%!PS

% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/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

/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


% end included library code

/mindiff {
    0 dict begin
    /a exch def
    /md 0 def
    /n false def
    0 1 a length 2 sub {
        /i exch def
        i 1 add 1 a length 1 sub {
            /j exch def
            /diff a i get a j get sub abs def
            n not diff md lt or {
                /md diff def
                /n true def
            } if
        } for
    } for
    md
    end
} bind def

(mindiff) test.start
[1 5 8 9] mindiff 1 eq test
[9 4 1 7] mindiff 2 eq test
test.end