Improving unit tests

[Sean Kelly]

Don wrote:
> 
> Couldn't there be some hidden global bool, isInUnitTest, which is set 
> when the unit tests start to run, and which is set back to false when 
> the last one ends. assert() could have different behaviour depending on 
> whether it's in the unit testing phase, or not.

assert currently must throw when using DMD because it doesn't generate a 
fukk stack frame for the call.  For unit tests though, a unit tester 
could override assert only for the duration of unit testing.


Sean