well, and this may a little bit controversial, but...
#!perl
use strict;
use warnings;
use Test::More tests => 1;
my $x = 5;
my $y = 3;
is $x / $y, undef, 'Yes, your integers behave exactly as expected';
=head1 output
1..1
not ok 1 - yes your integers behave as expected
# Failed test 'yes your integers behave as expected'
# at -e line 1.
# got: '1.66666666666667'
# expected: undef
# Looks like you failed 1 test of 1.
=cut
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