Is it possible to mock [removed] in JavaScript?

Question

document.cookie is like a string, but it is not a string. To quote the example from the Mozilla doc:

document.cookie = \"name=oeschger\";
docume         


        

Answer 1

Personally i was unable to hijack the document object. A simple solution which seems to work for me was the following...

At the top of my test script i define a fakeCookie object:

var fakeCookie = {
    cookies: [],
    set: function (k, v) {
        this.cookies[k] = v;
    },
    get: function (k) {
        return this.cookies[k];
    },
    reset: function () {
        this.cookies = [];
    }
};

Then in my beforeEach() i define my cookie stub. This basically intercepts calls to jQuery.cookie and (instead!) call the callback function that i have defined (see below):

beforeEach(function() {
    var cookieStub = sinon.stub(jQuery, "cookie", function() {
        if (arguments.length > 1) {
            fakeCookie.set(arguments[0], arguments[1]);
        }
        else {
            return fakeCookie.get(arguments[0]);
        }
    });
});

Any time that i get or set a cookie value it uses my fakeCookie instead of the real jQuery.cookie. It does this by looking at the number of parameters passed and deduces whether its a get/set. I literally pasted this in and it all worked straight off the bat. Hope this helps!!