It's a nifty little VIM script in that goes in .vimrc file:

"=====[ Run a Perl module's test suite ]=========================

let g:PerlTests_program       = 'perltests'   " ...What to call
let g:PerlTests_search_height = 5             " ...How far up to searc
+h
let g:PerlTests_test_dir      = '/t'          " ...Where to look for t
+ests

augroup Perl_Tests
    autocmd!
    autocmd BufEnter *.p[lm]  nmap <buffer> ;t :call RunPerlTests()<CR
+>
    autocmd BufEnter *.t      nmap <buffer> ;t :call RunPerlTests()<CR
+>
augroup END 

function! RunPerlTests ()
    " Start in the current directory...
    let dir = expand('%:h')

    " Walk up through parent directories, looking for a test directory
+...
    for n in range(g:PerlTests_search_height)
        " When found...
        if isdirectory(dir . g:PerlTests_test_dir)
            " Go there...
            silent exec 'cd ' . dir 

            " Run the tests...
            exec ':!' . g:PerlTests_program

            " Return to the previous directory...
            silent cd -
            return
        endif

        " Otherwise, keep looking up the directory tree...
        let dir = dir . '/..'
    endfor

    " If not found, report the failure...
    echohl WarningMsg
    echomsg "Couldn't find a suitable" g:PerlTests_test_dir '(tried' g
+:PerlTests_search_height 'levels up)'
    echohl None
endfunction
[download]

The VIM script makes use of a perltests script in ~/bin which finds the tests and executes them via TAP::Harness which itself can take a lib argument when creating a new object. So it seems like I should be able to put something in there to make this work. The beauty of it is I can do ;t keystroke and run tests.