Detecting a running ToolServer?

I'd like either Test::Harness or Module::Build (not sure which) to try to
figure out if `$^X ...` is going to work on MacPerl so it can warn the user
that 'Build test' isn't going to work rather than simply vomit when it tries
to run the tests.  So is there a way to determine if ToolServer is running?
Or should I just do a `$^X -e 'print "Test"'` probe?


-- 

Michael G. Schwern   <[email protected]>    http://www.pobox.com/~schwern/
Perl Quality Assurance      <[email protected]>         Kwalitee Is Job One
It wasn't false, just differently truthful.
        -- Abhijit Menon-Sen in <[email protected]>