$ prove -vwb sandbox/used-by.pl
sandbox/used-by.pl ..
Reading '/home/merijn/.cpan/Metadata'
  Database was generated on Mon, 03 Mar 2014 14:17:02 GMT
CPAN: YAML loaded ok (v0.90)
Reading 3 yaml files from /home/merijn/.cpan/build/
..........................DONE
Restored the state of 1 (in 0.0431 secs)
ok 1 - App::tkiv
ok 2 - Geo::KML
ok 3 - Spreadsheet::Read
1..3
ok
All tests successful.
Files=1, Tests=3, 13 wallclock secs ( 0.02 usr  0.00 sys + 10.29 cusr  0.60 csys = 10.91 CPU)
Result: PASS
$