Currently to run zentest on rails you have to jump through some extra hoops. This is because you need to require config/environment to get the magic const loader. BUT, because that maps ClassName to class_name.rb, you also have to load app/controllersapplication.rb (because the class inside is ApplicationController, not Application):
ruby -I.:lib:test -r ./config/environment.rb -r app/controllers/application.rb \ -S zentest -r app/controllers/groups_controller.rb \ test/functional/groups_controller_test.rb
I've got some unreleased changes that should make it as easy as:
zentest -r app/controllers/groups_controller.rb \ test/functional/groups_controller_test.rb
