Compiling Devel::Cover stats across scripts

[David Golden]

Before I flounder around to figure this out, I hope that a quick message to 
the list can offer some guidance.

I've got a bunch of test files for a distribution that run a script that 
comes with the distribution.  I'd like to test my coverage against that 
script.  I figure that I can just pass "-MDevel::Cover" to the execution of 
the script if that's also in the HARNESS_PERL_SWITCHES.

If my test file calls the script 20 times testing 20 different execution 
paths, do all the runs get aggregated into cover_db?  Or do I need to create 
separate cover_db_$$ dirs for each of the 20 runs, then use cover at the end 
to merge them together?

Thanks,
David