The fact that it is in a shared folder is of no consequence. As long as the folder is in @INC, shared or otherwise, Perl will look for the module there. Two convenient ways of modifying @INC is through env var PERL5LIB (see perlrun) and via module lib.

use lib '\\\\server1\\doc';
  or
use lib '//server1/doc';

use test;
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If you're going to use use, make sure test.pm starts with package test;. Also make sure to use the same capitalisation for the name in both the use and package statements.