Thanks to mocking up getCreationDate it is possible to check exact scenarios.

Mixing is not a test itself, it is just code-holder.

This portal type is not used anymore.

Everything *before* the accounting_day day of the month will be delivered.

Allow to pass accounting_date in params in order to easy testing (otherwise
DateTime object would have to be mocked up).

The script disallows to choose day bigger then 28.

internal_packing_list_module and purchase_packing_list_module are available on
site.

This portal type is not used anymore.

This portal type is not used anymore.

The SlapOS code gained full accounting functionality.

Yep, Luke is nice again for live test system.

Also provide test skeleton.