functional-test plugin is broken in Grails 1.3.x versions

Got around to write some functional tests for the Grails app i'm working on. "Grails in Action" book recommends functional-test plugin, and it looks like it's pretty popular in the community, but it appears that it doesn't work for Grails 1.3.x versions. And since grails-plugins code hasn't been touched since July, it only makes sense to switch to something else at the moment.