test: add unit tests for visualize_timeline closes #54

[VaishnaviJagtap18]

Summary

Closes #54

What changed

• Added 15 unit tests to 'tests/test_visualize_timeline.py'

Tests Added

• PNG output generated correctly
• Works with 5 and 10 tracks
• Runs without display server (matplotlib Agg backend)
• Unit tests use synthetic TrackSequence data (no Redis needed)
• Zone color coding tested (restricted=red, safe=green, unknown=grey)
• Case insensitive zone color lookup
• Empty events raises ValueError
• Single track rendering
• Nested directory auto-creation
• PNG magic bytes validation
• Events with no action hints

Test Results

16 Passed, 0 Failed in 2.33s

Summary by CodeRabbit

• Tests
  • Expanded timeline visualization test coverage with checks for synthetic event generation, zone-to-color mapping, and multiple rendering edge cases.
  • Added validation for empty input handling, nested output paths, PNG output integrity, single- and multi-track rendering, and cases with no action hint.
  • Included an additional multi-track existence check to improve confidence in timeline output.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: ec30a5cf-8b0c-4802-8d80-6e41c4542574

📥 Commits

Reviewing files that changed from the base of the PR and between 147b2c0 and 41e21df.

📒 Files selected for processing (1)

• tests/test_visualize_timeline.py

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📝 Walkthrough

Walkthrough

The test suite for timeline visualization is expanded with new imports (TrackSequenceEvent, _zone_color, ZONE_COLORS) and additional test cases covering synthetic track sequence generation, zone color mapping logic, and render_timeline edge cases including empty input, single/multiple tracks, nested output directories, PNG validation, and action_hint handling.

Changes

Timeline visualization test suite

Layer / File(s)	Summary
Imports and existing PNG test tests/test_visualize_timeline.py	Imports extended with TrackSequenceEvent, _zone_color, and ZONE_COLORS; original PNG-generation test retained unchanged.
Synthetic track sequence tests tests/test_visualize_timeline.py	New tests validate create_synthetic_track_sequence for correct track counts, track IDs, three events per track, restricted zone values, and valid start/end ordering.
Zone color mapping tests tests/test_visualize_timeline.py	New tests validate _zone_color returns correct colors for restricted/safe, a default for unknown zones, and case-insensitive handling.
render_timeline edge cases and outputs tests/test_visualize_timeline.py	New tests validate ValueError on empty input, single/multiple/ten-track rendering, nested output directory creation, PNG magic-byte validation, and action_hint=None handling.

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

Possibly related PRs

• Devnil434/Eagle#84: Implements scripts/visualize_timeline.py with TrackSequenceEvent, create_synthetic_track_sequence, _zone_color/ZONE_COLORS, and render_timeline, which this test suite directly validates.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The changes add tests for timeline visualization, but #54 requires the actual scripts/visualize_timeline.py feature and rendering behavior.	Implement scripts/visualize_timeline.py with the required matplotlib timeline rendering, Agg support, PNG output, and action-hint markers, then keep the tests.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly states the PR adds unit tests for visualize_timeline and references the related issue.
Out of Scope Changes check	✅ Passed	The changes stay focused on visualize_timeline testing and do not introduce unrelated code.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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