atoum is a unit testing framework designed to be quick, simple and reliable when it comes to testing code developed in PHP.  Some of its features include:

– It is only one PHAR file, which makes it really easy to install

– Thanks to intelligent uses of anonymous functions and closures, stubbing implementation during tests is easier.

– Performs the execution of each unit test within a separate PHP process to warrant isolation.

– Boasts a reduced memory footprint while allowing for hastened test execution