eslint-plugin-testing-library

ESLint plugin to follow best practices and anticipate common mistakes when writing tests with Testing Library

---

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[![All Contributors][all-contributors-badge]](#contributors-)

Prerequisites

To use this plugin, you must have Node.js (^18.18.0, ^20.9.0, or >=21.1.0) installed.

Installation

You'll first need to install ESLint.

Next, install eslint-plugin-testing-library:

``shell
$ pnpm add --save-dev eslint-plugin-testing-library


or

Note: If you installed ESLint globally (using the -g flag) then you must also install eslint-plugin-testing-library globally.

Migrating

You can find detailed guides for migrating eslint-plugin-testing-library in the migration guide docs:

- Migration guide for v4
- Migration guide for v5
- Migration guide for v6
- Migration guide for v7

Usage

Add testing-library to the plugins section of your .eslintrc.js configuration file. You can omit the eslint-plugin- prefix:

`js
module.exports = {
plugins: ['testing-library'],
};
`

Then configure the rules you want to use within rules property of your .eslintrc:

`js
module.exports = {
rules: {
'testing-library/await-async-queries': 'error',
'testing-library/no-await-sync-queries': 'error',
'testing-library/no-debugging-utils': 'warn',
'testing-library/no-dom-import': 'off',
},
};
`

$3

With the default setup mentioned before, eslint-plugin-testing-library will be run against your whole codebase. If you want to run this plugin only against your tests files, you have the following options:

#### ESLint overrides

One way of restricting ESLint config by file patterns is by using ESLint overrides.

Assuming you are using the same pattern for your test files as Jest by default, the following config would run eslint-plugin-testing-library only against your test files:

`js
// .eslintrc.js
module.exports = {
// 1) Here we have our usual config which applies to the whole project, so we don't put testing-library preset here.
extends: ['airbnb', 'plugin:prettier/recommended'],

// 2) We load other plugins than eslint-plugin-testing-library globally if we want to.
plugins: ['react-hooks'],

overrides: [
{
// 3) Now we enable eslint-plugin-testing-library rules or preset only for matching testing files!
files: ['/__tests__//.[jt]s?(x)', '/?(.)+(spec|test).[jt]s?(x)'],
extends: ['plugin:testing-library/react'],
},
],
};
`

#### ESLint Cascading and Hierarchy

Another approach for customizing ESLint config by paths is through ESLint Cascading and Hierarchy. This is useful if all your tests are placed under the same folder, so you can place there another .eslintrc where you enable eslint-plugin-testing-library for applying it only to the files under such folder, rather than enabling it on your global .eslintrc which would apply to your whole project.

Shareable configurations

> [!NOTE]
>
> eslint.config.js compatible versions of configs are available prefixed with
> flat/, though most of the plugin documentation still currently uses
> .eslintrc syntax.
>
> Refer to the
> ESLint documentation on the new configuration file format
> for more.

This plugin exports several recommended configurations that enforce good practices for specific Testing Library packages.
You can find more info about enabled rules in the Supported Rules section, under the Configurations column.

Since each one of these configurations is aimed at a particular Testing Library package, they are not extendable between them, so you should use only one of them at once per .eslintrc file. For example, if you want to enable recommended configuration for React, you don't need to combine it somehow with DOM one:

`js
// ❌ Don't do this
module.exports = {
extends: ['plugin:testing-library/dom', 'plugin:testing-library/react'],
};
`

`js
// ✅ Just do this instead
module.exports = {
extends: ['plugin:testing-library/react'],
};
`

$3

Enforces recommended rules for DOM Testing Library.

To enable this configuration use the extends property in your
.eslintrc.js config file:

`js
module.exports = {
extends: ['plugin:testing-library/dom'],
};
`

To enable this configuration with eslint.config.js, use
testingLibrary.configs['flat/dom']:

`js
const testingLibrary = require('eslint-plugin-testing-library');

module.exports = [
{
files: [
/ glob matching your test files /
],
...testingLibrary.configs['flat/dom'],
},
];
`

$3

Enforces recommended rules for Angular Testing Library.

To enable this configuration use the extends property in your
.eslintrc.js config file:

`js
module.exports = {
extends: ['plugin:testing-library/angular'],
};
`

To enable this configuration with eslint.config.js, use
testingLibrary.configs['flat/angular']:

`js
const testingLibrary = require('eslint-plugin-testing-library');

module.exports = [
{
files: [
/ glob matching your test files /
],
...testingLibrary.configs['flat/angular'],
},
];
`

$3

Enforces recommended rules for React Testing Library.

To enable this configuration use the extends property in your
.eslintrc.js config file:

`js
module.exports = {
extends: ['plugin:testing-library/react'],
};
`

To enable this configuration with eslint.config.js, use
testingLibrary.configs['flat/react']:

`js
const testingLibrary = require('eslint-plugin-testing-library');

module.exports = [
{
files: [
/ glob matching your test files /
],
...testingLibrary.configs['flat/react'],
},
];
`

$3

Enforces recommended rules for Vue Testing Library.

To enable this configuration use the extends property in your
.eslintrc.js config file:

`js
module.exports = {
extends: ['plugin:testing-library/vue'],
};
`

To enable this configuration with eslint.config.js, use
testingLibrary.configs['flat/vue']:

`js
const testingLibrary = require('eslint-plugin-testing-library');

module.exports = [
{
files: [
/ glob matching your test files /
],
...testingLibrary.configs['flat/vue'],
},
];
`

$3

Enforces recommended rules for Svelte Testing Library.

To enable this configuration use the extends property in your
.eslintrc.js config file:

`js
module.exports = {
extends: ['plugin:testing-library/svelte'],
};
`

To enable this configuration with eslint.config.js, use
testingLibrary.configs['flat/svelte']:

`js
const testingLibrary = require('eslint-plugin-testing-library');

module.exports = [
{
files: [
/ glob matching your test files /
],
...testingLibrary.configs['flat/svelte'],
},
];
`

$3

Enforces recommended rules for Marko Testing Library.

To enable this configuration use the extends property in your
.eslintrc.js config file:

`js
module.exports = {
extends: ['plugin:testing-library/marko'],
};
`

To enable this configuration with eslint.config.js, use
testingLibrary.configs['flat/marko']:

`js
const testingLibrary = require('eslint-plugin-testing-library');

module.exports = [
{
files: [
/ glob matching your test files /
],
...testingLibrary.configs['flat/marko'],
},
];
`

Supported Rules

> Remember that all rules from this plugin are prefixed by "testing-library/"

💼 Configurations enabled in.\
⚠️ Configurations set to warn in.\
🔧 Automatically fixable by the --fix CLI option.

| Name                            | Description | 💼 | ⚠️ | 🔧 |
| :------------------------------------------------------------------------------- | :------------------------------------------------------------------------------------------- | :--------------------------------------------------------------------------------------------------- | :------------------------------------------------------------------------------------ | :-- |
| await-async-events | Enforce promises from async event methods are handled | ![badge-angular][] ![badge-dom][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | 🔧 |
| await-async-queries | Enforce promises from async queries to be handled | ![badge-angular][] ![badge-dom][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | 🔧 |
| await-async-utils | Enforce promises from async utils to be awaited properly | ![badge-angular][] ![badge-dom][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | 🔧 |
| consistent-data-testid | Ensures consistent usage of data-testid | | | |
| no-await-sync-events | Disallow unnecessary await for sync events | ![badge-angular][] ![badge-dom][] ![badge-react][] | | |
| no-await-sync-queries | Disallow unnecessary await for sync queries | ![badge-angular][] ![badge-dom][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | 🔧 |
| no-container | Disallow the use of container methods | ![badge-angular][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | |
| no-debugging-utils | Disallow the use of debugging utilities like debug | | ![badge-angular][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | |
| no-dom-import | Disallow importing from DOM Testing Library | ![badge-angular][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | 🔧 |
| no-global-regexp-flag-in-query | Disallow the use of the global RegExp flag (/g) in queries | ![badge-angular][] ![badge-dom][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | 🔧 |
| no-manual-cleanup | Disallow the use of cleanup | ![badge-react][] ![badge-svelte][] ![badge-vue][] | | |
| no-node-access | Disallow direct Node access | ![badge-angular][] ![badge-dom][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | |
| no-promise-in-fire-event | Disallow the use of promises passed to a fireEvent method | ![badge-angular][] ![badge-dom][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | |
| no-render-in-lifecycle | Disallow the use of render in testing frameworks setup functions | ![badge-angular][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | |
| no-test-id-queries | Ensure no data-testid queries are used | | | |
| no-unnecessary-act | Disallow wrapping Testing Library utils or empty callbacks in act | ![badge-marko][] ![badge-react][] | | |
| no-wait-for-multiple-assertions | Disallow the use of multiple expect calls inside waitFor | ![badge-angular][] ![badge-dom][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | 🔧 |
| no-wait-for-side-effects | Disallow the use of side effects in waitFor | ![badge-angular][] ![badge-dom][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | 🔧 |
| no-wait-for-snapshot | Ensures no snapshot is generated inside of a waitFor call | ![badge-angular][] ![badge-dom][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | |
| prefer-explicit-assert | Suggest using explicit assertions rather than standalone queries | | | |
| prefer-find-by | Suggest using find(All)By query instead of waitFor + get(All)By to wait for elements | ![badge-angular][] ![badge-dom][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | 🔧 |
| prefer-implicit-assert | Suggest using implicit assertions for getBy & findBy queries | | | |
| prefer-presence-queries | Ensure appropriate get/query queries are used with their respective matchers | ![badge-angular][] ![badge-dom][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | 🔧 |
| prefer-query-by-disappearance | Suggest using queryBy* queries when waiting for disappearance | ![badge-angular][] ![badge-dom][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | |
| prefer-query-matchers | Ensure the configured get/query query is used with the corresponding matchers | | | |
| prefer-screen-queries | Suggest using screen while querying | ![badge-angular][] ![badge-dom][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | |
| prefer-user-event | Suggest using userEvent over fireEvent for simulating user interactions | | | |
| prefer-user-event-setup | Suggest using userEvent with setup() instead of direct methods | | | |
| render-result-naming-convention | Enforce a valid naming for return value from render | ![badge-angular][] ![badge-marko][] ![badge-react][] ![badge-svelte][] ![badge-vue][] | | |

Aggressive Reporting

In v4 this plugin introduced a new feature called "Aggressive Reporting", which intends to detect Testing Library utils usages even if they don't come directly from a Testing Library package (i.e. using a custom utility file to re-export everything from Testing Library). You can read more about this feature here.

If you are looking to restricting or switching off this feature, please refer to the Shared Settings section to do so.

Shared Settings

There are some configuration options available that will be shared across all the plugin rules. This is achieved using ESLint Shared Settings. These Shared Settings are meant to be used if you need to restrict or switch off the Aggressive Reporting, which is an out of the box advanced feature to lint Testing Library usages in a simpler way for most of the users. So please before configuring any of these settings, read more about the advantages of eslint-plugin-testing-library Aggressive Reporting feature, and how it's affected by these settings.

If you are sure about configuring the settings, these are the options available:

$3

The name of your custom utility file from where you re-export everything from the Testing Library package, or "off" to switch related Aggressive Reporting mechanism off. Relates to Aggressive Imports Reporting.

`js
// .eslintrc.js
module.exports = {
settings: {
'testing-library/utils-module': 'my-custom-test-utility-file',
},
};
`

You can find more details about the utils-module setting here.

$3

A list of function names that are valid as Testing Library custom renders, or "off" to switch related Aggressive Reporting mechanism off. Relates to Aggressive Renders Reporting.

`js
// .eslintrc.js
module.exports = {
settings: {
'testing-library/custom-renders': ['display', 'renderWithProviders'],
},
};
`

You can find more details about the custom-renders setting here.

$3

A list of query names/patterns that are valid as Testing Library custom queries, or "off" to switch related Aggressive Reporting mechanism off. Relates to Aggressive Reporting - Queries

`js
// .eslintrc.js
module.exports = {
settings: {
'testing-library/custom-queries': ['ByIcon', 'getByComplexText'],
},
};
`

You can find more details about the custom-queries setting here.

$3

Since each Shared Setting is related to one Aggressive Reporting mechanism, and they accept "off" to opt out of that mechanism, you can switch the entire feature off by doing:

`js
// .eslintrc.js
module.exports = {
settings: {
'testing-library/utils-module': 'off',
'testing-library/custom-renders': 'off',
'testing-library/custom-queries': 'off',
},
};
`

Troubleshooting

$3

If you find ESLint errors related to eslint-plugin-testing-library in files other than testing, this could be caused by Aggressive Reporting.

You can avoid this by:

1. running eslint-plugin-testing-library` only against testing files
2. limiting the scope of Aggressive Reporting through Shared Settings
3. switching Aggressive Reporting feature off

If you think the error you are getting is not related to this at all, please fill a new issue with as many details as possible.

$3

If you are getting false positive ESLint errors in your testing files, this could be caused by Aggressive Reporting.

You can avoid this by:

1. limiting the scope of Aggressive Reporting through Shared Settings
2. switching Aggressive Reporting feature off

If you think the error you are getting is not related to this at all, please fill a new issue with as many details as possible.

Other documentation

- Semantic Versioning Policy

Contributors ✨

Thanks goes to these wonderful people (emoji key):

Mario Beltrán Alarcón 💻 📖 👀 ⚠️ 🚇 🐛 🚧	Thomas Lombart 💻 📖 👀 ⚠️ 🚇	Ben Monro 💻 📖 ⚠️	Nicola Molinari 💻 ⚠️ 📖 👀	Aarón García Hervás 📖	Matej Šnuderl 🤔 📖	Adrià Fontcuberta 💻 ⚠️
Jon Aldinger 📖	Thomas Knickman 💻 📖 ⚠️	Kevin Sullivan 📖	Jakub Jastrzębski 💻 📖 ⚠️	Nikolay Stoynov 📖	marudor 💻 ⚠️	Tim Deschryver 💻 📖 🤔 👀 ⚠️ 🐛 🚇 📦
Tobias Deekens 🐛	Victor Cordova 💻 ⚠️ 🐛	Dmitry Lobanov 💻 ⚠️	Kent C. Dodds 🐛	Gonzalo D'Elia 💻 ⚠️ 📖 👀	Jeff Rifwald 📖	Leandro Lourenci 🐛 💻 ⚠️
Miguel Erja González 🐛	Pavel Pustovalov 🐛	Jacob Parish 🐛 💻 ⚠️	Nick McCurdy 🤔 💻 👀	Stefan Cameron 🐛	Mateus Felix 💻 ⚠️ 📖	Renato Augusto Gama dos Santos 🤔 💻 📖 ⚠️
Josh Kelly 💻	Alessia Bellisario 💻 ⚠️ 📖	Spencer Miskoviak 💻 ⚠️ 📖 🤔	Giorgio Polvara 💻 ⚠️ 📖	Josh David 📖	Michaël De Boey 💻 📦 🚧 🚇 👀	Jian Huang 💻 ⚠️ 📖
Philipp Fritsche 💻	Tomas Zaicevas 🐛 💻 ⚠️ 📖	Gareth Jones 💻 📖 ⚠️ 🚧	HonkingGoose 📖 🚧	Julien Wajsberg 🐛 💻 ⚠️	Marat Dyatko 🐛 💻	David Tolman 🐛
Ari Perkkiö ⚠️	Diego Castillo 💻	Bruno Pinto 💻 ⚠️	themagickoala 💻 ⚠️	Prashant Ashok 💻 ⚠️	Ivan Aprea 💻 ⚠️	Dmitry Semigradsky 💻 ⚠️ 📖
Senja 💻 ⚠️ 📖	Breno Cota 💻 ⚠️	Nick Bolles 💻 ⚠️ 📖	Bryan Mishkin 📖 🔧	Nim G 📖	Patrick Ahmetovic 🤔 💻 ⚠️	Josh Justice 💻 ⚠️ 📖 🤔
Dale Karp 💻 ⚠️ 📖	Nathan 💻 ⚠️	justintoman 💻 ⚠️	Anthony Devick 💻 ⚠️ 📖	Richard Maisano 💻 ⚠️	Aleksei Androsov 💻 ⚠️	Nicolas Bonduel 📖
Alexey Ryabov 🚧	Jemi Salo 💻 ⚠️	nostro 💻	Daniel Rentz 📖	StyleShit 💻 ⚠️ 📖	Yukihiro Hasegawa 💻 ⚠️ 🤔	Charley Pugmire 💻 ⚠️
Andrew Kazakov 💻	Kevin Bon 💻 ⚠️	Atsushi Ishida 💻 ⚠️ 📖