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eslint-plugin-testing-library

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eslint-plugin-testing-library

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


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What is eslint-plugin-testing-library?

The eslint-plugin-testing-library package is an ESLint plugin that provides linting rules for writing tests with the Testing Library, which is a set of utilities for testing UI components in a user-centric way. This plugin helps enforce best practices and eliminate common mistakes when writing tests with Testing Library.

What are eslint-plugin-testing-library's main functionalities?

Enforce consistent usage of Testing Library queries

This rule enforces the use of the `screen` object for querying DOM elements, which provides better consistency and avoids destructuring render result.

/* eslint testing-library/prefer-screen-queries: 'error' */
// Bad
const { getByText } = render(<App />);
getByText('Hello World');

// Good
const screen = render(<App />);
screen.getByText('Hello World');

Avoid using container methods

This rule prevents direct DOM manipulation by avoiding the use of the `container` method, encouraging the use of queries provided by Testing Library instead.

/* eslint testing-library/no-container: 'error' */
// Bad
const { container } = render(<App />);
container.querySelector('.my-class');

// Good
const { getByClassName } = render(<App />);
getByClassName('my-class');

Ensure async queries are awaited

This rule ensures that asynchronous queries like `findBy*` are properly awaited or returned in tests, which is necessary for correct test execution.

/* eslint testing-library/await-async-query: 'error' */
// Bad
getByText('Loading...');

// Good
await findByText('Loaded');

Prevent the use of debug

This rule warns or errors when the `debug` function is used, as it's intended for debugging purposes and should not be left in the final test code.

/* eslint testing-library/no-debug: 'warn' */
// Bad
const { debug } = render(<App />);
debug();

// Good
// No debug usage

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Package last updated on 11 Aug 2024

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