eslint-plugin-testing-library

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

Installation

You'll first need to install ESLint:

$ npm i eslint --save-dev

Next, install eslint-plugin-testing-library:

$ npm install eslint-plugin-testing-library --save-dev

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

Usage

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

{
  "plugins": ["testing-library"]
}

Then configure the rules you want to use under the rules section.

{
  "rules": {
    "testing-library/await-async-query": "error",
    "testing-library/no-await-sync-query": "error",
    "testing-library/no-debug": "warn"
  }
}

Shareable configurations

Frameworks

Starting from the premise that DOM Testing Library is the base for the rest of Testing Library frameworks wrappers, this plugin also exports different configuration for those frameworks that enforces good practices for specific rules that only apply to them (you can find more info about enabled rules in Supported Rules section within Frameworks column).

Note that frameworks configurations enable their specific rules + recommended rules.

Available frameworks configurations are:

Angular

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

{
  "extends": ["plugin:testing-library/angular"]
}

React

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

{
  "extends": ["plugin:testing-library/react"]
}

Vue

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

{
  "extends": ["plugin:testing-library/vue"]
}

Supported Rules

Rule	Description	Configurations	Fixable
await-async-query	Enforce async queries to have proper `await`
await-fire-event	Enforce async fire event methods to be awaited
no-await-sync-query	Disallow unnecessary `await` for sync queries
no-debug	Disallow the use of `debug`
no-dom-import	Disallow importing from DOM Testing Library
prefer-expect-query-by	Disallow the use of `expect(getBy*)`
prefer-explicit-assert	Suggest using explicit assertions rather than just `getBy*` queries