vfsStream : vfsStream is a stream wrapper for a virtual file system that may be helpful in unit tests to mock the real file system. It can be used with any unit t...
Mockery : Mockery is a simple yet flexible PHP mock object framework for use in unit testing with PHPUnit, PHPSpec or any other testing framework. Its core goal...
testify : Go code (golang) set of packages that provide many tools for testifying that your code will behave as you intend.
Text_Highlighter : Provides functionality to perform syntax highlighting for different file formats.
TCPDF : TCPDF is a FLOSS PHP class for generating PDF documents.
PHPUnit is the de-facto standard for unit testing in PHP projects. It provides both a framework that makes the writing of tests easy as well as the functionality to easily run the tests and analyse their results.