Add server tests

[rubb3rDucc]

Describe your changes

• add unit tests to the server with bun test
• add code coverage tool
• update the docs to explain how to test

added tests for

• spatial audio
• websocket
• audio routing

Issue ticket number and link

ew

Checklist before requesting a review

• I have performed a self-review of my code
• --If it is a core feature--, I have added thorough tests.
• Do we need to implement analytics?
• Will this be part of a product update? If yes, please write one phrase about this update.

[vercel]

@rubb3rDucc is attempting to deploy a commit to the freemanjiang's projects Team on Vercel.

A member of the Team first needs to authorize it.