JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
                    "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <link rel="stylesheet" href="http://code.jquery.com/qunit/git/qunit.css" type="text/css" media="screen" />
    </head>
    <body>
        <h1 id="qunit-header">QUnit example</h1>
        <h2 id="qunit-banner"></h2>
        <div id="qunit-testrunner-toolbar"></div>
        <h2 id="qunit-userAgent"></h2>
        <ol id="qunit-tests"></ol>
        <div id="qunit-fixture">test markup, will be hidden</div>
        <script src="http://code.jquery.com/jquery-latest.js"></script>
        <script type="text/javascript" src="http://code.jquery.com/qunit/git/qunit.js"></script>  
    </body>
</html>

JavaScript

$(function () {
    var Obj = function( val ){
            this.value = val;
    };
    Obj.prototype.toString = function(){
        return this.value;
    };
    Obj.prototype.valueOf = function(){
        return this.value;
    };
    var x = new Obj(42);
    var y = new Obj(42);
    var z = new Obj(10);
    test("Comparing custom objects", function () {
        equal(x >= y, true);
        equal(x <= y, true);
        equal(x >= z, true);
        equal(y >= z, true);
        equal(x.toString(), y.toString());
        equal(+x == +y, true);
        equal(x == y, true, "why does this fails.");
    });
});