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  • License
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  • Created over 6 years ago
  • Updated about 1 year ago

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Repository Details

๐Ÿฆ” Simple and complete Angular testing utilities that encourage good testing practices

@testing-library/angular

hedgehog

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


Read The Docs | Edit the docs



Build Status version downloads MIT License

All Contributors PRs Welcome Code of Conduct Discord

Watch on GitHub Star on GitHub Tweet

Open in GitHub Codespaces

Table of Contents

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.

Example

counter.component.ts

@Component({
  selector: 'counter',
  template: `
    <button (click)="decrement()">-</button>
    <span>Current Count: {{ counter }}</span>
    <button (click)="increment()">+</button>
  `,
})
export class CounterComponent {
  @Input() counter = 0;

  increment() {
    this.counter += 1;
  }

  decrement() {
    this.counter -= 1;
  }
}

counter.component.spec.ts

import { render, screen, fireEvent } from '@testing-library/angular';
import { CounterComponent } from './counter.component.ts';

describe('Counter', () => {
  test('should render counter', async () => {
    await render(CounterComponent, { componentProperties: { counter: 5 } });

    expect(screen.getByText('Current Count: 5'));
  });

  test('should increment the counter on click', async () => {
    await render(CounterComponent, { componentProperties: { counter: 5 } });

    const incrementButton = screen.getByRole('button', { name: /increment/i });
    fireEvent.click(incrementButton);

    expect(screen.getByText('Current Count: 6'));
  });
});

See more examples

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 @testing-library/angular --save-dev

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

Docs

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 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):

Tim Deschryver
Tim Deschryver

๐Ÿ’ป ๐Ÿ“– ๐Ÿš‡ โš ๏ธ
Michaรซl De Boey
Michaรซl De Boey

๐Ÿ“–
Ignacio Le Fluk
Ignacio Le Fluk

๐Ÿ’ป โš ๏ธ
Tamรกs Szabรณ
Tamรกs Szabรณ

๐Ÿ’ป
Gregor Woiwode
Gregor Woiwode

๐Ÿ’ป
Toni Villena
Toni Villena

๐Ÿ› ๐Ÿ’ป ๐Ÿ“– โš ๏ธ
ShPelles
ShPelles

๐Ÿ“–
Miluoshi
Miluoshi

๐Ÿ’ป โš ๏ธ
Nick McCurdy
Nick McCurdy

๐Ÿ“–
Srinivasan Sekar
Srinivasan Sekar

๐Ÿ“–
Bitcollage
Bitcollage

๐Ÿ“–
Emil Sundin
Emil Sundin

๐Ÿ’ป
Ombrax
Ombrax

๐Ÿ’ป
Rafael Santana
Rafael Santana

๐Ÿ’ป โš ๏ธ ๐Ÿ›
Benjamin Blackwood
Benjamin Blackwood

๐Ÿ“– โš ๏ธ
Gustavo Porto
Gustavo Porto

๐Ÿ“–
Bo Vandersteene
Bo Vandersteene

๐Ÿ’ป
Janek
Janek

๐Ÿ’ป โš ๏ธ
Gleb Irovich
Gleb Irovich

๐Ÿ’ป โš ๏ธ
Arjen
Arjen

๐Ÿ’ป ๐Ÿšง
Suguru Inatomi
Suguru Inatomi

๐Ÿ’ป ๐Ÿค”
Amit Miran
Amit Miran

๐Ÿš‡
Jan-Willem Willebrands
Jan-Willem Willebrands

๐Ÿ’ป
Sandro
Sandro

๐Ÿ’ป ๐Ÿ›
Michael Westphal
Michael Westphal

๐Ÿ’ป โš ๏ธ
Lukas
Lukas

๐Ÿ’ป
Matan Borenkraout
Matan Borenkraout

๐Ÿšง
mleimer
mleimer

๐Ÿ“– โš ๏ธ
MeIr
MeIr

๐Ÿ› โš ๏ธ
John Dengis
John Dengis

๐Ÿ’ป โš ๏ธ
Rokas Brazdลพionis
Rokas Brazdลพionis

๐Ÿ’ป
Mateus Duraes
Mateus Duraes

๐Ÿ’ป
Josh Joseph
Josh Joseph

๐Ÿ’ป โš ๏ธ
Torsten Knauf
Torsten Knauf

๐Ÿšง
antischematic
antischematic

๐Ÿ› ๐Ÿค”
Florian Pabst
Florian Pabst

๐Ÿ’ป
Mark Goho
Mark Goho

๐Ÿšง ๐Ÿ“–

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

Docs

Read The Docs | Edit the 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 label.

๐Ÿ› Bugs

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

See Bugs

๐Ÿ’ก Feature Requests

Please file an issue to suggest new features. Vote on feature requests by adding a ๐Ÿ‘. This helps maintainers prioritize what to work on.

See Feature Requests

โ“ Questions

For questions related to using the library, please visit a support community instead of filing an issue on GitHub.

Getting started with GitHub Codespaces

To get started, create a codespace for this repository by clicking this ๐Ÿ‘‡

Open in GitHub Codespaces

A codespace will open in a web-based version of Visual Studio Code. The dev container is fully configured with software needed for this project.

Note: Dev containers is an open spec which is supported by GitHub Codespaces and other tools.

LICENSE

MIT

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