Unit.js

Flexible Unit Testing & Assertion Library for Javascript

Free

Description

Unit.js is an open source assertion library developed for Javascript applications, enabling developers to write and automate unit tests for both Node.js and browser environments. With a short learning curve and comprehensive documentation, it is designed to integrate with a wide range of test runners and frameworks, including Mocha, Jasmine, and Karma.

The library features multiple assertion interfaces—fluent, Assert, Should, and Must—allowing users to adopt their preferred style. Extensibility is supported through an easy-to-use plugin system and built-in dependency injection, making it highly flexible for structuring complex test suites. Developers can also generate spec documentation from their tests in various formats.

Key Features

Multi-interface support: Fluent style, Assert, Must, and Should assertion styles
Node.js and browser compatibility: Runs in both client and server environments
Plugin extensibility: Easily extend functionality with a plugin system
Dependency injection: Built-in support for managing dependencies in tests
Test runner agnostic: Integrates with Mocha, Jasmine, Karma, Protractor, QUnit, and more
Open source: Freely available with source hosted on GitHub
Spec doc generator: Automatically generate API documentation from unit tests