I don't understand whether they're testing simple servlet containers (where's Resin, Winstone, Java 6's built-in web server, etc?) or entire J2EE stacks (where'

I don't understand whether they're testing simple servlet containers (where's Resin, Winstone, Java 6's built-in web server, etc?) or entire J2EE stacks (where's Resin, Geronimo, Jonas, etc?).