command! -nargs=0 GnoFileTest call GnoFileTest()

" place yourself in a xxxxx_filetest.gno
" type `:GnoFileTest`.
" It will
" - get rid of the previous lines following 'Error: ',
" - run `gno test .` for you
" - refresh the filetest automatically 
"   (so you see the errors, or absence of it
"    without opening a terminal).
"
function! GnoFileTest()
    if !expand('%:t') =~ '_filetest.gno$'
        echo "Error: File does not end with _filetest.gno"
    else
        call cursor(1, 1)
        let lnum = search('Error:', 'ne', line('$'))
        if lnum == 0
            echo "Not found in the file: 'Error: '."
        else
            setlocal autoread
            silent execute lnum+1 . ',$delete'
            write
            silent !gno test .
            redraw!
        endif
    endif
endfunction