Maybe this minimal demo gets you started?

It's implementing a basic test function "rank" which tests eq and does a linear quality ranking from 1 to 0 against the provided list.

The output includes a field "quality:"

You are free to extend this in multiple ways, like

• providing the internal test function, e.g rank( 'is', ,...)
• adjusting the ranking curve
• checking if $TODO is set
• taking advantage of the todo_output handle to collect metrics separately

As already said I'd use TAP::Parser to find the quality fields.

use strict;
use warnings;
use Test::More;

TODO: {
    local $TODO = "STRINGIFICATION";

    rank( 'a-b'  => ['a+(-b)', 'a+-b', 'a-b'], "to pass" );
    rank( 'a--b' => ['a+(-b)', 'a+-b', 'a-b'], "to fail" );
}



sub rank {
    my ($got, $a_exps, $name) = @_;

    local $Test::Builder::Level = $Test::Builder::Level + 1;

    my @exps = @$a_exps;
    my $pos  = 0;
    my %rank = map { $_ => 1- ($pos++ / @exps) } @exps;

    my $quality = $rank{$got};
    if($quality){
        pass($name);
        diag( sprintf "%12s: %.2f", "quality", $quality );
    } else {
        fail($name);
        diag( sprintf "%12s: %s", "got","'$got'" );
        diag( sprintf "%12s: %s", "expected", join ", ", map {"'$_'"} 
+@exps );
        diag( sprintf "%12s: %.2f", "quality", 0 );
    }

}
done_testing;
exit;
__END__
[download]

ok 1 - to pass # TODO STRINGIFICATION
#      quality: 0.33
not ok 2 - to fail # TODO STRINGIFICATION
#   Failed (TODO) test 'to fail'
#   at /home/lanx/perl/pm/test_rank.pl line 10.
#          got: 'a--b'
#     expected: 'a+(-b)', 'a+-b', 'a-b'
#      quality: 0.00
1..2
[download]

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