create-react-ssr/setupTest.ts

// jest-dom adds custom jest matchers for asserting on DOM nodes.
// allows you to do things like:
// expect(element).toHaveTextContent(/react/i)
// learn more: https://github.com/testing-library/jest-dom
import '@testing-library/jest-dom';
import { TextEncoder, TextDecoder } from 'util';

//import fetch Mock
import fetchMock from 'jest-fetch-mock';
fetchMock.enableMocks();

//Fixing Pollyfill for react-slick
window.matchMedia =
window.matchMedia ||
function() {
	return {
		matches: false,
		addListener: () => {/**/},
		removeListener: () => {/**/}
	};
};

global.TextEncoder = TextEncoder;
global.TextDecoder = TextDecoder as typeof global.TextDecoder;