Testing apps with HTTP authentication AND redirection

Hello, does anybody know how can I test a controller in a Rails app (using the Rails testing framework) that requires HTTP authentication, and redirects after that?

With integration (I mean, using UserFlowsTest < ActionController::IntegrationTest) tests I know I can follow_redirect! , but I don't know how to do the authentication.

With inheriting the test class from ActionController::TestCase won't give me the follow_redirect! method. You see, I know how to authenticate in this case, but can't folllow redirections.

I found some interesting links, but they weren't enough: http://flip.netzbeben.de/2008/06/functional-test-for-http-authentication-in-rails-2/

Any help would be great!