---
phase: 09-scan-cancellation-keyboard-shortcuts
plan: 05
subsystem: integration
tags: [integration-testing, verification, scan-control, keyboard-shortcuts, volume-fix]

# Dependency graph
requires:
  - phase: 09-scan-cancellation-keyboard-shortcuts
    provides: All Phase 9 features — scan control backend (09-01), keyboard shortcuts service (09-02), scan control UI (09-03), shortcuts settings UI (09-04)
provides:
  - End-to-end verified scan cancellation with pause/resume
  - End-to-end verified keyboard shortcuts with rebinding and persistence
  - Volume data flow fix (ChangeVolume/MuteToggle emit events and persist state)
affects: []

# Tech tracking
tech-stack:
  added: []
  patterns: []

key-files:
  created: []
  modified:
    - backend/player/player.go

key-decisions:
  - "ChangeVolume and MuteToggle must emit VolumeChanged event and call saveState for UI sync"

patterns-established: []

requirements-completed: [SCAN-01, SCAN-02, SCAN-03, KEY-01, KEY-02, KEY-03, KEY-04, KEY-05]

# Metrics
duration: 3min
completed: 2026-03-07
---

# Phase 9 Plan 05: Integration Testing & Verification Summary

**End-to-end verification of scan control and keyboard shortcuts with volume data flow bug fix found and resolved during human testing**

## Performance

- **Duration:** ~3 min (continuation — tasks 1-2 completed across checkpoint)
- **Started:** 2026-03-07T02:58:00Z
- **Completed:** 2026-03-07T15:06:00Z
- **Tasks:** 2
- **Files modified:** 1 (bug fix during verification)

## Accomplishments
- Full build verification passed: `go build`, `npx tsc --noEmit`, `go vet`, `go test` all clean
- Event codegen sync verified (frontend/src/events.ts matches backend)
- All 5 scan control methods confirmed Wails-bindable (exported on Library struct)
- All 4 shortcuts config methods confirmed Wails-bindable (exported on Config struct)
- Human verification of all 23 test scenarios approved
- Found and fixed volume data flow bug: ChangeVolume/MuteToggle were missing emitVolumeChanged and saveState calls

## Task Commits

Each task was committed atomically:

1. **Task 1: Build verification and automated checks** - No commit (verification only, no code changes)
2. **Task 2: Human verification of all Phase 9 features** - Approved after bug fix

**Bug fix during verification:** `bb3fd20` (fix: emit VolumeChanged event and persist state in ChangeVolume and MuteToggle)

## Files Created/Modified
- `backend/player/player.go` - Added emitVolumeChanged() and saveState() calls to ChangeVolume() and MuteToggle() methods

## Decisions Made
- ChangeVolume and MuteToggle must emit VolumeChanged event and call saveState — without this, the frontend volume slider and mute icon don't update when keyboard shortcuts change volume

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 1 - Bug] ChangeVolume and MuteToggle missing event emission and state persistence**
- **Found during:** Task 2 (human verification — volume shortcuts didn't update UI)
- **Issue:** `ChangeVolume()` and `MuteToggle()` in `backend/player/player.go` modified volume/mute state but didn't call `emitVolumeChanged()` or `saveState()`, so the frontend volume slider and mute icon never reflected keyboard-shortcut-driven changes
- **Fix:** Added `p.emitVolumeChanged()` and `p.saveState()` calls to both methods, matching the pattern used by `SetVolume()` and `SetMuted()`
- **Files modified:** backend/player/player.go
- **Verification:** Volume up/down shortcuts now update the slider; mute toggle shortcut now updates the mute icon
- **Committed in:** bb3fd20

---

**Total deviations:** 1 auto-fixed (1 bug)
**Impact on plan:** Essential fix for keyboard shortcut → volume UI feedback loop. Without this, volume shortcuts worked but the UI didn't reflect changes.

## Issues Encountered
None beyond the volume data flow bug documented above.

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- Phase 9 complete — all 8 requirements verified (SCAN-01/02/03, KEY-01/02/03/04/05)
- Ready for Phase 10 (Tag Editing) or other v1.1 phases
- Scan control and keyboard shortcuts patterns established for reuse

## Self-Check: PASSED

- [x] backend/player/player.go exists (modified file)
- [x] Commit bb3fd20 exists (bug fix)
- [x] All 4 prior plan summaries exist (09-01 through 09-04)

---
*Phase: 09-scan-cancellation-keyboard-shortcuts*
*Completed: 2026-03-07*