Fix Jest example app (#458)
* Add a working JEST example app. * Add README.md * Move react-test-renderer to devDeps. * Add a newline to the .babelrc
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7 changed files with 60 additions and 42 deletions
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examples/with-jest/.babelrc
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examples/with-jest/.babelrc
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{
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"presets": ["next/babel"]
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}
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examples/with-jest/README.md
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examples/with-jest/README.md
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# Example app using Jest to run tests
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This example features:
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* A properly configured Next.js app for Jest
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* An example test written with Jest Snapshot Testing
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* An example test written with Enzyme
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## How to run it
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```sh
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npm install
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npm run dev
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```
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## Jest related info
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After you've added `jest-cli` and `jest-babel` into your app, make sure to add the following `.babelrc` file.
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```json
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{
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"presets": ["next/babel"]
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}
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```
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It'll ask Jest to use the babel configurations used by Next.js.
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exports[`With Snapshot Testing App shows "Hello world!" 1`] = `
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<div>
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<p>
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Hello World!
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</p>
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</div>
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`;
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/* global it, expect */
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/* global it, expect, describe */
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import React from 'react'
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import { shallow } from 'enzyme'
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import renderer from 'react-test-renderer'
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import App from '../pages/index.js'
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it('App shows "Hello world!"', () => {
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const app = shallow(
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<App />
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)
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describe('With Enzyme', () => {
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it('App shows "Hello world!"', () => {
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const app = shallow(
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<App />
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)
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expect(app.find('p').text()).toEqual('Hello world!')
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expect(app.find('p').text()).toEqual('Hello World!')
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})
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})
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describe('With Snapshot Testing', () => {
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it('App shows "Hello world!"', () => {
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const component = renderer.create(<App />)
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const tree = component.toJSON()
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expect(tree).toMatchSnapshot()
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})
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})
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@ -1,7 +1,7 @@
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{
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"name": "my-app",
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"dependencies": {
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"next": "^1.0.0"
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"next": "^2.0.0-beta"
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},
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"scripts": {
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"test": "jest",
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@ -10,17 +10,12 @@
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"start": "next start"
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},
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"devDependencies": {
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"babel-jest": "^16.0.0",
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"babel-jest": "^18.0.0",
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"enzyme": "^2.5.1",
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"jest": "^16.0.2",
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"jest-cli": "^18.0.0",
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"react": "^15.3.2",
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"react-addons-test-utils": "^15.3.2",
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"react-dom": "^15.3.2"
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},
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"babel": {
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"presets": [
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"es2015",
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"react"
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]
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"react-dom": "^15.3.2",
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"react-test-renderer": "^15.4.1"
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}
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}
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export default () => (
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<div>
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<p>Hello world!</p>
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<p>Hello World!</p>
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</div>
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)
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## Add testing to your `next` app using `jest`
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[`jest`](https://facebook.github.io/jest/) is a testing framework for `react`. In this example we show how to use `jest` to do DOM-testing for react applications in `next`
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`npm install --save-dev jest babel-jest enzyme`
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* `jest` - The testing framework
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* `babel-jest` - Babel preprocessor for test files
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* `enzyme` - Mock render the elements
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Add test script to the [recommended `package.json`](https://github.com/zeit/next.js#production-deployment)
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__package.json__
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```javascript
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...
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"scripts": {
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"test": "jest",
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...
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}
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...
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```
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`npm run test`
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