Nrt_Event needs unit tests to ensure functionality

[capnkenny]

Describe the issue:

With that said, we'll need unit tests added to ensure that Nrt_Event_* and friends work properly as our original concern was that since it could be of type T, C obviously does not have a very good way of handling this (although your solution looks to do just that).

Originally posted by @capnkenny in https://github.com/novelrt/NovelRT/pull/486#discussion_r942592840

Please provide the steps to reproduce if possible: N/A

Expected behaviour: Unit tests should exist for the Nrt_Event_* functions.

Please tell us about your environment: N/A

Additional context: N/A