---
phase: 01.1-hexagonal-architecture
plan: 03
subsystem: process
tags: [vitest, testing, events, process-lifecycle, hexagonal]

# Dependency graph
requires:
  - phase: 01.1-01
    provides: EventBus port interface and domain event types
provides:
  - Comprehensive test coverage for ProcessRegistry and ProcessManager
  - ProcessManager event emission via optional EventBus
  - ProcessSpawned, ProcessStopped, ProcessCrashed events on process lifecycle
affects: [01.1-04, 01.1-05, 01.1-06]

# Tech tracking
tech-stack:
  added: []
  patterns: [optional-dependency-injection, mock-based-testing]

key-files:
  created:
    - src/process/registry.test.ts
    - src/process/manager.test.ts
  modified:
    - src/process/manager.ts

key-decisions:
  - "EventBus is optional parameter for backwards compatibility"
  - "Events emitted inline (synchronous) - no async event handling needed"
  - "Mock execa module in tests to avoid spawning real processes"

patterns-established:
  - "Optional eventBus parameter pattern for event emission"
  - "Exit handler emits appropriate event based on exit code (stopped vs crashed)"

# Metrics
duration: 3min
completed: 2026-01-30
---

# Phase 1.1 Plan 03: Process Module Testing and Events Summary

**Comprehensive test coverage for ProcessRegistry and ProcessManager with domain event emission for process lifecycle coordination**

## Performance

- **Duration:** 3 min
- **Started:** 2026-01-30T13:01:08Z
- **Completed:** 2026-01-30T13:04:00Z
- **Tasks:** 2
- **Files modified:** 3

## Accomplishments

- ProcessRegistry fully tested (15 tests covering register, get, getAll, updateStatus, unregister, getByPid, clear)
- ProcessManager fully tested (20 tests covering spawn, stop, stopAll, restart, isRunning, event emission)
- ProcessManager now accepts optional EventBus for domain event emission
- ProcessSpawned event emitted after successful spawn
- ProcessStopped event emitted on normal exit (code 0)
- ProcessCrashed event emitted on non-zero exit with signal

## Task Commits

Each task was committed atomically:

1. **Task 1: Write unit tests for ProcessRegistry and ProcessManager** - `b556c10` (test)
2. **Task 2: Refactor ProcessManager to emit events via event bus** - `3b24cf2` (feat)

## Files Created/Modified

- `src/process/registry.test.ts` - 15 tests for ProcessRegistry CRUD operations
- `src/process/manager.test.ts` - 20 tests for ProcessManager lifecycle and events
- `src/process/manager.ts` - Added optional eventBus parameter and event emission

## Decisions Made

1. **Optional eventBus parameter** - Backwards compatible; events only emitted if eventBus provided
2. **Synchronous event emission** - Events emitted inline during spawn/exit; no async handling needed for in-process bus
3. **Mock execa in tests** - Avoid spawning real processes; control subprocess behavior via mock

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- Process module fully tested with 35 tests
- Event emission enables coordination between modules
- Ready for 01.1-04: Server Event Integration

---
*Phase: 01.1-hexagonal-architecture*
*Completed: 2026-01-30*
