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Ismo Vuorinen a5222ec8fe feat: add pytest unit tests and CI workflow (#38 )

* feat: add pytest unit tests and CI workflow

Add 67 tests covering both create_listing.py and dedup.py with shared
Pillow-based image fixtures. Add GitHub Actions workflow to run tests
on Python file changes.

* fix: address PR review feedback

- Use monkeypatch.chdir(tmp_path) so tests write to temp dirs instead
  of polluting the repo's README.md and index.html
- Strengthen unicode filename test to assert URL-encoded form (%C3%A9)
- Move hashlib import to module level in test_dedup.py
- Remove unused _zero_hash helper and Path import
- Prefix unused tuple unpacking variables with underscore

* fix: add docstrings and strengthen degenerate hash test

- Add docstrings to all test classes, methods, and helper functions
  to achieve 100% docstring coverage
- Strengthen test_skips_degenerate_hashes to assert groups == []
  instead of only checking for no-crash

* fix: use hardcoded MD5 digests and add fixture validation

- Replace hashlib.md5() calls with known digest constants to remove
  hashlib import from test module
- Add input validation to _make_gif fixture for clear error messages
  on empty colors or mismatched durations length

2026-03-02 01:03:35 +02:00