Improving unit tests

[Janderson]

 > Someone who's a big unittesting fan should write up a proposal on
 > this.  I think unittests are neat and all -- I probably don't use them
 > as much as I should -- but I don't really know what's so great about
 > named unittests or other things people mention that D's unittests
 > lack.  I suspect Walter may be in the same boat.  You can't address a
 > problem if you don't really understand it.
 > --bb

Its funny, I was just thinking last night of starting a new thread about 
exactly that.  For me I only ever use unit tests in a simple way however 
I'd like to learn about move advanced features that D is missing.

I was originally thinking, maybe unit tests shouldn't be part of D to 
allow for innovation. However then I though, what about if D's unit 
tests where extensible though some language syntax?

Questions:
1) What features are missing from D's unit tests that you miss?

2) Should D decouple unittests from the language or should there be 
language changes to allow for for more extensible unit tests?

3) If you chose "more extensible unit tests" what language features 
would be needed to make this happen.

-Joel