@testing-library/angular

Simple and complete Angular testing utilities that encourage good testing practices.

[**Read The Docs**](https://testing-library.com/angular) | [Edit the docs](https://github.com/testing-library/testing-library-docs)

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[![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://github.com/codespaces/new?hide_repo_select=true&ref=main&repo=137053739) ## Table of Contents - [Table of Contents](#table-of-contents) - [The problem](#the-problem) - [This solution](#this-solution) - [Example](#example) - [Installation](#installation) - [Version compatibility](#version-compatibility) - [Guiding Principles](#guiding-principles) - [Contributors](#contributors) - [Docs](#docs) - [FAQ](#faq) - [I am using Reactive Forms and the `jest-dom` matcher `toHaveFormValues` always returns an empty object or there are missing fields. Why?](#i-am-using-reactive-forms-and-the-jest-dom-matcher-tohaveformvalues-always-returns-an-empty-object-or-there-are-missing-fields-why) - [Issues](#issues) - [🐛 Bugs](#-bugs) - [💡 Feature Requests](#-feature-requests) - [❓ Questions](#-questions) - [Getting started with GitHub Codespaces](#getting-started-with-github-codespaces) - [LICENSE](#license) ## The problem You want to write maintainable tests for your Angular 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 `@testing-library/angular` is a very lightweight solution for testing Angular components. It provides light utility functions on top of `Angular` and `@testing-library/dom`, 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.][guiding-principle] ## Example counter.component.ts ```ts @Component({ selector: 'atl-counter', template: ` {{ hello() }} Current Count: {{ counter() }} `, }) export class CounterComponent { counter = model(0); hello = input('Hi', { alias: 'greeting' }); increment() { this.counter.set(this.counter() + 1); } decrement() { this.counter.set(this.counter() - 1); } } ``` counter.component.spec.ts ```typescript import { render, screen, fireEvent, aliasedInput } from '@testing-library/angular'; import { CounterComponent } from './counter.component'; describe('Counter', () => { it('should render counter', async () => { await render(CounterComponent, { inputs: { counter: 5, // aliases need to be specified this way ...aliasedInput('greeting', 'Hello Alias!'), }, }); expect(screen.getByText('Current Count: 5')).toBeVisible(); expect(screen.getByText('Hello Alias!')).toBeVisible(); }); it('should increment the counter on click', async () => { await render(CounterComponent, { inputs: { counter: 5 } }); const incrementButton = screen.getByRole('button', { name: '+' }); fireEvent.click(incrementButton); expect(screen.getByText('Current Count: 6')).toBeVisible(); }); }); ``` [See more examples](https://github.com/testing-library/angular-testing-library/tree/main/apps/example-app/src/app/examples) ## Installation This module is distributed via [npm][npm] which is bundled with [node][node] and should be installed as one of your project's `devDependencies`. Starting from ATL version 17, you also need to install `@testing-library/dom`: ```bash npm install --save-dev @testing-library/angular @testing-library/dom ``` Or, you can use the `ng add` command. This sets up your project to use Angular Testing Library, which also includes the installation of `@testing-library/dom`. ```bash ng add @testing-library/angular ``` You may also be interested in installing `jest-dom` so you can use [the custom jest matchers](https://github.com/testing-library/jest-dom#readme). > [**Docs**](https://testing-library.com/angular) ## Version compatibility | Angular | Angular Testing Library | | ------- | ---------------------------------- | | 21.x | 19.x | | 20.x | 18.x, 17.x, 16.x, 15.x, 14.x, 13.x | | 19.x | 17.x, 16.x, 15.x, 14.x, 13.x | | 18.x | 17.x, 16.x, 15.x, 14.x, 13.x | | 17.x | 17.x, 16.x, 15.x, 14.x, 13.x | | 16.x | 14.x, 13.x | | >= 15.1 | 14.x, 13.x | | < 15.1 | 12.x, 11.x | | 14.x | 12.x, 11.x | ## Guiding Principles > [The more your tests resemble the way your software is used, the more > confidence they can give you.][guiding-principle] We try to only expose methods and utilities that encourage you to write tests that closely resemble how your Angular 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 Angular components or full Angular applications. 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][emojis]):

_{Tim Deschryver} 💻 📖 🚇 ⚠️	_{Michaël De Boey} 📖	_{Ignacio Le Fluk} 💻 ⚠️	_{Tamás Szabó} 💻	_{Gregor Woiwode} 💻	_{Toni Villena} 🐛 💻 📖 ⚠️	_ShPelles 📖
_Miluoshi 💻 ⚠️	_{Nick McCurdy} 📖	_{Srinivasan Sekar} 📖	_Bitcollage 📖	_{Emil Sundin} 💻	_Ombrax 💻	_{Rafael Santana} 💻 ⚠️ 🐛
_{Benjamin Blackwood} 📖 ⚠️	_{Gustavo Porto} 📖	_{Bo Vandersteene} 💻	_Janek 💻 ⚠️	_{Gleb Irovich} 💻 ⚠️	_Arjen 💻 🚧	_{Suguru Inatomi} 💻 🤔
_{Amit Miran} 🚇	_{Jan-Willem Willebrands} 💻	_Sandro 💻 🐛	_{Michael Westphal} 💻 ⚠️	_Lukas 💻	_{Matan Borenkraout} 🚧	_mleimer 📖 ⚠️
_MeIr 🐛 ⚠️	_{John Dengis} 💻 ⚠️	_{Rokas Brazdžionis} 💻	_{Mateus Duraes} 💻	_{Josh Joseph} 💻 ⚠️	_{Torsten Knauf} 🚧	_{antischematic} 🐛 🤔
_{Florian Pabst} 💻	_{Mark Goho} 🚧 📖	_{Jan-Willem Baart} 💻 ⚠️	_{S. Mumenthaler} 💻 ⚠️	_{Andrei Alecu} 💻 🤔 📖	_{Daniel Ramírez Barrientos} 💻	_{Mahdi Lazraq} 💻 ⚠️
_{Arthur Petrie} 💻	_{Fabien Dehopré} 💻	_{Jamie Vereecken} 💻	_Christian24 💻 👀	_{Michal Štrajt} 💻 🐛	_{J. Degand} 💻	_{Maksim Popov} 💻
_MattijsE 💻	_{Jonas Kuske} 💻

This project follows the [all-contributors][all-contributors] specification. Contributions of any kind welcome! ## Docs [**Read The Docs**](https://testing-library.com/angular) | [Edit the docs](https://github.com/testing-library/testing-library-docs) ## FAQ ### I am using Reactive Forms and the `jest-dom` matcher `toHaveFormValues` always returns an empty object or there are missing fields. Why? Only form elements with a `name` attribute will have their values passed to `toHaveFormsValues`. ## Issues _Looking to contribute? Look for the [Good First Issue][good-first-issue] label._ ### 🐛 Bugs Please file an issue for bugs, missing documentation, or unexpected behavior. [**See Bugs**][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**][requests] ### ❓ Questions For questions related to using the library, please visit a support community instead of filing an issue on GitHub. - [Discord][discord] - [Stack Overflow][stackoverflow] ## Getting started with GitHub Codespaces To get started, create a codespace for this repository by clicking this 👇 [![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://github.com/codespaces/new?hide_repo_select=true&ref=main&repo=137053739) A codespace will open in a web-based version of Visual Studio Code. The [dev container](.devcontainer/devcontainer.json) is fully configured with software needed for this project. **Note**: Dev containers is an open spec which is supported by [GitHub Codespaces](https://github.com/codespaces) and [other tools](https://containers.dev/supporting). ## LICENSE MIT [npm]: https://www.npmjs.com/ [node]: https://nodejs.org [build-badge]: https://github.com/testing-library/angular-testing-library/actions/workflows/ci.yml/badge.svg [build]: https://github.com/testing-library/angular-testing-library/actions/workflows/ci.yml [version-badge]: https://img.shields.io/npm/v/@testing-library/angular.svg?style=flat-square [package]: https://www.npmjs.com/package/@testing-library/angular [downloads-badge]: https://img.shields.io/npm/dm/@testing-library/angular.svg?style=flat-square [npmtrends]: http://www.npmtrends.com/@testing-library/angular [discord-badge]: https://img.shields.io/discord/723559267868737556.svg?color=7389D8&labelColor=6A7EC2&logo=discord&logoColor=ffffff&style=flat-square [discord]: https://discord.gg/testing-library [license-badge]: https://img.shields.io/npm/l/@testing-library/angular.svg?style=flat-square [license]: https://github.com/testing-library/angular-testing-library/blob/main/LICENSE [prs-badge]: https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square [prs]: http://makeapullrequest.com [donate-badge]: https://img.shields.io/badge/$-support-green.svg?style=flat-square [coc-badge]: https://img.shields.io/badge/code%20of-conduct-ff69b4.svg?style=flat-square [coc]: https://github.com/testing-library/angular-testing-library/blob/main/CODE_OF_CONDUCT.md [github-watch-badge]: https://img.shields.io/github/watchers/testing-library/angular-testing-library.svg?style=social [github-watch]: https://github.com/testing-library/angular-testing-library/watchers [github-star-badge]: https://img.shields.io/github/stars/testing-library/angular-testing-library.svg?style=social [github-star]: https://github.com/testing-library/angular-testing-library/stargazers [twitter]: https://twitter.com/intent/tweet?text=Check%20out%20🦔%20@testing-library/angular%20by%20%40tim_deschryver%20https%3A%2F%2Fgithub.com%2F@testing-library/angular [twitter-badge]: https://img.shields.io/twitter/url/https/github.com/testing-library/angular-testing-library.svg?style=social [emojis]: https://github.com/all-contributors/all-contributors#emoji-key [all-contributors]: https://github.com/all-contributors/all-contributors [set-immediate]: https://developer.mozilla.org/en-US/docs/Web/API/Window/setImmediate [guiding-principle]: https://twitter.com/kentcdodds/status/977018512689455106 [bugs]: https://github.com/testing-library/angular-testing-library/issues?q=is%3Aissue+is%3Aopen+label%3Abug+sort%3Acreated-desc [requests]: https://github.com/testing-library/angular-testing-library/issues?q=is%3Aissue+sort%3Areactions-%2B1-desc+label%3Aenhancement+is%3Aopen [good-first-issue]: https://github.com/testing-library/angular-testing-library/issues?utf8=✓&q=is%3Aissue+is%3Aopen+sort%3Areactions-%2B1-desc+label%3A"good+first+issue"+ [stackoverflow]: https://stackoverflow.com/questions/tagged/angular-testing-library [contributors-badge]: https://img.shields.io/badge/all_contributors-1-orange.svg?style=flat-square

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