| import { createNext, FileRef } from 'e2e-utils' |
| import { NextInstance } from 'e2e-utils' |
| import { renderViaHTTP } from 'next-test-utils' |
| import { join } from 'node:path' |
|
|
| describe('next/jest', () => { |
| let next: NextInstance |
|
|
| beforeAll(async () => { |
| next = await createNext({ |
| files: { |
| 'public/vercel.svg': |
| '<svg width="24" height="24" xmlns="http://www.w3.org/2000/svg"/>', |
| 'components/comp.js': ` |
| export default function Comp() { |
| return <h1>Hello Dynamic</h1>; |
| } |
| `, |
| 'styles/index.module.css': '.home { color: orange }', |
| 'pages/index.js': ` |
| import dynamic from "next/dynamic"; |
| import Image from "next/image"; |
| import img from "../public/vercel.svg"; |
| import styles from "../styles/index.module.css"; |
| import localFont from "next/font/local"; |
| import { Inter } from "next/font/google"; |
| |
| const inter = Inter({ subsets: ["latin"] }); |
| const myFont = localFont({ src: "./my-font.woff2" }); |
| |
| const Comp = dynamic(() => import("../components/comp"), { |
| loading: () => <h1>Loading...</h1>, |
| }); |
| |
| export default function Page() { |
| return <> |
| <Comp /> |
| <Image src={img} alt="logo" placeholder="blur"/> |
| <Image src={img} alt="logo 2"/> |
| <p className={styles.home}>hello world</p> |
| <p style={{ fontFamily: inter.style.fontFamily }} className={myFont.className}>hello world</p> |
| </> |
| } |
| `, |
| 'jest.config.js': ` |
| // jest.config.js |
| const nextJest = require('next/jest') |
| |
| const createJestConfig = nextJest({ |
| // Provide the path to your Next.js app to load next.config.js and .env files in your test environment |
| dir: './', |
| }) |
| |
| // Add any custom config to be passed to Jest |
| const customJestConfig = { |
| // if using TypeScript with a baseUrl set to the root directory then you need the below for alias' to work |
| moduleDirectories: ['node_modules', '<rootDir>/'], |
| testEnvironment: 'jest-environment-jsdom', |
| setupFilesAfterEnv: ['<rootDir>/jest.setup.js'], |
| transform: { |
| // Use babel-jest to transpile tests with the next/babel preset |
| // https://jestjs.io/docs/configuration#transform-objectstring-pathtotransformer--pathtotransformer-object |
| '^.+\\.(js|jsx|ts|tsx)$': ['babel-jest', { presets: ['next/babel'] }], |
| }, |
| } |
| |
| // createJestConfig is exported this way to ensure that next/jest can load the Next.js config which is async |
| module.exports = createJestConfig(customJestConfig) |
| `, |
| 'jest.setup.js': ` |
| // Learn more: https://github.com/testing-library/jest-dom |
| import '@testing-library/jest-dom/extend-expect' |
| `, |
| 'test/dynamic.test.js': ` |
| import { render, screen, act } from "@testing-library/react"; |
| import Home from "../pages/index"; |
| |
| describe("Home", () => { |
| it("renders a heading", () => { |
| const { unmount } = render(<Home />); |
| |
| const heading = screen.getByRole("heading", { |
| name: /Loading/i, |
| }); |
| |
| expect(heading).toBeInTheDocument(); |
| |
| unmount(); |
| }); |
| }); |
| |
| `, |
| 'lib/hello.mjs': ` |
| import path from 'path' |
| |
| export default function hello() { |
| return path.join('hello', 'world') |
| } |
| `, |
| 'test/mjs-support.test.js': ` |
| import path from 'path' |
| import hello from '../lib/hello.mjs' |
| |
| it('should transpile .mjs file correctly', async () => { |
| expect(hello()).toBe(path.join('hello', 'world')) |
| }) |
| `, |
| 'test/mock.test.js': ` |
| import router from 'next/router' |
| |
| jest.mock('next/router', () => ({ |
| push: jest.fn(), |
| back: jest.fn(), |
| events: { |
| on: jest.fn(), |
| off: jest.fn(), |
| }, |
| asPath: jest.fn().mockReturnThis(), |
| beforePopState: jest.fn(() => null), |
| useRouter: () => ({ |
| push: jest.fn(), |
| }), |
| })) |
| |
| it('call mocked', async () => { |
| expect(router.push._isMockFunction).toBeTruthy() |
| }) |
| `, |
| 'pages/my-font.woff2': new FileRef( |
| join(__dirname, 'basic', 'my-font.woff2') |
| ), |
| }, |
| dependencies: { |
| '@next/font': 'canary', |
| jest: '29.7.0', |
| 'jest-environment-jsdom': '29.7.0', |
| '@testing-library/jest-dom': '5.16.1', |
| '@testing-library/react': '15.0.2', |
| '@testing-library/user-event': '14.5.2', |
| }, |
| packageJson: { |
| scripts: { |
| |
| build: 'next build && jest test/mock.test.js test/dynamic.test.js', |
| }, |
| }, |
| installCommand: 'pnpm i', |
| buildCommand: `pnpm build`, |
| }) |
| }) |
| afterAll(() => next.destroy()) |
|
|
| it('should work', async () => { |
| const html = await renderViaHTTP(next.url, '/') |
| expect(html).toContain('hello world') |
| }) |
| }) |
|
|
