Question

11

Is it possible to mock document.cookie in JavaScript?

rated 0 times [ 17] [ 6] / answers: 1 / hits: 35413 / 13 Years ago, thu, june 23, 2011, 12:00:00

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

document.cookie = name=oeschger;

document.cookie = favorite_food=tripe;

alert(document.cookie);

// displays: name=oeschger;favorite_food=tripe

If you tried to make a mock cookie using only a string, you would not get the same results:

var mockCookie = ;

mockCookie = name=oeschger;

mockCookie = favorite_food=tripe;

alert(mockCookie);

// displays: favorite_food=tripe

So, if you wanted to unit test a module that operates on the cookie, and if you wanted to use a mock cookie for those tests, could you? How?

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answered 13 Years ago alorafrancisl · Accepted Answer

You could create an object with a cookie setter and getter. Here is a very simple implementation:

var mock = {

    value_: '', 



    get cookie() {

        return this.value_;

    },



    set cookie(value) {

        this.value_ += value + ';';

    }

};

Might not work in all browsers though (especially IE). Update: It only works in browsers supporting ECMAScript 5!

More about getter and setters.

mock.cookie = name=oeschger;

mock.cookie = favorite_food=tripe;

alert(mock.cookie);

// displays: name=oeschger;favorite_food=tripe;

DEMO