It is a PHP unit test and web test framework. Users of Junit will be familiar with most of the interface. The JwebUnit style functionality is more complete now. It has support for SSL, forms, frames, proxies and basic authentication. The idea is that common but fiddly PHP tasks, such as logging into a site, can be tested easily.
Platform: Cross-platform; License: GNU Library or Lesser General Public License (LGPL)
Reference: https://www.simpletest.org/