yellowjacket/.planning/phases/04-queue-config-player-tests/04-02-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
04-queue-config-player-tests	02	testing	config theme tracklist favorites library player volume validation table-driven-tests	phase provides 03-test-infrastructure Test infrastructure conventions (t.Parallel, table-driven, stdlib only)	Config roundtrip and validation tests for all sub-configs Player volume conversion characterization tests State mapping coverage for mediacontrols integration	05-database-query-tests 06-sql-consolidation	added patterns Internal package tests (same package) for unexported access Float comparison with math.Abs tolerance for volume tests Characterization roundtrip with ±1 tolerance for int-truncated conversions	created modified backend/config/config_test.go backend/theme/config_test.go backend/tracklist/config_test.go backend/favorites/config_test.go backend/library/config_test.go backend/player/volume_test.go	Roundtrip test uses ±1 tolerance: ToVolume/ToUserVolume uses int truncation not rounding, causing up to 1 unit drift Empty AccentColor not tested as invalid: Validate() calls ApplyDefaults() first, filling in the default value	Config validation tests: table-driven subtests for valid/invalid enum values Volume characterization: boundary values exact, full-range roundtrip within tolerance	TEST-04 TEST-05	4min	2026-03-03

Phase 04 Plan 02: Config & Player Tests Summary

Unit tests for config load/save roundtrip, all sub-config validators (theme/tracklist/favorites/library), and player volume conversion + state mapping — 27 test cases across 6 packages, all passing with -race

Performance

• Duration: 4 min
• Started: 2026-03-03T21:57:19Z
• Completed: 2026-03-03T22:02:12Z
• Tasks: 2
• Files modified: 6

Accomplishments

• Config load/save roundtrip test verifies all fields survive TOML serialization
• All 4 sub-config validators (theme, tracklist, favorites, library) tested for valid values, invalid values, and defaults
• Player volume conversion tested at all boundaries with full 0-100 roundtrip characterization
• stateToMediaControls mapping verified for all states including unknown fallback
• All tests pass with -race flag

Task Commits

Each task was committed atomically:

1. Task 1: Config and sub-config validation tests - f9b2ad9 (test)
2. Task 2: Player volume and state mapping tests - 294b629 (test)

Files Created/Modified

• backend/config/config_test.go - Load/Save roundtrip, missing file, composed errors, nil defaults (227 lines)
• backend/theme/config_test.go - Hex color regex + background shade enum validation (83 lines)
• backend/tracklist/config_test.go - Column ID recognition + duplicate detection (73 lines)
• backend/favorites/config_test.go - Icon style enum validation (49 lines)
• backend/library/config_test.go - Directory existence + scan concurrency mode validation (83 lines)
• backend/player/volume_test.go - Volume conversion, clamp, state mapping (198 lines)

Decisions Made

• Roundtrip tolerance: The ToVolume/ToUserVolume conversion uses int() truncation (not math.Round), so some values lose 1 unit in the roundtrip. The characterization test documents this with a ±1 tolerance, while verifying boundary values (0, 50, 100) are exact.
• Empty AccentColor not invalid: Validate() calls ApplyDefaults() first, which fills empty accent color with #ffd43b, so empty string is handled gracefully rather than being an error case.

Deviations from Plan

Auto-fixed Issues

1. [Rule 1 - Bug] Removed empty-string hex color from invalid test cases

• Found during: Task 1 (theme validation tests)
• Issue: Plan listed empty string as invalid hex color, but Validate() calls ApplyDefaults() first which fills in the default color
• Fix: Removed empty string from invalid test cases — it's valid behavior by design
• Files modified: backend/theme/config_test.go
• Verification: All theme tests pass
• Committed in: f9b2ad9 (Task 1 commit)

2. [Rule 1 - Bug] Changed roundtrip test from exact to ±1 tolerance

• Found during: Task 2 (volume roundtrip test)
• Issue: Plan specified exact roundtrip match for all 0-100 values, but ToUserVolume() uses int() truncation causing up to 1 unit drift
• Fix: Changed to ±1 tolerance with separate exact checks for boundary values (0, 50, 100)
• Files modified: backend/player/volume_test.go
• Verification: All player tests pass with -race
• Committed in: 294b629 (Task 2 commit)

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Total deviations: 2 auto-fixed (2 bugs — plan assumptions didn't match actual code behavior) Impact on plan: Both fixes accurately characterize existing behavior rather than imposing incorrect expectations. No scope creep.

Issues Encountered

None

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Config and player pure logic fully characterized with tests
• Ready for remaining Phase 4 plans (queue tests) or Phase 5 (database query tests)

Self-Check: PASSED

All 6 created files verified on disk. Both commits (f9b2ad9, 294b629) verified in git log.

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Phase: 04-queue-config-player-tests Completed: 2026-03-03