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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?

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.
                Where exactly do you "add -r jsdom-global/register to your mocha command-line"? Sorry, I am a total noob at this.
– Josh
                Aug 8, 2020 at 8:24
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;
        
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