In cpanel you have an error log, use it. you can also run your script from the command line. SSH into your server and cd to where the sript is. "perl myscript.cgi" will return output. Use a trap sub routine as you move along your script to check outputs.
use -w scitch(perl -w myscript.cgi from the command line) this will help catch typos which can drive you nutz in perl.
oh yea, dont name a script "test"
$thistoo = blah,blah;
$whatisthis = blah,blah;
&trap_errors($whatisthis, error is:$!, $thistoo);
sub trap_errors()
{
local($status,$error,$message)=@_;
print "Content-type: text/html" , "\n\n";
print "<html><body>";
print "Status<p>";
print "$error<br>";
print "$message";
print "</body></html>";
}