in reply to CPAN test scripts, "run" directory, and test data files

To get the path to the t/ directory, you can also use $FindBin::Bin (in core since 5.4) in your test file. That's what I did in Syntax::Construct.
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord }map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,