test-setup.js

// ==================================================================
// Configure enzyme to work with React 16
// ==================================================================
const enzyme = require('enzyme');
const Adapter = require('enzyme-adapter-react-16');

enzyme.configure({ adapter: new Adapter() });

// ==================================================================
// Create a browser-like environment for enzyme's `mount()` to work
// See: https://github.com/enzymejs/enzyme/blob/master/docs/guides/jsdom.md#using-enzyme-with-jsdom
// ==================================================================
const { JSDOM } = require('jsdom');

const jsdom = new JSDOM('<!doctype html><html><body></body></html>');
const { window } = jsdom;

function copyProps(src, target) {
  Object.defineProperties(target, {
    ...Object.getOwnPropertyDescriptors(src),
    ...Object.getOwnPropertyDescriptors(target),
  });
}

global.window = window;
global.document = window.document;
global.navigator = {
  userAgent: 'node.js',
};
global.requestAnimationFrame = function(callback) {
  return setTimeout(callback, 0);
};
global.cancelAnimationFrame = function(id) {
  clearTimeout(id);
};
copyProps(window, global);