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react-testing-library

6.0.2 • Public • Published

react-testing-library

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

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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.

This 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.

Example

// __tests__/fetch.js
import React from 'react'
import {render, fireEvent, cleanup, waitForElement} from 'react-testing-library'
// this adds custom jest matchers from jest-dom
import 'jest-dom/extend-expect'
 
// the mock lives in a __mocks__ directory
// to know more about manual mocks, access: https://jestjs.io/docs/en/manual-mocks
import axiosMock from 'axios'
import Fetch from '../fetch' // see the tests for a full implementation
 
// automatically unmount and cleanup DOM after the test is finished.
afterEach(cleanup)
 
test('Fetch makes an API call and displays the greeting when load-greeting is clicked', async () => {
  // Arrange
  axiosMock.get.mockResolvedValueOnce({data: {greeting: 'hello there'}})
  const url = '/greeting'
  const {getByText, getByTestId, container, asFragment} = render(
    <Fetch url={url} />,
  )
 
  // Act
  fireEvent.click(getByText(/load greeting/i))
 
  // Let's wait until our mocked `get` request promise resolves and
  // the component calls setState and re-renders.
  // getByTestId throws an error if it cannot find an element with the given ID
  // and waitForElement will wait until the callback doesn't throw an error
  const greetingTextNode = await waitForElement(() =>
    getByTestId('greeting-text'),
  )
 
  // Assert
  expect(axiosMock.get).toHaveBeenCalledTimes(1)
  expect(axiosMock.get).toHaveBeenCalledWith(url)
  expect(getByTestId('greeting-text')).toHaveTextContent('hello there')
  expect(getByTestId('ok-button')).toHaveAttribute('disabled')
  // snapshots work great with regular DOM nodes!
  expect(container.firstChild).toMatchSnapshot()
  // you can also use get a `DocumentFragment`, which is useful if you want to compare nodes across render
  expect(asFragment()).toMatchSnapshot()
})

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 react-testing-library

This library has peerDependencies listings for react and react-dom.

You may also be interested in installing jest-dom so you can use the custom jest matchers.

Docs

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 examples directory. 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

Other Solutions

In preparing this project, I tweeted about it and Sune Simonsen took up the challenge. We had different ideas of what to include in the library, so I decided to create this one instead.

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.

At the end of the day, what we want is for this library to be pretty light-weight, simple, and understandable.

Contributors

Thanks goes to these people (emoji key):

Kent C. Dodds
Kent C. Dodds

💻 📖 🚇 ⚠️
Ryan Castner
Ryan Castner

📖
Daniel Sandiego
Daniel Sandiego

💻
Paweł Mikołajczyk
Paweł Mikołajczyk

💻
Alejandro Ñáñez Ortiz
Alejandro Ñáñez Ortiz

📖
Matt Parrish
Matt Parrish

🐛 💻 📖 ⚠️
Justin Hall
Justin Hall

📦
Anto Aravinth
Anto Aravinth

💻 ⚠️ 📖
Jonah Moses
Jonah Moses

📖
Łukasz Gandecki
Łukasz Gandecki

💻 ⚠️ 📖
Ivan Babak
Ivan Babak

🐛 🤔
Jesse Day
Jesse Day

💻
Ernesto García
Ernesto García

💬 💻 📖
Josef Maxx Blake
Josef Maxx Blake

💻 📖 ⚠️
Michal Baranowski
Michal Baranowski

📝
Arthur Puthin
Arthur Puthin

📖
Thomas Chia
Thomas Chia

💻 📖
Thiago Galvani
Thiago Galvani

📖
Christian
Christian

⚠️
Alex Krolick
Alex Krolick

💬 📖 💡 🤔
Johann Hubert Sonntagbauer
Johann Hubert Sonntagbauer

💻 📖 ⚠️
Maddi Joyce
Maddi Joyce

💻
Ryan Vice
Ryan Vice

📖
Ian Wilson
Ian Wilson

📝
Daniel
Daniel

🐛 💻
Giorgio Polvara
Giorgio Polvara

🐛 🤔
John Gozde
John Gozde

💻
Sam Horton
Sam Horton

📖 💡 🤔
Richard Kotze (mobile)
Richard Kotze (mobile)

📖
Brahian E. Soto Mercedes
Brahian E. Soto Mercedes

📖
Benoit de La Forest
Benoit de La Forest

📖
Salah
Salah

💻 ⚠️
Adam Gordon
Adam Gordon

🐛 💻
Matija Marohnić
Matija Marohnić

📖
Justice Mba
Justice Mba

📖
Mark Pollmann
Mark Pollmann

📖
Ehtesham Kafeel
Ehtesham Kafeel

💻 📖
Julio Pavón
Julio Pavón

💻
Duncan L
Duncan L

📖 💡
Tiago Almeida
Tiago Almeida

📖
Robert Smith
Robert Smith

🐛
Zach Green
Zach Green

📖
dadamssg
dadamssg

📖
Yazan Aabed
Yazan Aabed

📝
Tim
Tim

🐛 💻 📖 ⚠️
Divyanshu Maithani
Divyanshu Maithani

📹
Deepak Grover
Deepak Grover

📹
Eyal Cohen
Eyal Cohen

📖
Peter Makowski
Peter Makowski

📖
Michiel Nuyts
Michiel Nuyts

📖
Joe Ng'ethe
Joe Ng'ethe

💻 📖
Kate
Kate

📖
Sean
Sean

📖
James Long
James Long

🤔 📦
Herb Hagely
Herb Hagely

💡
Alex Wendte
Alex Wendte

💡
Monica Powell
Monica Powell

📖
Vitaly Sivkov
Vitaly Sivkov

💻
Weyert de Boer
Weyert de Boer

🤔 👀
EstebanMarin
EstebanMarin

📖
Victor Martins
Victor Martins

📖
Royston Shufflebotham
Royston Shufflebotham

🐛 📖 💡
chrbala
chrbala

💻
Donavon West
Donavon West

💻 📖 🤔 ⚠️
Richard Maisano
Richard Maisano

💻
Marco Biedermann
Marco Biedermann

💻 🚧 ⚠️
Alex Zherdev
Alex Zherdev

🐛 💻
André Matulionis dos Santos
André Matulionis dos Santos

💻 💡 ⚠️
Daniel K.
Daniel K.

🐛 💻 🤔 ⚠️
mohamedmagdy17593
mohamedmagdy17593

💻
Loren ☺️
Loren ☺️

📖
MarkFalconbridge
MarkFalconbridge

🐛 💻
Vinicius
Vinicius

📖 💡
Peter Schyma
Peter Schyma

💻

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

Issues

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

🐛 Bugs

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

See Bugs

💡 Feature Requests

Please file an issue to suggest new features. Vote on feature requests by adding a 👍. 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.

LICENSE

MIT

install

npm i react-testing-library

Downloadsweekly downloads

215,604

version

6.0.2

license

MIT

homepage

github.com

repository

Gitgithub

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