JsUnit is an open source Unit Testing framework for client-side (in-browser) JavaScript

JavaScript

JavaScript is a prototype-based scripting language that is dynamic, weakly typed and has first-class functions. It is a multi-paradigm language, supporting object-oriented, imperative, and functional programming styles....

. It is essentially a port of JUnit to JavaScript. Also included is a platform for automating the execution of tests on multiple browsers and multiple machines running different OSs. Its development began in January 2001.

JsUnit uses exception handling, which means we need JavaScript 1.4 or higher. That means that the browsers supported are Internet Explorer

Internet Explorer

Windows Internet Explorer is a series of graphical web browsers developed by Microsoft and included as part of the Microsoft Windows line of operating systems, starting in 1995. It was first released as part of the add-on package Plus! for Windows 95 that year...

 5.0 or later, Netscape

Netscape

Netscape Communications is a US computer services company, best known for Netscape Navigator, its web browser. When it was an independent company, its headquarters were in Mountain View, California...

 6.0 or later, Mozilla

Mozilla

Mozilla is a term used in a number of ways in relation to the Mozilla.org project and the Mozilla Foundation, their defunct commercial predecessor Netscape Communications Corporation, and their related application software....

 0.9 or later, and Konqueror

Konqueror

Not to be confused with the Conqueror web browser.Konqueror is a web browser and file manager that provides file-viewer functionality for file systems such as local files, files on a remote ftp server and files in a disk image. It is a core part of the KDE desktop environment...

 5.0 or later. The latest version of JsUnit has been tested for:

• Internet Explorer 5.5 and later, on Windows NT
  Windows NT
  Windows NT is a family of operating systems produced by Microsoft, the first version of which was released in July 1993. It was a powerful high-level-language-based, processor-independent, multiprocessing, multiuser operating system with features comparable to Unix. It was intended to complement...
  
  , Windows 2000
  Windows 2000
  Windows 2000 is a line of operating systems produced by Microsoft for use on personal computers, business desktops, laptops, and servers. Windows 2000 was released to manufacturing on 15 December 1999 and launched to retail on 17 February 2000. It is the successor to Windows NT 4.0, and is the...
  
  , Windows XP
  Windows XP
  Windows XP is an operating system produced by Microsoft for use on personal computers, including home and business desktops, laptops and media centers. First released to computer manufacturers on August 24, 2001, it is the second most popular version of Windows, based on installed user base...
  
  , Windows 95
  Windows 95
  Windows 95 is a consumer-oriented graphical user interface-based operating system. It was released on August 24, 1995 by Microsoft, and was a significant progression from the company's previous Windows products...
  
  , Mac OS 9
  Mac OS 9
  Mac OS 9 is the final major release of Apple's Mac OS before the launch of Mac OS X. Introduced on October 23, 1999, Apple positioned it as "The Best Internet Operating System Ever," highlighting Sherlock 2's Internet search capabilities, integration with Apple's free online services known as...
  
  , Mac OS X
• Internet Explorer 5.0 and later on Mac OS 9 and Mac OS X
• Mozilla 0.9.4 and later on all platforms (includes all Gecko
  Gecko
  Geckos are lizards belonging to the infraorder Gekkota, found in warm climates throughout the world. They range from 1.6 cm to 60 cm....
  
  -based browsers including Firefox 0.9 and later, Netscape 6.2.3 and later)
• Konqueror 5 and later on KDE 3.0.1 (Linux)

To run the server component of JsUnit, you will need a Java VM.