* Adds Unit Tests for Radio Messages (#77392)
## About The Pull Request
In light of the issues caused by #77350, it would be good to add unit
tests for radio messages so that this doesn't happen again.
I have tested the unit tests, they will pass with the current code but
correctly fail if the aforementioned bug is still present.
## Why It's Good For The Game
Unit tests are good.
## Changelog
No player-facing changes, just unit tests.
* Adds Unit Tests for Radio Messages
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Co-authored-by: GPeckman <21979502+GPeckman@users.noreply.github.com>
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