ActionController::TestRequest bug?

Hi, while starting to setup functional tests for my application I
received the following error:

NoMethodError: undefined method `server_name’ for
#<ActionController::TestRequest

which is coming from an instance variable I’m setting up in my
application controller.

@domain = Domain.find_or_create_by_name(request.server_name)

I’m using rails 2.0.2, any guidance would be appreciated.