Need help in writing test code to test perl script.

I have code as below which sends command through the serial port and gets the reply. Now I want to write a test script which will test PortTry.pl script. Anyone how to achive above. Thanks

use strict;
use Win32::SerialPort;

my $ob = Win32::SerialPort->new ('COM7') || die;

$ob->user_msg(1);     # misc. warnings
$ob->error_msg(1);     # hardware and data errors

$ob->baudrate(38400);
$ob->parity("none");
$ob->parity_enable(1);     # for any parity except "none"
$ob->databits(8);
$ob->stopbits(1);
$ob->handshake('rts');

$ob->write_settings;
#$ob->save("tpj4.cfg");

print "wrote configuration file tpj4.cfg\n";

#$ob->write("ATE0X4\r");
#sleep 1;
#my $result = $ob->input; 
#print "result = $result\n";

$ob->write("AT&V\r");
sleep 2;
my $result = $ob->input;
print "result = $result\n";

$ob->write("AT+CGDCONT?");
sleep 2;
my $result = $ob->input;
print "result = $result\n";


undef $ob;
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