npm package: @mozilla/jest-environment-puppeteer
Description: Puppeteer environment for Jest.
Author: Greg Bergé
Latest version: 4.5.2

# jest-environment-puppeteer

[![Build Status][build-badge]][build]
[![version][version-badge]][package]
[![MIT License][license-badge]][license]

Run your tests using Jest & Puppeteer 🎪✨

```
npm install jest-environment-puppeteer puppeteer
```

## Usage

Update your Jest configuration:

```json
{
  "globalSetup": "jest-environment-puppeteer/setup",
  "globalTeardown": "jest-environment-puppeteer/teardown",
  "testEnvironment": "jest-environment-puppeteer"
}
```

Use Puppeteer in your tests:

```js
describe('Google', () => {
  beforeAll(async () => {
    await page.goto('https://google.com')
  })

  it('should display "google" text on page', async () => {
    const text = await page.evaluate(() => document.body.textContent)
    expect(text).toContain('google')
  })
})
```

## API

### `global.browser`

Give access to the [Puppeteer Browser](https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#class-browser).

```js
it('should open a new page', async () => {
  const page = await browser.newPage()
  await page.goto('https://google.com')
})
```

### `global.page`

Give access to a [Puppeteer Page](https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#class-page) opened at start (you will use it most of time).

```js
it('should fill an input', async () => {
  await page.type('#myinput', 'Hello')
})
```

### `global.context`

Give access to a [browser context](https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#class-browsercontext) that is instantiated when the browser is launched. You can control whether each test has its own isolated browser context using the `browserContext` option in your `jest-puppeteer.config.js`.

### `global.jestPuppeteer.debug()`

Put test in debug mode.

- Jest is suspended (no timeout)
- A `debugger` instruction to Chromium, if Puppeteer has been launched with `{ devtools: true }` it will stop

```js
it('should put test in debug mode', async () => {
  await jestPuppeteer.debug()
})
```

### `global.jestPuppeteer.resetPage()`

Reset global.page

```js
beforeEach(async () => {
  await jestPuppeteer.resetPage()
})
```

### `global.jestPuppeteer.resetBrowser()`

Reset global.browser, global.context, and global.page

```js
beforeEach(async () => {
  await jestPuppeteer.resetBrowser()
})
```

### `jest-puppeteer.config.js`

You can specify a `jest-puppeteer.config.js` at the root of the project or define a custom path using `JEST_PUPPETEER_CONFIG` environment variable. It should export a config object or a Promise for a config object.

- `launch` <[object]> [All Puppeteer launch options](https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#puppeteerlaunchoptions) can be specified in config. Since it is JavaScript, you can use all stuff you need, including environment.
- `connect` <[object]> [All Puppeteer connect options](https://github.com/GoogleChrome/puppeteer/blob/master/docs/api.md#puppeteerconnectoptions) can be specified in config. This is an alternative to `launch` config, allowing you to connect to an already running instance of Chrome.
- `browserContext` <[string]>. By default, the browser context (cookies, localStorage, etc) is shared between all tests. The following options are available for `browserContext`:
  - `default` Each test starts a tab, so all tests share the same context.
  - `incognito` Each tests starts an incognito window, so all tests have a separate, isolated context. Useful when running tests that could interfere with one another. (_Example: testing multiple users on the same app at once with login, transactions, etc._)
- `exitOnPageError` <[boolean]> Exits page on any global error message thrown. Defaults to `true`.
- `server` <[Object]> Server options allowed by [jest-dev-server](https://github.com/smooth-code/jest-puppeteer/tree/master/packages/jest-dev-server)

#### Example 1

```js
// jest-puppeteer.config.js
module.exports = {
  launch: {
    dumpio: true,
    headless: process.env.HEADLESS !== 'false',
  },
  server: {
    command: 'node server.js',
    port: 4444,
    launchTimeout: 10000,
    debug: true,
  },
}
```

#### Example 2

This example uses an already running instance of Chrome by passing the active web socket endpoint to `connect`. This is useful, for example, when you want to connect to Chrome running in the cloud.

```js
// jest-puppeteer.config.js
const fetch = require('node-fetch')
const dockerHost = 'http://localhost:9222'

async function getConfig() {
  const response = await fetch(`${dockerHost}/json/version`)
  const browserWSEndpoint = (await response.json()).webSocketDebuggerUrl
  return {
    connect: {
      browserWSEndpoint,
    },
    server: {
      command: 'node server.js',
      port: 3000,
      launchTimeout: 10000,
      debug: true,
    },
  }
}

module.exports = getConfig()
```

## Inspiration

Thanks to Fumihiro Xue for his great [Jest example](https://github.com/xfumihiro/jest-puppeteer-example).

## License

MIT

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[build]: https://travis-ci.org/smooth-code/jest-puppeteer
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[license]: https://github.com/smooth-code/jest-puppeteer/blob/master/LICENSE