%!PS

% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/test.start {
    print (:) print
    /test.pass 0 def
    /test.count 0 def
} bind def

/test {
    /test.count test.count 1 add def
    {
        /test.pass test.pass 1 add def
    } {
        ( ) print
        test.count (....) cvs print
        (-fail) print
    } ifelse
} bind def

/test.end {
    ( ) print
    test.count 0 gt {
        (Passed ) print
        test.pass (...) cvs print
        (/) print
        test.count (...) cvs print
        ( \() print
        test.pass 100 mul test.count idiv (...) cvs print
        (%\)) print
        (\r\n) print
    } if
} bind def


% end included library code

/incrementdecrement {
    0 exch
    {
        1 get 43 eq {
            1 add
        } {
            1 sub
        } ifelse
    } forall
} bind def

(incrementdecrement) test.start
[(--x) (x++) (x++)] incrementdecrement 1 eq test
[(x++) (++x) (x++)] incrementdecrement 3 eq test
[(x++) (++x) (--x) (x--)] incrementdecrement 0 eq test
test.end