Is anyone capable and willing to help with new UNIT-tests?

Hey there,
I have a PR that is “stuck”, because it apprently requires (a couple / or many ??) new unit-tests in order to pass the checks …
I even fear, that the existing unit-tests involved will also require some rewriting, but I am not sure, because unit-test are currently not a part of my skill-set :neutral_face:

Is anyone capable and willing to contribute here?
If so feel free to make a PR to my forked branch here …

Otherwise I will have to consider making it available as a plugin, because I can currently not invest time into learning something completely new.

Any help is highly appreciated :sunglasses:
Thank you,