#file UTest.pm
package UTest;

use warnings;
use strict;

sub new {
  my $class = shift;
  my $self = {
    'name'      => '',
    'condition' => '',
    'args'    	=> [],
  };
  return bless $self, $class;
}
# other sub ...
1;

##</code><code>##

#file Service.pm
package Service;
use UTest;
our @ISA = qw(UTest);

sub new {
  my ($class)  = shift;
  my $self = UTest->new();
  $self->{'captures'} = {};
  bless $self, $class;
  return $self;
}
#others sub...
1;

##</code><code>##

#file test.pl
use Lib::Service;

my $service = Service->new;
#... other codes

##</code><code>##

Can't locate UTest.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.14.2 /usr/local/share/perl/5.14.2 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.14 /usr/share/perl/5.14 /usr/local/lib/site_perl .) at Lib/Service.pm line 2.
BEGIN failed--compilation aborted at Lib/Service.pm line 2.
Compilation failed in require at ./mytest.pl line 2.
BEGIN failed--compilation aborted at ./mytest.pl line 2.