However, at this moment, TestSwarm is still in alpha testing.

NOTE: “During this alpha period data may be lost or corrupted and clients may be unexpectedly disconnected.”

The TestSwarm project was initially started by John Resig as a tool to support the jQuery project and it later moved to become an official Mozilla Labs project. According to John, one of the main reasons on why he pursued this project is because the present day’s cross browser Javascript testing methods do not scale. TestSwarm is expected to greatly simplify the complicated and time-consuming process of running JavaScript test suites in multiple browsers.

TestSwarm currently supports 7 operating systems (Windows, Mac OS X and Linux) and runs its tests on all the major browsers from Mozilla to Konqueror. TestSwarm provides a great visual interface to display the test results. Detailed data about what exactly went wrong is provided which helps to rectify the problem too. This makes a developer’s job easier to keep JavaScript libraries compatible with most web browsers.

Currently, TestSwarm is provided as a service to test few popular JavaScript libraries including jQuery, YUI, Dojo, MooTools, and Prototype. You can also download the source code and install TestSwarm on your own servers if you want to use it for your own project.

To know more, watch this screencast on how TestSwarm works. Additional information is available on John’s blog and the TestSwarm site.