I was really excited to see a TAP (GSM World) kit for perl until I clicked around in your module a bit. I had to go back to TAP (CPAN) to figure out for certain they're not related — that and that your questions were about testing... Please expand the TAP acronym in your description or synopsis?

Update: In actual fact, there does exist some TAP3::Tap3edit stuff — it seems to use Convert::ASN1 like my hand-rolled version from ages past. Apparently it even comes with the ASN.1 spec files, which is convenient, because the 3gpp site is heinous and evil to try to navigate.