docs(19-02): complete WAV tag writer tests plan

- SUMMARY.md with 7 test results and 2 deviations documented - STATE.md: Phase 19 complete, all WAV requirements verified - ROADMAP.md: Phase 19 marked complete - REQUIREMENTS.md: WAV-06 marked complete
2026-03-19 09:00:29 -04:00
parent f11b523afb
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+---
+phase: 19-wav-tag-writer
+plan: 02
+subsystem: tagwriter
+tags: [wav, riff, id3v2, round-trip-tests, bogem-id3v2]
+
+# Dependency graph
+requires:
+  - phase: 19-wav-tag-writer
+    provides: "writeWavTags function, RIFF parser/writer, FormatWAV pipeline dispatch"
+provides:
+  - "7 WAV round-trip tests covering all WAV requirements (WAV-01 through WAV-06)"
+  - "createTestWAV fixture builder for WAV test files"
+  - "readWavID3Tags read-back helper using bogem/id3v2 ParseReader"
+  - "createTestWAVWithExtraChunks for chunk preservation testing"
+affects: [20-ogg-vorbis-tag-writer]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: ["bogem/id3v2 ParseReader for WAV ID3v2 read-back (dhowden/tag ReadFrom does not support WAV)", "RIFF chunk preservation verification via byte-equal comparison"]
+
+key-files:
+  created:
+    - backend/tagwriter/wav_test.go
+  modified:
+    - backend/tagwriter/wav.go
+
+key-decisions:
+  - "Used bogem/id3v2.ParseReader instead of dhowden/tag.ReadID3v2Tags for test read-back — handles empty tags (cleared cover art) correctly"
+  - "Fixed wsl lint warning in wav.go writeRIFF (cuddled copy expression) from Plan 01"
+
+patterns-established:
+  - "WAV test read-back: extract id3 chunk via parseRIFF, parse with bogem/id3v2.ParseReader, convert to TrackMetadata"
+  - "Chunk preservation testing: compare pre/post byte data for each non-ID3 chunk"
+
+requirements-completed: [WAV-01, WAV-02, WAV-03, WAV-04, WAV-05, WAV-06]
+
+# Metrics
+duration: 9min
+completed: 2026-03-19
+---
+
+# Phase 19 Plan 02: WAV Tag Writer Tests Summary
+
+**7 round-trip tests for WAV ID3v2 tag writing: text fields, cover art, clear art, partial update, chunk preservation, atomic safety, and RF64 rejection**
+
+## Performance
+
+- **Duration:** 9 min
+- **Started:** 2026-03-19T12:48:10Z
+- **Completed:** 2026-03-19T12:58:09Z
+- **Tasks:** 3
+- **Files modified:** 2
+
+## Accomplishments
+- Created test fixture builder (createTestWAV) producing minimal valid WAV files with optional ID3v2 tags
+- Created RIFF-aware read-back helper using bogem/id3v2.ParseReader (dhowden/tag cannot read WAV files)
+- Verified all 9 text fields round-trip correctly (Title, Artist, Album, AlbumArtist, Genre, Year, TrackNumber, DiscNumber, Composer)
+- Verified cover art embed, replace, and clear operations
+- Verified partial updates preserve unchanged fields
+- Verified non-ID3v2 chunks (fmt, data, LIST INFO, bext) are byte-identical after tag write
+- Verified atomic safety: failed write leaves original file untouched
+- Verified RF64 files are rejected with clear error message
+- Fixed all wsl lint warnings in WAV files (zero remaining lint issues in wav.go and wav_test.go)
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Create WAV test fixture builder and read-back helper** - `21fe172` (test)
+2. **Task 2: Write round-trip tests for all WAV requirements** - `1b28882` (test)
+3. **Task 3: Full test suite verification and lint fixes** - `f11b523` (style)
+
+## Files Created/Modified
+- `backend/tagwriter/wav_test.go` - 7 test functions, 3 test helpers (createTestWAV, readWavID3Tags, createTestWAVWithExtraChunks), ~665 lines
+- `backend/tagwriter/wav.go` - Fixed wsl lint warning (cuddled copy expression in writeRIFF)
+
+## Decisions Made
+- Used bogem/id3v2.ParseReader instead of dhowden/tag.ReadID3v2Tags for WAV read-back — dhowden/tag.ReadID3v2Tags fails on empty tags (after clearing all APIC frames), while bogem handles all cases
+- Fixed lint warning in wav.go from Plan 01 (in scope since it's a phase-19 file)
+
+## Deviations from Plan
+
+### Auto-fixed Issues
+
+**1. [Rule 1 - Bug] dhowden/tag ReadID3v2Tags fails on empty ID3v2 tags**
+- **Found during:** Task 2 (TestWriteWavTags_ClearCoverArt)
+- **Issue:** Plan specified using `tag.ReadID3v2Tags()` for read-back, but it fails with EOF when parsing an ID3v2 tag with no frames (after clearing all cover art)
+- **Fix:** Switched readWavID3Tags helper to use `bogem/id3v2.ParseReader()` which handles empty tags correctly, then manually extracts fields from the bogem tag object
+- **Files modified:** backend/tagwriter/wav_test.go
+- **Verification:** TestWriteWavTags_ClearCoverArt passes
+- **Committed in:** 1b28882 (Task 2 commit)
+
+**2. [Rule 3 - Blocking] wsl lint warnings in wav_test.go and wav.go**
+- **Found during:** Task 3 (make lint)
+- **Issue:** Multiple "only cuddled expressions if assigning variable or using from line above" warnings from wsl linter
+- **Fix:** Added blank lines before cuddled expressions in both wav_test.go and wav.go
+- **Files modified:** backend/tagwriter/wav_test.go, backend/tagwriter/wav.go
+- **Verification:** make lint shows zero warnings in WAV files
+- **Committed in:** f11b523 (Task 3 commit)
+
+---
+
+**Total deviations:** 2 auto-fixed (1 bug, 1 blocking)
+**Impact on plan:** ReadID3v2Tags limitation required alternative approach for read-back; lint fixes are mechanical. No scope creep.
+
+## Issues Encountered
+None
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- WAV tag writer is fully implemented and tested (WAV-01 through WAV-06 complete)
+- Phase 19 (WAV Tag Writer) is complete
+- Ready for Phase 20 (OGG Vorbis Tag Writer) or next milestone phase
+
+## Self-Check: PASSED
+
+All created files verified on disk. All commit hashes found in git log. wav_test.go is 664 lines (exceeds 200 min_lines requirement).
+
+---
+*Phase: 19-wav-tag-writer*
+*Completed: 2026-03-19*