#!/usr/bin/perl use v5; use strict; use warnings; use Test::More; use IO::Socket::IP; my $server = IO::Socket::IP->new( Listen => 1, LocalHost => "127.0.0.1", LocalPort => 0, ) or die "Cannot listen on PF_INET - $!"; my $client = IO::Socket::IP->new( PeerHost => $server->sockhost, PeerPort => $server->sockport, ) or die "Cannot connect on PF_INET - $!"; my $accepted = $server->accept( 'MySubclass' ) or die "Cannot accept - $!"; isa_ok( $accepted, 'MySubclass' ); done_testing; package MySubclass; use base qw( IO::Socket::IP );