How to mock/test event listeners with mocha/jest?

class Router {
    constructor() {
        window.onhashchange = this.hashChange;
    }

    hashChange() {
        console.log('Hash Changed');
        return true;
    }
}

export default Router;

I am trying to find a way to test the above piece of code in node.js. But there is no window object in node. How to mock objects and test event listeners using mocha/jest? The goal is to test that hashChange() is invoked when URL hash is changed