At the moment Phorge does not have unit tests for calendar imports.

Maybe we can add a system that tries to import .ics files and does some evaluation on expected contents.

So basically we should add coverage on this:

https://we.phorge.it/source/phorge/browse/master/src/applications/calendar/import/PhabricatorCalendarImportEngine.php

So it's more easy for contributors and reviewers to check if something new is breaking some workflows, or not.