[chore] Add Unit Tests for `check-modules/index.ts`

[JHWelch]

While looking through scripts/check-modules/index.ts, I noticed that the script has over time covered a good number of different suggestions, and ended up fairly complicated for a script.

There are probably some opportunities to refactor the checks to make it easier to continue to add and fix them, but of course that is easier done with some unit tests.

There are a few other automated checks on this repository, but I don't think I saw a unit test framework installed.

Would it make sense to add Vitest, as that is what the main MagicMirror repository is using?

Getting this set up initially with everything properly mocked/prepared would probably be a bit of an undertaking, but once it is in place it could help more safely make future improvements!

This is something I would be interested in working through, I enjoy backfilling tests, but I did not want to just open a PR without a 👍🏼 on a framework or desire for the tests.

[KristjanESPERANTO]

Thanks for bringing this up! 🙂

Good news: We already have a unit test suite in place! The project uses Node.js' native test runner (node --test) with 12 test files covering key modules:

• scripts/shared/__tests__/ (6 tests) – shared utilities like logger, http-client, rate-limiter, caching
• scripts/check-modules/__tests__/ (4 tests) – rule-registry, config loading, dependency detection, run summaries
• scripts/check-modules/compare/__tests__/ (1 test) – diff logic

You can run them with npm run test:unit.

The gap: You're absolutely right that scripts/check-modules/index.ts itself lacks direct test coverage. It contains ~32 functions including the core analyzeModule() logic that would greatly benefit from tests.

Context on refactoring: I'm currently working on a parallel worker architecture that merges stages 3+4+5. This makes your proposal even more valuable – tests would help ensure the migration doesn't introduce regressions.

Framework choice: I'm happy with Node.js' native test runner so far for this project and I like to test what it's capable of - big plus is that it is build-in in Node.js.

Next steps: Would you be interested in:

1. Adding tests for utility functions in index.ts (e.g., formatRunDirectoryId, extractReadmeSection, getRepositoryHost)?
2. Breaking down analyzeModule() into smaller, testable units?
3. Adding integration tests for the worker logic in pipeline/workers/?
4. Or something else?

Any of these would be valuable contributions! Let me know which area interests you most, and I'm happy to collaborate on the approach.

[JHWelch]

Great! Good to hear there is some in place, I hadn't used Node's test runner before and hadn't thought to look for it! Totally missed the __test__ directory 🤦🏼

I would definitely be interested in starting to build out the suite for the functions in index itself. analyzeModule might be a nice place to start.

If possible I tend to try and get tests backfilled for the whole thing before splitting it up, though obviously might find some limits there depending on what I run into.

Would you prefer pure test PRs, or do you mind some light refactoring as I go?

And in general I would approach this in a series of smaller PRs, instead of trying to get everything filled in at once.

[KristjanESPERANTO]

Would you prefer pure test PRs, or do you mind some light refactoring as I go?

If you make separate commits for tests and refactoring, it should also be okay to put them in one PR.

And in general I would approach this in a series of smaller PRs, instead of trying to get everything filled in at once.

It depends. For example, if you're doing a PR only with new tests, it can be as big as you like. As soon as refactoring or features are included, it's better to have manageable PRs.

For the beginning, definitely start small 🙂

[KristjanESPERANTO]

By the way, I'm glad you're motivated to tackle this! 👍

[JHWelch]

Thanks! Okay, I'll take a stab at this at some point coming up. Glad this would be helpful.

This was originally motivated by thinking about any solutions for #138, because anything more complicated like turning each "issue" into an object or something that has more information would be pretty dangerous without tests.

So whatever we decide over there, if it is more complicated than just adding some emoji or something, I'd probably want to tackle this first anyway.