Wrong way to do objects in JS?

objects_in_js.js

function Test() {
  this.hurp = "HURP";
  this.durp = "DURP";
}

Test.prototype.publiclyDoStuff = function(foo) {
  this.privatelyDoStuff(foo);
}

Test.prototype.privatelyDoStuff(foo) {
  return hurp + foo;
}

http://www.adequatelygood.com/2010/3/JavaScript-Module-Pattern-In-Depth

    var MODULE = (function () {
    var my = {},
        privateVariable = 1;

    function privateMethod() {
        // ...
    }

    my.moduleProperty = 1;
    my.moduleMethod = function () {
        // ...
    };

    return my;
    }());