jest.setup.js

// Optional: configure or set up a testing framework before each test.
// If you delete this file, remove `setupFilesAfterEnv` from `jest.config.js`

// Used for __tests__/testing-library.js
// Learn more: https://github.com/testing-library/jest-dom
import '@testing-library/jest-dom/extend-expect'
import { TextDecoder, TextEncoder } from 'util'

global.setImmediate = jest.useRealTimers
global.TextDecoder = TextDecoder
global.TextEncoder = TextEncoder

Object.defineProperty(window, 'matchMedia', {
	writable: true,
	value: jest.fn().mockImplementation(query => ({
		matches: false,
		media: query,
		onchange: null,
		addListener: jest.fn(), // Deprecated
		removeListener: jest.fn(), // Deprecated
		addEventListener: jest.fn(),
		removeEventListener: jest.fn(),
		dispatchEvent: jest.fn(),
	})),
})

window.IntersectionObserver = jest.fn(() => ({
	observe: jest.fn(),
	unobserve: jest.fn(),
	disconnect: jest.fn(),
}))

jest.mock('next/dynamic', () => () => {
	const DynamicComponent = () => null
	DynamicComponent.displayName = 'LoadableComponent'
	DynamicComponent.preload = jest.fn()
	return DynamicComponent
})