The StrutsTestCase library is now on the roap map for inclusion in the Struts 1.2.x release. You can check it out here:
http://jakarta.apache.org/struts/status.html#struts_1_2
I don't know any details, nor do I know when it will happen, but I think this is a good thing. Better integration means better tests, so I'm looking forward to the transition.
And as always, thanks to everyone for the suggestions and bug fixes -- this library wouldn't work without you.
-d.