https://github.com/l2beat/earl

☕ Ergonomic, modern and type-safe assertion library for TypeScript
https://github.com/l2beat/earl

assert assertion-libraries chai jest mocha testing typescript

Last synced: 28 days ago
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☕ Ergonomic, modern and type-safe assertion library for TypeScript

• Host: GitHub
• URL: https://github.com/l2beat/earl
• Owner: l2beat
• License: mit
• Created: 2020-05-05T20:00:16.000Z (over 4 years ago)
• Default Branch: main
• Last Pushed: 2024-06-25T07:13:43.000Z (5 months ago)
• Last Synced: 2024-10-09T15:33:24.253Z (about 1 month ago)
• Topics: assert, assertion-libraries, chai, jest, mocha, testing, typescript
• Language: TypeScript
• Homepage: https://earl.fun/
• Size: 2.22 MB
• Stars: 257
• Watchers: 6
• Forks: 19
• Open Issues: 12
• Metadata Files:
  • Readme: README.md
  • Contributing: CONTRIBUTING.md
  • License: LICENSE

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README

        
![Earl](https://raw.githubusercontent.com/l2beat/earl/master/gh-cover.png)



  
Ergonomic, modern and type-safe assertion library for TypeScript

  
Brings good parts of Jest back to good ol' Mocha

  


    

    

  


## Features

- 💪 Use advanced assertions that are able to match whole ranges of values

- 🤖 Written in TypeScript with type-safety in mind

- 🎭 Type-safe, fully integrated mocks included

- ☕ Finally a modern assertion library for Mocha

- 📸 Snapshots can be easily created and updated with Earl

- 🔌 Tweak to your needs with plugins

## Installation

```sh

npm install --save-dev earl

```

## Example

```typescript

import { expect } from 'earl'

const user = {

  name: 'John Doe',

  email: '[email protected]',

  notificationCount: 5,

}

// This code fails to compile, and TypeScript provides this useful

// error message:

// Property 'notificationCount' is missing in type

// '{ name: string; email: any; }' but required in type 'User'.

expect(user).toEqual({

  name: 'John Doe',

  email: expect.a(String),

})

```

## Docs

- [Getting started](https://earl.fun/introduction/getting-started.html)

- [API reference](https://earl.fun/api/api-reference.html)

# License

Published under the MIT License. Copyright © 2023 L2BEAT.