If you re-write your code like this:

# Dyn.pm
package Dyn;
use strict;
use warnings;

sub _max { 10 }
sub _rand { rand(shift) }
sub _range {
  my $max = _max();
  my $rand_max = _rand($max);
  return (0..int($rand_max));
}

sub get_list {
  my @arr = ();
  push @arr, $_ for _range();
  return @arr;
}

1;

__END__
[download]

Then you can test get_list() without a random number of tests, like this:

#!/usr/bin/perl
use Test::More tests => 10;
use Dyn;

use Test::Resub qw(resub);

# _max
{
  is( Dyn::_max, 10, 'Got expected max' );
}

# _rand
{
  my $max = 1045;

  srand($$);
  my $dyn_rand = Dyn::_rand($max);

  srand($$);
  my $core_rand = CORE::rand($max);
  is( $dyn_rand, $core_rand, 'We wrap CORE::rand' );
}

# _range runs from 0.._max, returning only integers
{
  my $max = 0;
  my $rs_max = resub 'Dyn::_max', sub { $max };
  my $rs_rand = resub 'Dyn::_rand', sub { return shift }, capture => 1
+;

  is_deeply( [Dyn::_range], [0] );
  is_deeply( $rs_rand->args, [[$max]] );

  $max = 1.2;
  $rs_rand->reset;
  is_deeply( [Dyn::_range], [0, 1] );
  is_deeply( $rs_rand->args, [[$max]] );

  $max = 7.4;
  $rs_rand->reset;
  is_deeply( [Dyn::_range], [0..7] );
  is_deeply( $rs_rand->args, [[$max]] );
}

# get_list is our interface to _range
{
  my @range;
  my $rs_range = resub 'Dyn::_range', sub { @range };
  is_deeply( [Dyn::get_list], [] );

  @range = ('a'..'f');
  is_deeply( [Dyn::get_list], [qw(a b c d e f)] );
}

__END__
[download]

--Belden

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