From the Zend Developer Zone, there's a tutorial covering acceptance testing of web applications, specifically using PHPUnit and Selenium.

In this article I introduce the topic of Acceptance Testing (aka Functional Testing), something more PHP programmers should be starting to practice. I'm sure many of us are well aware of Unit Testing and even Integration Testing so where does this third wheel come into play for web applications given our growing obsession with Web 2.0 and AJAX and how does it differ from the former two practices? Below I'll explain this.

They start by asking "Why acceptance testing?" at all with an answer of "it's not about isolated testing, but testing as a whole". The rest of the article is broken up into several parts:

• Of User Stories and Acceptance Tests
• The Iteration Plan
• Preparing For Acceptance Testing (setting up PHPUnit and Selenium)
• Writing And Running The Acceptance Tests
• How to run the tests

In their example they show how to validate that a login on the site works as expected (including interacting with a form on the page).