Faker is a PHP library that generates fake data for you
The PHP Unit Testing framework.
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 is to offer a test double framework with a succinct API capable of clearly defining all possible object operations and interactions using a human readable Domain Specific Language (DSL).
PHP Hamcrest implementation [Official]
Library that provides collection, processing, and rendering functionality for PHP code coverage information.
[Package] Laravel Testing Helper for Packages Development
Thin assertion library for use in libraries and business-model
Assertions to validate method input/output with nice error messages.
Full-stack testing PHP framework