use_ok and require_ok are not recommended any more. Just use or require the modules as necessary and let perl provide the appropriate failure message if either of those fails.

examples/perl/t/use_ok.t
use strict;
use warnings;

use Test::More tests => 1;

use lib 'lib';
BEGIN { use_ok('MyTools'); }

# the rest of the tests...
1..1
ok 1 - use MyTools;