That middle part is where the tests run. On Careers for example we have a decent set of Selenium tests that run through the core functionality of the site on ev

That middle part is where the tests run. On Careers for example we have a decent set of Selenium tests that run through the core functionality of the site on every dev build (Can I Login? Can I buy something? Can I post a job? If I have a profile and I go to the profile page is it there? type stuff).