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testing-library
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Description

🐐 Simple and complete React DOM testing utilities that encourage good testing practices.

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React Testing Library

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Simple and complete React DOM testing utilities that encourage good testing practices.


Read The Docs | Edit the docs



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Table of Contents

The problem

You want to write maintainable tests for your React components. As a part of this goal, you want your tests to avoid including implementation details of your components and rather focus on making your tests give you the confidence for which they are intended. As part of this, you want your testbase to be maintainable in the long run so refactors of your components (changes to implementation but not functionality) don't break your tests and slow you and your team down.

The solution

The

React Testing Library
is a very lightweight solution for testing React components. It provides light utility functions on top of
react-dom
and
react-dom/test-utils
, in a way that encourages better testing practices. Its primary guiding principle is:

The more your tests resemble the way your software is used, the more confidence they can give you.

Installation

This module is distributed via npm which is bundled with node and should be installed as one of your project's

devDependencies
:
npm install --save-dev @testing-library/react

or

for installation via yarn

yarn add --dev @testing-library/react

This library has

peerDependencies
listings for
react
and
react-dom
.

You may also be interested in installing

@testing-library/jest-dom
so you can use the custom jest matchers.

Docs

Suppressing unnecessary warnings on React DOM 16.8

There is a known compatibility issue with React DOM 16.8 where you will see the following warning:

Warning: An update to ComponentName inside a test was not wrapped in act(...).

If you cannot upgrade to React DOM 16.9, you may suppress the warnings by adding the following snippet to your test configuration (learn more):

// this is just a little hack to silence a warning that we'll get until we
// upgrade to 16.9. See also: https://github.com/facebook/react/pull/14853
const originalError = console.error
beforeAll(() => {
  console.error = (...args) => {
    if (/Warning.*not wrapped in act/.test(args[0])) {
      return
    }
    originalError.call(console, ...args)
  }
})

afterAll(() => { console.error = originalError })

Examples

Basic Example

// hidden-message.js
import * as React from 'react'

// NOTE: React Testing Library works well with React Hooks and classes. // Your tests will be the same regardless of how you write your components. function HiddenMessage({children}) { const [showMessage, setShowMessage] = React.useState(false) return (

setShowMessage(e.target.checked)} checked={showMessage} /> {showMessage ? children : null}
) }

export default HiddenMessage

// tests/hidden-message.js
// these imports are something you'd normally configure Jest to import for you
// automatically. Learn more in the setup docs: https://testing-library.com/docs/react-testing-library/setup#cleanup
import '@testing-library/jest-dom'
// NOTE: jest-dom adds handy assertions to Jest and is recommended, but not required

import * as React from 'react' import {render, fireEvent, screen} from '@testing-library/react' import HiddenMessage from '../hidden-message'

test('shows the children when the checkbox is checked', () => { const testMessage = 'Test Message' render({testMessage})

// query* functions will return the element or null if it cannot be found // get* functions will return the element or throw an error if it cannot be found expect(screen.queryByText(testMessage)).toBeNull()

// the queries can accept a regex to make your selectors more resilient to content tweaks and changes. fireEvent.click(screen.getByLabelText(/show/i))

// .toBeInTheDocument() is an assertion that comes from jest-dom // otherwise you could use .toBeDefined() expect(screen.getByText(testMessage)).toBeInTheDocument() })

Complex Example

// login.js
import * as React from 'react'

function Login() { const [state, setState] = React.useReducer((s, a) => ({...s, ...a}), { resolved: false, loading: false, error: null, })

function handleSubmit(event) { event.preventDefault() const {usernameInput, passwordInput} = event.target.elements

setState({loading: true, resolved: false, error: null})

window
  .fetch('/api/login', {
    method: 'POST',
    headers: {'Content-Type': 'application/json'},
    body: JSON.stringify({
      username: usernameInput.value,
      password: passwordInput.value,
    }),
  })
  .then(r =&gt; r.json().then(data =&gt; (r.ok ? data : Promise.reject(data))))
  .then(
    user =&gt; {
      setState({loading: false, resolved: true, error: null})
      window.localStorage.setItem('token', user.token)
    },
    error =&gt; {
      setState({loading: false, resolved: false, error: error.message})
    },
  )

}

return (

Submit{state.loading ? '...' : null} {state.error ?
{state.error}
: null} {state.resolved ? (
Congrats! You're signed in!
) : null}
) }

export default Login

// tests/login.js
// again, these first two imports are something you'd normally handle in
// your testing framework configuration rather than importing them in every file.
import '@testing-library/jest-dom'
import * as React from 'react'
// import API mocking utilities from Mock Service Worker.
import {rest} from 'msw'
import {setupServer} from 'msw/node'
// import testing utilities
import {render, fireEvent, screen} from '@testing-library/react'
import Login from '../login'

const fakeUserResponse = {token: 'fake_user_token'} const server = setupServer( rest.post('/api/login', (req, res, ctx) => { return res(ctx.json(fakeUserResponse)) }), )

beforeAll(() => server.listen()) afterEach(() => { server.resetHandlers() window.localStorage.removeItem('token') }) afterAll(() => server.close())

test('allows the user to login successfully', async () => { render()

// fill out the form fireEvent.change(screen.getByLabelText(/username/i), { target: {value: 'chuck'}, }) fireEvent.change(screen.getByLabelText(/password/i), { target: {value: 'norris'}, })

fireEvent.click(screen.getByText(/submit/i))

// just like a manual tester, we'll instruct our test to wait for the alert // to show up before continuing with our assertions. const alert = await screen.findByRole('alert')

// .toHaveTextContent() comes from jest-dom's assertions // otherwise you could use expect(alert.textContent).toMatch(/congrats/i) // but jest-dom will give you better error messages which is why it's recommended expect(alert).toHaveTextContent(/congrats/i) expect(window.localStorage.getItem('token')).toEqual(fakeUserResponse.token) })

test('handles server exceptions', async () => { // mock the server error response for this test suite only. server.use( rest.post('/api/login', (req, res, ctx) => { return res(ctx.status(500), ctx.json({message: 'Internal server error'})) }), )

render()

// fill out the form fireEvent.change(screen.getByLabelText(/username/i), { target: {value: 'chuck'}, }) fireEvent.change(screen.getByLabelText(/password/i), { target: {value: 'norris'}, })

fireEvent.click(screen.getByText(/submit/i))

// wait for the error message const alert = await screen.findByRole('alert')

expect(alert).toHaveTextContent(/internal server error/i) expect(window.localStorage.getItem('token')).toBeNull() })

We recommend using Mock Service Worker library to declaratively mock API communication in your tests instead of stubbing

window.fetch
, or relying on third-party adapters.

More Examples

We're in the process of moving examples to the docs site

You'll find runnable examples of testing with different libraries in the

react-testing-library-examples
codesandbox. Some included are:

You can also find React Testing Library examples at react-testing-examples.com.

Hooks

If you are interested in testing a custom hook, check out React Hooks Testing Library.

NOTE: it is not recommended to test single-use custom hooks in isolation from the components where it's being used. It's better to test the component that's using the hook rather than the hook itself. The

React Hooks Testing Library
is intended to be used for reusable hooks/libraries.

Guiding Principles

The more your tests resemble the way your software is used, the more confidence they can give you.

We try to only expose methods and utilities that encourage you to write tests that closely resemble how your React components are used.

Utilities are included in this project based on the following guiding principles:

  1. If it relates to rendering components, it deals with DOM nodes rather than component instances, nor should it encourage dealing with component instances.
  2. It should be generally useful for testing individual React components or full React applications. While this library is focused on
    react-dom
    , utilities could be included even if they don't directly relate to
    react-dom
    .
  3. Utility implementations and APIs should be simple and flexible.

Most importantly, we want React Testing Library to be pretty light-weight, simple, and easy to understand.

Docs

Read The Docs | Edit the docs

Issues

Looking to contribute? Look for the Good First Issue label.

πŸ› Bugs

Please file an issue for bugs, missing documentation, or unexpected behavior.

See Bugs

πŸ’‘ Feature Requests

Please file an issue to suggest new features. Vote on feature requests by adding a πŸ‘. This helps maintainers prioritize what to work on.

See Feature Requests

❓ Questions

For questions related to using the library, please visit a support community instead of filing an issue on GitHub.

Contributors

Thanks goes to these people (emoji key):


Kent C. Dodds

πŸ’» πŸ“– πŸš‡ ⚠️

Ryan Castner

πŸ“–

Daniel Sandiego

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PaweΕ‚ MikoΕ‚ajczyk

πŸ’»

Alejandro ÑÑñez Ortiz

πŸ“–

Matt Parrish

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Justin Hall

πŸ“¦

Anto Aravinth

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Jonah Moses

πŸ“–

Łukasz Gandecki

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Ivan Babak

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Jesse Day

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Michal Baranowski

πŸ“ βœ…

Arthur Puthin

πŸ“–

Thomas Chia

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Thiago Galvani

πŸ“–

Christian

⚠️

Alex Krolick

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Johann Hubert Sonntagbauer

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Maddi Joyce

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Ryan Vice

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Ian Wilson

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Daniel

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Giorgio Polvara

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mohamedmagdy17593

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Marco Moretti

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This project follows the all-contributors specification. Contributions of any kind welcome!

LICENSE

MIT

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