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 is not defined

I have the following in my babel-setup.js:

require("babel/register")({
  compact: false
});

I am using node 0.12.7 and "mocha": "^2.2.5" and "jsdom": "^3.1.2".

I already have jsdom installed with the project.

What is causing the error?

what is in the "babel/register" file? – sachin.ph Dec 03 '15 at 07:06 — sachin.ph, Dec 03 '15 at 07:06
look like it is there for jsx support – jit Dec 03 '15 at 07:24 — jit, Dec 03 '15 at 07:24

score 96 · Answer 1 · answered Jul 21 '16 at 22:56

96

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.

answered Jul 21 '16 at 22:56

emmby

99,783
65
191
249

5

should be marked as an answer, works like a charm, thanks :) – alek kowalczyk Nov 11 '16 at 15:58
For yarn, use `yarn add jsdom jsdom-global -DE` – axmrnv Oct 18 '18 at 11:36
Where exactly do you "add -r jsdom-global/register to your mocha command-line"? Sorry, I am a total noob at this. – Josh Aug 08 '20 at 08:24
It doesn't work if you are trying to use localStorage – Adam Fowler Dec 02 '20 at 03:12

score 2 · Answer 2 · answered Dec 03 '15 at 07:56

2

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

answered Dec 03 '15 at 07:56

Henry31

105
1
11

i looked into that package it is not supporting node 0.12.7 and requires io.js – jit Dec 03 '15 at 08:59
oh, i'm sorry for that. We use Node 4.0.0. Is an update not being considered for you? – Henry31 Dec 03 '15 at 09:26
actually it's deprecated – Franco Manzur Jan 25 '17 at 19:33

score 0 · Answer 3 · answered Dec 02 '20 at 04:03

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;
    });
}

mocha command giving ReferenceError: window is not defined

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