How often do you see PHP projects with no line of test written? From my experience, this situation happens quite often. We should state the unpleasant fact that tests are not so popular around the PHP world. Surely, the advanced developers with 5+ years of experience in PHP and other programming languages understand importance of testing and PHPUnit usage. But juniors and seniors are just skipping testing and, therefore, produce unstable web applications.
A code example of the framework in use is included in the post - a test on a class using methods like "wantTo", "amOnPage", "fillField" and "click". The installation is pretty simple and it gives you a quick way to start working on acceptance, functional and unit tests. In BDD fashion, the tests are written in a more "natural language" than traditional unit tests making them easier for the non-developers (like QA) to write. Their example loads a page, fills in some form fields and submits the form to check the result.