setting.count_test_limit; i++) {
        key = "abcdefghijklmnopqrstuvwxyz".charAt(parseInt(Math.random() * 26, 10)) + i;
        manager.setItem(key, value);
        current_count = manager.count();

        if (current_count !== i) {
            result = i - 1;
            break;
        }
    }

    if (result === undefined || result === this.setting.count_test_limit - 1) {
        reporter.warn_max_cookie_per_domain("it might reach limit of test. check the upper limit");
        result = this.setting.count_test_limit;
    }

    document.getElementById('ext').innerHTML = document.cookie;
    document.getElementById('ext2').innerHTML = manager.count();

    reporter.report_max_cookie_per_domain(result);
};

var HtmlReporter = function HtmlReporter() {
    this.report_max_cookie_per_domain = function (result) { document.getElementById('max_cookie_count_per_domain').innerHTML = result; };
    this.warn_max_cookie_per_domain = function (result) { document.getElementById('max_cookie_count_per_domain_warning').innerHTML = result; };
};

$(function() {
    var manager = new CookieManager();
    var reporter = new HtmlReporter();
    var tester = new CookieTester(manager, reporter);

    tester.testMaxCookieCountPerDomain();
});
	<!DOCTYPE html>
	<head>
	<title>Cookie restriction tester</title>
	<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
	<script src="tester.js"></script>
	</head>
	<body>
	<div id="max_cookie_count_per_domain"></div>
	<div id="max_cookie_count_per_domain_warning"></div>
	<div id="ext"></div>
	<div id="ext2"></div>
	</body>
	</html>
	var CookieManager = function CookieManager(doc) {
	this.doc = doc \|\| window.document;
	};

	CookieManager.prototype.setItem = function setItem(key, value) {
	// value of expire is random future
	this.doc.cookie = encodeURIComponent(key) + "=" + encodeURIComponent(value) + "; expires=" + (new Date((new Date()).valueOf() + parseInt(Math.random() * 10, 10) * 50000 + 100000)).toUTCString();
	};

	CookieManager.prototype.getItem = function getItem(key) {
	return decodeURIComponent(this.doc.cookie.replace(new RegExp("(?:(?:^\|.;)\\s" + encodeURIComponent(key).replace(/[\-\.\+\]/g, "\\$&") + "\\s\\=\\s([^;]).$)\|^.$"), "$1")) \|\| null;
	};

	CookieManager.prototype.removeItem = function removeItem(key) {
	document.cookie = encodeURIComponent(key) + "=; expires=Thu, 01 Jan 1970 00:00:00 GMT";
	};

	CookieManager.prototype.clear = function clear() {
	var keys = this.keys();
	for (var i = 0, key = keys[i]; key; key = keys[++i]) {
	this.removeItem(key);
	}
	if (this.count() !== 0) {
	throw "there are some cookies";
	}
	};

	CookieManager.prototype.count = function count() {
	if (!this.doc.cookie) return 0;
	return this.doc.cookie.split(";").length;
	};

	CookieManager.prototype.keys = function keys() {
	var result = [];
	var cookie_keys = this.doc.cookie.replace(/((?:^\|\s;)[^\=]+)(?=;\|$)\|^\s\|\s(?:\=[^;])?(?:\1\|$)/g, "").split(/\s(?:\=[^;])?;\s*/);
	for (var i = 0, key = cookie_keys[i]; key; key = cookie_keys[++i]) {
	result.push(decodeURIComponent(key));
	}
	return result;
	};

	var CookieTester = function CookieTester(cookie_manager, reporter, options) {
	var setting = $.extend({
	cookie_value: '1',
	count_test_limit: 1000
	}, options);
	this.cookie_manager = cookie_manager;
	this.reporter = reporter;
	this.setting = setting;
	};

	CookieTester.prototype.testMaxCookieCountPerDomain = function testMaxCookieCountPerDomain() {
	var manager = this.cookie_manager,
	reporter = this.reporter,
	result,
	value = this.setting.cookie_value,
	key, current_count;

	manager.clear();

	for (var i = 1; i <= this.setting.count_test_limit; i++) {
	key = "abcdefghijklmnopqrstuvwxyz".charAt(parseInt(Math.random() * 26, 10)) + i;
	manager.setItem(key, value);
	current_count = manager.count();

	if (current_count !== i) {
	result = i - 1;
	break;
	}
	}

	if (result === undefined \|\| result === this.setting.count_test_limit - 1) {
	reporter.warn_max_cookie_per_domain("it might reach limit of test. check the upper limit");
	result = this.setting.count_test_limit;
	}

	document.getElementById('ext').innerHTML = document.cookie;
	document.getElementById('ext2').innerHTML = manager.count();

	reporter.report_max_cookie_per_domain(result);
	};

	var HtmlReporter = function HtmlReporter() {
	this.report_max_cookie_per_domain = function (result) { document.getElementById('max_cookie_count_per_domain').innerHTML = result; };
	this.warn_max_cookie_per_domain = function (result) { document.getElementById('max_cookie_count_per_domain_warning').innerHTML = result; };
	};

	$(function() {
	var manager = new CookieManager();
	var reporter = new HtmlReporter();
	var tester = new CookieTester(manager, reporter);

	tester.testMaxCookieCountPerDomain();
	});