For the following example we've replaced the failing test with one that is successful. This way you can see how does it look like when everything is ok.

examples/perl/tests/t11.pl
use strict;
use warnings;

use FindBin;
use lib "$FindBin::Bin/../lib";
use MyTools;

use Test::Simple tests => 3;

ok( sum(1, 1) == 2 );
ok( sum(2, 2) == 4 );
ok( sum(3, 3) == 6 );

Output:

examples/perl/tests/t11.pl.out
1..3
ok 1
ok 2
ok 3