client/test/setupTests.js

/* This file is automatically executed before running tests
 * https://create-react-app.dev/docs/running-tests/#initializing-test-environment
 */

// react-testing-library renders your components to document.body,
// this adds jest-dom's custom assertions
// https://github.com/testing-library/jest-dom#table-of-contents
import '@testing-library/jest-dom';

// 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/extend-expect';

// Mock canvas when run unit test cases with jest.
// 'react-lottie' uses canvas
import 'jest-canvas-mock';