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karma2,801,47011,955534 kB3794 months agoMIT
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karma is a popular test runner for JavaScript applications, designed to work seamlessly with various testing frameworks and libraries. It allows developers to run tests in real browsers, providing a reliable way to ensure that code behaves as expected across different environments. Karma is particularly useful for continuous integration and testing workflows, as it can automatically run tests whenever code changes are made. While Karma is a powerful tool for testing, there are several alternatives available that cater to different testing needs. Here are a few notable options:

  • jasmine is a behavior-driven development (BDD) framework for testing JavaScript code. It provides a clean syntax for writing tests and includes built-in support for spies, mocks, and assertions. Jasmine is often used for unit testing and is known for its simplicity and ease of use. If you prefer a straightforward testing framework without the need for a test runner, Jasmine is a solid choice.

  • jest is a widely-used testing framework developed by Facebook, designed primarily for testing React applications. It comes with a built-in test runner, assertion library, and mocking capabilities, making it a comprehensive solution for unit and integration testing. Jest is known for its speed and ease of setup, and it includes features like snapshot testing and code coverage out of the box. If you are looking for an all-in-one testing solution, Jest is an excellent option.

  • mocha is a flexible testing framework that allows developers to choose their assertion libraries and mocking tools. It supports asynchronous testing and provides a variety of reporting options. Mocha is often used in combination with other libraries, such as Chai for assertions and Sinon for spies and mocks. If you prefer a customizable testing environment, Mocha is a great choice.

  • protractor is an end-to-end testing framework specifically designed for Angular applications. It integrates with Selenium WebDriver to automate browser interactions, allowing developers to write tests that simulate user behavior in a real browser environment. Protractor is ideal for testing Angular applications, but it can also be used with other frameworks. If you are focused on end-to-end testing, especially for Angular apps, Protractor is a suitable option.

To see how Karma compares with Jasmine, Jest, Mocha, and Protractor, check out the comparison: Comparing jasmine vs jest vs karma vs mocha vs protractor.

README for karma

Karma

js-standard-style npm version npm downloads

Code Climate PRs Welcome Dependency Status devDependency Status semantic-release

A simple tool that allows you to execute JavaScript code in multiple real browsers.

The main purpose of Karma is to make your test-driven development easy, fast, and fun.

Karma is deprecated and is not accepting new features or general bug fixes.

The web testing space has evolved significantly in the 10+ years since Karma's creation. The web landscape looks very different today and new patterns and tools have emerged in the ecosystem. New test runners offer more performant alternatives, and Karma no longer provides clear unique value.

Based on the current state of the web testing ecosystem, we have made the hard decision to deprecate Karma.

We know Karma is used particularly commonly in the Angular ecosystem, so Angular is adding Jest and Web Test Runner support to provide a migration path off of Karma. See the Angular blog for more details.

Critical security issues in Karma will still be triaged and fixed as necessary. This will continue until 12 months after Angular CLI's Web Test Runner support is marked stable.

For those outside Angular looking to migrate off Karma, both Web Test Runner and jasmine-browser-runner provide browser-based unit testing solutions which can be used as a direct alternative. Jest and Vitest also provide Node-based alternatives.

It has been incredible to see Karma's impact on the web testing ecosystem and we greatly appreciate the support of everyone who contributed to an awesome community. Keep testing. ✅

Help and Support

For questions and support please use the mailing list or Gitter. The issue tracker is for bug reports and feature discussions only.

When should I use Karma?

  • You want to test code in real browsers.
  • You want to test code in multiple browsers (desktop, mobile, tablets, etc.).
  • You want to execute your tests locally during development.
  • You want to execute your tests on a continuous integration server.
  • You want to execute your tests on every save.
  • You love your terminal.
  • You don't want your (testing) life to suck.
  • You want to use Istanbul to automagically generate coverage reports.
  • You want to use RequireJS for your source files.

But I still want to use _insert testing library_

Karma is not a testing framework, nor an assertion library. Karma just launches an HTTP server, and generates the test runner HTML file you probably already know from your favourite testing framework. So for testing purposes you can use pretty much anything you like. There are already plugins for most of the common testing frameworks:

If you can't find an adapter for your favourite framework, don't worry and write your own. It's not that hard and we are here to help.

Which Browsers can I use?

All the major browsers are supported, if you want to know more see the browsers page.

Troubleshooting

See FAQ.

I want to use it. Where do I sign?

You don't need to sign anything but here are some resources to help you to get started...

Obligatory Screencast.

Every serious project has a screencast, so here is ours. Just click here and let the show begin.

Installation.

See installation.

Using it.

See configuration.

This is so great. I want to help.

Please, see contributing.

Why did you create this?

Throughout the development of AngularJS, we've been using JSTD for testing. I really think that JSTD is a great idea. Unfortunately, we had many problems with JSTD, so we decided to write our own test runner based on the same idea. We wanted a simple tool just for executing JavaScript tests that is both stable and fast. That's why we use the awesome Socket.io library and Node.js.

My boss wants a license. So where is it?

MIT License

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