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QUnit - A JavaScript Unit Testing framework.
QUnit is a powerful, easy-to-use, JavaScript test suite. It's used by the jQuery project to test its code and plugins but is capable of testing any generic JavaScript code (and even capable of testing JavaScript code on the server-side).
QUnit is especially useful for regression testing: Whenever a bug is reported, write a test that asserts the existence of that particular bug. Then fix it and commit both. Every time you work on the code again, run the tests. If the bug comes up again - a regression - you'll spot it immediately and know how to fix it, because you know what code you just changed.
Having good unit test coverage makes safe refactoring easy and cheap. You can run the tests after each small refactoring step and always know what change broke something.
QUnit is similar to other unit testing frameworks like JUnit, but makes use of the features JavaScript provides and helps with testing code in the browser, e.g. with its stop/start facilities for testing asynchronous code.
If you are interested in helping developing QUnit, you are in the right place. For related discussions, visit the QUnit and Testing forum.
Planning for a qunitjs.com site and other testing tools related work now happens on the jQuery Testing Team planning wiki.
Development
To submit patches, fork the repository, create a branch for the change. Then implement
the change, run grunt to lint and test it, then commit, push and create a pull request.
Include some background for the change in the commit message and Fixes #nnn, referring
to the issue number you're addressing.
To run grunt, you need node and npm, then npm install grunt -g. That gives you a global
grunt binary. For additional grunt tasks, also run npm install.
Releases
Install git-extras and run git changelog to update History.md.
Update qunit/qunit.js|css and package.json to the release version, commit and
tag, update them again to the next version, commit and push commits and tags
(git push --tags origin master).
Put the 'v' in front of the tag, e.g. v1.8.0. Clean up the changelog, removing merge commits
or whitespace cleanups.
To upload to code.jquery.com (replace $version accordingly):
scp -q qunit/qunit.js jqadmin@code.origin.jquery.com:/var/www/html/code.jquery.com/qunit/qunit-$version.js
scp -q qunit/qunit.css jqadmin@code.origin.jquery.com:/var/www/html/code.jquery.com/qunit/qunit-$version.css
Then update /var/www/html/code.jquery.com/index.html and purge it with:
curl -s http://code.origin.jquery.com/?reload