Added TestSoundService

[Intybyte]

Description

Unit tests for new sound system

Proposed changes

Adding unitest

Related Issues (if applicable)

Resolves #3881, #2844, #3880

Checklist

• I have fully tested the proposed changes and promise that they will not break everything into chaos.
• I have also tested the proposed changes in combination with various popular addons and can confirm my changes do not break them.
• I have made sure that the proposed changes do not break compatibility across the supported Minecraft versions (1.16.* - 1.20.*).
• I followed the existing code standards and didn't mess up the formatting.
• I did my best to add documentation to any public classes or methods I added.
• I have added Nonnull and Nullable annotations to my methods to indicate their behaviour for null values
• I added sufficient Unit Tests to cover my code.

[github-actions]

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[J3fftw1]

Thanks for your first PR thank you for reviewing it.

[J3fftw1]

Does this cover all of the soundservice?

[github-actions]

Slimefun preview build

A Slimefun preview build is available for testing!
Commit: 03aa31c

https://preview-builds.walshy.dev/download/Slimefun/4180/03aa31c8

Note: This is not a supported build and is only here for the purposes of testing.
Do not run this on a live server and do not report bugs anywhere but this PR!

[Intybyte]

Does this cover all of the soundservice?

It should, I get all the element in the SoundEffect enum and check if it has a configuration using the SoundService, as it might be null even if it should not.

In fact the SoundEffect enum has a method that gets the SoundService instance in order to check it, which before returning the value checks if it is null, and prints a warning (the comment itself says that this should not happen in the first place), so by adding this test you are checking all of the elements of SoundEffect ahead in the testing.

It is complete unless the reload method requires some testing too.