Sample TAP-ready file:

#!/bin/env perl

# Test script for RT 75254
# URL: http://rt.perl.org/rt3/Public/Bug/Display.html?id=75254
# URL: http://www.perlmonks.org/?node_id=841116

use strict;
use warnings;
use Time::HiRes qw(time);
use Test::More;

use Scalar::Util qw(weaken);

# The ratio of time with weaken vs without for which we test.  What is
# the performance target?
my @timefactors = reverse ( 1.5, 2, 5, 10, 25, 50, 100 );

plan tests => 5 + scalar(@timefactors);

my @data = (1, 2, 3);

pass("Begin performance test for weaken(): this may take a while.");

# Record the time without using weaken()
my $withouttime;
{
    my $endtime   = &withoutweaken();
    my $stoptime  = time;
    $withouttime  = $stoptime - $endtime;
}
pass(sprintf("Time without weaken(): %.2f", $withouttime));

# Record the time using weaken()
my $withtime;
{
    my $endtime   = &withweaken();
    my $stoptime  = time;
    $withtime     = $stoptime - $endtime;
}
pass(sprintf("Time with weaken(): %.2f", $withtime));

my $timeratio = ($withtime / $withouttime);
pass(sprintf( "Time Ratio: TIME(with) / TIME(without): %.2f", $timerat
+io ));

foreach ( @timefactors ) {
  ok( $timeratio < $_, "Time ratio is < $_" );
}

pass("End performance test for weaken().");

sub withweaken {
    my @h; for (1 .. 200000) {
        my %hash = (data => \@data);
        weaken($hash{data});
        push @h, \%hash;
    }
    return time;
}

sub withoutweaken {
    my @h; for (1 .. 200000) {
        my %hash = (data => \@data);
        push @h, \%hash;
    }
    return time;
}
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