#!perl
use 5.020;
use Test2::V0 '-no_srand' => 1;

my @cases = (
    # case, expected result, todo text
    ['13s4', '3s4' ],
    ['3s44', '3s4' ],
    ['0a1', '0a1' ],
    ['0a2', undef ],
);

for my $case (@cases) {
    my( $line, $expected, $todo ) = @$case;
    my ($result) = $line =~ /
    (
      (\d).(\d)   # Capture the stuff
      (?(?{ $2+1 != $3 })(*FAIL)) # decide if things match our extended criteria
    )/x;

    my $t; if ($todo){ $t = todo( $todo ) };
    is( $result, $expected, $line );
}

done_testing;