jest-setup.js

import '@testing-library/jest-dom';
import { TextEncoder, TextDecoder } from 'util';

Object.assign(global, { TextDecoder, TextEncoder });

// https://jestjs.io/docs/manual-mocks#mocking-methods-which-are-not-implemented-in-jsdom
Object.defineProperty(global, 'matchMedia', {
    writable: true,
    value: (query) => ({
        matches: false,
        media: query,
        onchange: null,
        addListener: jest.fn(), // deprecated
        removeListener: jest.fn(), // deprecated
        addEventListener: jest.fn(),
        removeEventListener: jest.fn(),
        dispatchEvent: jest.fn(),
    }),
});

HTMLCanvasElement.prototype.getContext = () => { };