Unit Testing allows developers to test that a unit of code still functions properly after a change. Currently Unit Testing in Joomla is being switched to the PHPUnit framework, however most code lacks any Unit Testing. A few of the major benefits for Joomla from Unit Testing include:

• Highlight cases where minor changes cause unexpected breakage.
• Specify how a class should behave.
• Expose design flaws early in development.
• Serve as examples, and help developers understand how to use code as well as what the code is expected to do