test: add pytest coverage for rs2gp pure helpers (measures, events, timing)

[OmikronApex]

Twenty-seventh repo from the org test-coverage audit. rs2gp.py (the RS-to-GuitarPro-5 converter) imports two dependencies at module top level: guitarpro (PyGuitarPro, a real pip package - pinned in the new requirements.txt) and song.arrangement_string_count (a host-provided lib module this plugin repo does not ship). A conftest stub supplies just that one symbol so the module imports standalone in CI, without touching the GP5 binary-writing path itself.

14 pytest tests:

• _parse_measures: empty input, grouping by measure marker, BPM estimation from beat interval, last-measure end-time extrapolation, single-beat trailing measure reuses the prior measure's duration
• _fallback_measure: default and custom song length
• _note_dict: carries declared fields, defaults missing effect flags to False
• _merge_events: sorts notes+chords by time, skips high_density chords
• _used_string_indices: covers both standalone notes and chord members
• _quantize_sixteenth: snaps event time to the nearest 32nd-note subdivision
• _decompose_sixteenths / _dur_sixteenths: zero-count yields a whole rest, round-trip for common counts (1-33), dotted-duration multiplier

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores

  • Added a required runtime dependency for Guitar Pro file conversion support.
  • Improved test setup so the project can run in standalone CI environments.

• Tests

  • Added coverage for key helper behavior, including measure parsing, event merging, string usage detection, quantization, and duration handling.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 343c71a9-e835-4496-91cf-e45fdae6b21a

📥 Commits

Reviewing files that changed from the base of the PR and between 8eecf04 and 9b44061.

📒 Files selected for processing (3)

• requirements.txt
• tests/conftest.py
• tests/test_rs2gp_helpers.py

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📝 Walkthrough

Walkthrough

This PR adds a PyGuitarPro dependency to requirements.txt, updates tests/conftest.py to configure sys.path and stub a song module, and introduces tests/test_rs2gp_helpers.py containing unit tests for several internal helper functions in rs2gp.py.

Changes

rs2gp Test Enablement

Layer / File(s)	Summary
Dependency and test bootstrap requirements.txt, tests/conftest.py	Adds PyGuitarPro>=0.11 to requirements.txt and configures conftest.py to prepend the repo root to sys.path and stub the song module with arrangement_string_count for standalone imports.
Helper function tests tests/test_rs2gp_helpers.py	New test module validates _parse_measures, _fallback_measure, _note_dict, _merge_events, _used_string_indices, _quantize_sixteenth, _decompose_sixteenths, and _dur_sixteenths behavior with deterministic inputs.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: added pytest coverage for rs2gp helper functions and timing logic.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-basic-tests

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