First, possibly add pod doc on how to use cookies within A-T using Michaels solution of
Apache::TestRequest::user_agent( cookie_jar => {});
and possibly others. I would also probably take a stab at getting some of the other things in http://perl.apache.org/docs/general/testing/testing.html into the pod; specifically the use of the secondary param in the GET request to add outgoing headers and the like.
Second, add some sort of cookie tests to the A-T test suit. I'm not quite sure what a test would be for other than to verify that A-T using LWP actually receives and sends cookies and verifies they get remembered between requests. But that seems more like testing LWP and A-T to me.
My first thoughts are to keep it as simple as possible and check for mod_usertrack. It it's there, ensure the first tracking cookie value is maintained across multiple requests.
Any thoughts?
-=Chris