// react-testing-library renders your components to document.body, // this adds jest-dom's custom assertions import '@testing-library/jest-dom'; import 'react-app-polyfill/ie11'; import 'react-app-polyfill/stable'; import { JSDOM } from 'jsdom'; import { render as originalRender } from '@testing-library/react'; global.ResizeObserver = require('resize-observer-polyfill'); global.fetch = require('jest-fetch-mock'); const setDom = () => { const dom = new JSDOM('', {}); global.window = dom.window; global.document = dom.window.document; document.createRange = () => { const range = new Range(); range.getBoundingClientRect = jest.fn(); range.getClientRects = () => { return { item: () => null, length: 0, [Symbol.iterator]: jest.fn(), }; }; return range; }; }; export const render = ui => { setDom(); return originalRender(ui); };