I've been looking at my options for re-enabling my test code to function with msvc 6.0. It looks to me that the minimal test framework would be satisfactory for me. I have a couple of questions though.

You could keep using regular Boost.Test component for now. At least until Boost drops msvc 6.5 from regression tests

a) Does the minimal test framework work with msvc 6.0?

Yes

b) If the answer is yes, can it be expected to continue to function the same in future versions or is it subject to further "enhancement" which might break it for old compilers?

This components never really changed from the inception. And should stay like this in most part. Gennadiy