Adding tests

[xyleth]

Any preferences on test layout, fixture style, or dev-dep file naming before I start?

Any edge cases you're already aware of that need attention, or things you specifically want included / excluded/

This is the proposed scope I have:

Proposed scope (one PR):

• New tests/ directory with pytest-based unit + light integration tests
• New requirements-dev.txt containing pytest (Pillow already a runtime dep, used for image fixtures)
• Coverage targets: MetadataWriter.write_metadata argv construction across the backup/append/skip matrix, MetadataWriter.read_existing_metadata JSON parsing, OllamaWorker._build_prompt, the LLM-response parser, and the RAW-vs-Pillow dispatch in _encode_image. Plus 1–2 end-to-end OllamaWorker runs with requests.post mocked.
• No changes to photoscribe.py. All tests work by mocking at the existing seams (subprocess.run, requests.post).
• No Qt UI tests, no CI config — keeping this PR small and pure-add.

One thing worth flagging: the LLM-response parser and the Ollama HTTP call are both inline inside OllamaWorker.run(). Mocking works fine for now, but if you'd be open to it later, extracting them into small helper methods (e.g. _parse_response(text), _call_ollama(payload)) would make the test surface cleaner and let us cover edge cases (multi-fence responses, retries) more directly. Happy to follow up with that as a separate PR if useful — it's not in scope for this one.

That sound good?

[repomonkey]

Hi @xyleth — I owe you an apology. You asked good, specific questions here and then got radio silence from me for far too long. That's on me, not you, and I'm sorry for leaving you hanging after you'd clearly put thought into the scope. Thank you for your patience.

To answer your questions:

• Test layout / fixture style: a tests/ directory with pytest, class-grouped tests, matching the existing test_folder_context.py / test_keywords.py style. For fixtures, Pillow-generated images into pytest's tmp_path work well, and anything touching ExifTool as a light integration test guarded with a skip when it isn't on PATH.
• Dev-dep file naming: requirements-dev.txt is exactly right (I've since added one with pytest).
• Edge cases worth attention: the big one turned out to be numeric keywords — a purely-numeric keyword (e.g. a year like 2025) comes back from ExifTool's -j as a JSON number, which recently caused a real write-time crash ('int' object has no attribute 'lower'). That whole numeric/coercion path, plus the append/skip/replace matrix and IPTC/XMP/EXIF coalescing in read_existing_metadata, are the areas most worth locking down.

One honest heads-up so you're not duplicating effort: in the course of fixing that numeric-keyword bug I went ahead and added a starter suite covering part of what you proposed — _norm_keywords, _clean_keywords, read_existing_metadata parsing (with a regression test for that bug), _build_prompt, and end-to-end ExifTool writes across append/skip/replace for both embedded and sidecar. It's on main now (tests/test_metadata.py).

That said, there's still plenty of headroom in your original scope that I didn't touch — the LLM-response parser, the retry path, and _encode_image's RAW-vs-Pillow dispatch in particular. You also made a good point about the response handling being inline in OllamaWorker.run(): the backend calls have since been pulled out into _call_ollama / _call_openai, but the JSON parsing is still inline, so a small PR extracting a testable _parse_response(text) helper — so those edge cases (multi-fence responses, retries) can be covered directly — would be genuinely welcome if you're still up for it.

Again, sorry for the delay — and thanks for offering to help make this more robust.