Thanks Bloodnok. That works.
One of the responses in the CB directed me to using  is_deeply but I didn't understand. When I look at the examples for Test::Simple and Test::More it all looks so simple but my searching didn't lead me to an example of testing subroutines. I would have never known to use anonymous arrays. Am I going about testing subroutines wrong? Or maybe I should ask if there's a simpler/newbie way to test subroutines?

UPDATE:
OK I think I understand now. The part I was missing was that I need to run the code in the test file and then compare the results. Like this I believe:

#!/usr/bin/perl 
use strict;
use warnings;
use Mymodule qw( values );
use Test::More qw(no_plan);

BEGIN { use_ok('Mymodule', qw( values )) };

my $pig = 3;
my $cow = 4;

my ($animals1, $animals2) = values($pig, $cow);
is ($animals1,  3, "Checking animals1");
is ($animals2,  4, "Checking animals2");
[download]

Doh!