buster test case for forms and response transformers

Next try.  I'm much happier with this one.  Please check if you think it's a valid test.  Also, let me know if you want me to remove the whitespace noise (sorry, my editor did that :)

I also pushed my attempt at fixing this in branch tmp-2013-09-09-2008, but it doesn't seem to do what I thought.  Not sure which is broken: the test or my attempt at a fix.

thanks,
matthias