Neither this module nor the base Business::OnlinePayment framework are regularly tested on Windows or non-Unix platforms.
AFAIK, neither myself nor any of the other Business::OnlinePayment contributors are setup to test or develop on Windows at all.
If you're looking to use this module or other Business::OnlinePayment modules on Windows, please join the bop-devel@ mailing list and help us develop and test the modules on this platform. See
http://420.am/business-onlinepayment/
If your concern is purely for CPAN testing, perhaps you would like to contribute a patch to disable tests on the Windows platform? It could print a warning / message about assisting with maintenance on this platform.
Ivan