Over the years I have been slowly writing a node module to help me

write SIP functional/integration tests:

  https://github.com/MayamaTakeshi/sip-lab

I have been adding new features as I needed for new kinds of test but didn't have time to document it.

But now I need to mentor some newcomers to the company I work for 

and had to do it. 

I asked gemini to do it for me and got:

  https://github.com/MayamaTakeshi/sip-lab/blob/master/DOC.md

It might be of help for other people so I am sharing it.