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Test::Sims is a Perl module to support the Sims testing technique to generate
large, complex, interesting, semi-random yet valid data for testing purposes.
Here's the slides outlining the technique:
Install as any normal Module::Build Perl module.
perl Build.PL
./Build test
sudo ./Build install
Or for your own personal use:
perl Build.PL --install_base ~
./Build test
./Build install
Here's an example of making a simple package to generate random dates.
package Sim::Date;
use strict;
use warnings;
use DateTime;
use Test::Sims;
# Create rand_year(), rand_month(), etc...
# All exportable on demand or with the :rand tag
make_rand year => [1800..2100];
make_rand month => [1..12];
make_rand day => [1..31];
make_rand hour => [0..23];
make_rand minute=> [0..59];
make_rand second=> [0..59];
sub sim_datetime {
my %defaults = (
year => rand_year(),
month => rand_month(),
day => rand_day(),
hour => rand_hour(),
minute => rand_minute(),
second => rand_second(),
return DateTime->new(
%defaults, @_
# Export sim_datetime()
And then using it.
use Sim::Date;
# Random date.
my $date = sim_datetime;
# Random date in the year 2009
my $date = sim_datetime(
year => 2009