in reply to how to get a module to work in a specific directory

Can't you just use

use lib '/directory/containing/your/pm';
use testmodule;

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or

BEGIN {
    require 'path/to/testmodule.pm';
    your::package::name->import;
}

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see lib or use for more information

Unless I state otherwise, all my code runs with strict and warnings

In Section Seekers of Perl Wisdom