WordPress test framework has been refactored and now support autoloading via Composer. Still experimental.
[READ-ONLY] Simple HTTP smoke testing for your Symfony application
A source files for WordPress plugin testing tutorial.
HTTP Smoke Testing for your Slim Framework based application
Smoke testing library using PHPUnit and Goutte
Model and controller PHPUnit test helpers for Laravel
Supercharge your app or SDK with a testing library specifically for Guzzle