mocha command giving ReferenceError: window is not defined

Question

I am using command:

mocha --compilers :./test/babel-setup.js --recursive --watch

It is giving error:

ReferenceError: window         


        

Answer 1

To test frontend libraries with mocha you need the node modul mocha-jsdom you find it here: https://www.npmjs.com/package/mocha-jsdom

Answer 2

I was able to use jsdom-global to fix this issue. Follow the instructions in that link to install. Specifically, run

npm install --save-dev --save-exact jsdom jsdom-global

then add -r jsdom-global/register to your mocha command-line. When you re-run your tests, the window is not defined error will go away.

Answer 3

Since I was doing too much with the window object, I just used this code to determine if I was in mocha or not.

function isMocha(){
    let context = (global || window);
    return ['afterEach','after','beforeEach','before','describe','it'].every(function(functionName){
        return context[functionName] instanceof Function;
    });
}