Did someone find a good solution for unit testing?

Currently, i'm using Jest to unit test the more complex parts of my code.
https://jestjs.io/

But, since i'm not much familiar with NodeJS build pipeline, the best solution i've found is to create a vanilla javascript code and integrate him into the project, kinda like an external tool.
So, I can unit test that code since he don't touch any Tiny related stuff.

I'm very happy to be allowed to test all my complex code without play the game everytime, but would be much nicer if i could test my Tiny code too.