gomagoma676 / nextjs-testing

[テスト編] Nextjs + React-testing-libraryでモダンReactソフトウェアテスト / Section2 🚀

This is a Next.js project bootstrapped with create-next-app.

Project setup : Nextjs+React-testing-library+TypeScript+Tailwind CSS

1. Nextjs Project 新規作成

1-1. create-next-app

npx [email protected] . --use-npm

Node.js version 10.13以降が必要です。 -> ターミナル node -vでver確認出来ます。

1-2. 必要 module のインストール

npm i [email protected] [email protected] swr

1-3. prettierの設定 : package.json

    "prettier": {
        "singleQuote": true,
        "semi": false
    }

2. React-testing-library の導入

2-1. 必要 module のインストール

npm i [email protected] [email protected]
npm i [email protected]
npm i -D [email protected] @testing-library/[email protected] @types/[email protected] @testing-library/[email protected] @testing-library/[email protected] [email protected] @testing-library/[email protected] [email protected]

2-2. Project folder 直下に".babelrc"ファイルを作成して下記設定を追加

touch .babelrc

    {
        "presets": ["next/babel"]
    }

2-3. package.json に jest の設定を追記

    "jest": {
        "testPathIgnorePatterns": [
            "<rootDir>/.next/",
            "<rootDir>/node_modules/"
        ],
        "moduleNameMapper": {
            "\\.(css)$": "<rootDir>/node_modules/jest-css-modules"
        }
    }

2-4. package.jsonに test scriptを追記

    "scripts": {
        ...
        "test": "jest --env=jsdom --verbose"
    },

3. TypeScript の導入

https://nextjs.org/learn/excel/typescript/create-tsconfig

3-1. 空のtsconfig.json作成

touch tsconfig.json

3-2. 必要moduleのインストール

npm i -D typescript @types/[email protected] @types/[email protected]

3-3. 開発server起動

npm run dev

3-4. _app.js, index.js -> tsx へ拡張子変更

3-5. AppProps型追記

    import { AppProps } from 'next/app'

    function MyApp({ Component, pageProps }: AppProps) {
        return <Component {...pageProps} />
    }

    export default MyApp

4. Tailwind CSS の導入

https://tailwindcss.com/docs/guides/nextjs

4-1. 必要moduleのインストール

npm i tailwindcss@latest postcss@latest autoprefixer@latest

4-2. tailwind.config.js, postcss.config.jsの生成

npx tailwindcss init -p

4-3. tailwind.config.jsのpurge設定追加

module.exports = {
    content: [
        "./pages/**/*.{js,ts,jsx,tsx}",
        "./components/**/*.{js,ts,jsx,tsx}",
    ],
    darkMode: false,
    theme: {
        extend: {},
    },
    variants: {
        extend: {},
    },
    plugins: [],
}

4-4. globals.cssの編集

@tailwind base;
@tailwind components;
@tailwind utilities;

5. 動作確認

5-1. index.tsxの編集

const Home: React.FC = () => {
  return (
    <div className="flex justify-center items-center flex-col min-h-screen font-mono">
      Hello Nextjs
    </div>
  )
}
export default Home

npm run dev -> Tailwind CSSが効いているかブラウザで確認

5-2. __tests__フォルダとHome.test.tsxファイルの作成

import { render, screen } from '@testing-library/react'
import '@testing-library/jest-dom/extend-expect'
import Home from '../pages/index'

it('Should render hello text', () => {
  render(<Home />)
  expect(screen.getByText('Hello Nextjs')).toBeInTheDocument()
})

npm test -> テストがPASSするか確認

 PASS  __tests__/Home.test.tsx
  ✓ Should render hello text (20 ms)

Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        1.728 s, estimated 2 s