---
phase: 07-mock-agent-test-harness
plan: 02
subsystem: testing
tags: [vitest, test-harness, fixtures, e2e]

# Dependency graph
requires:
  - phase: 07-01
    provides: MockAgentManager adapter
provides:
  - Test harness with full system wiring
  - Database fixture helpers for seeding hierarchies
  - MockWorktreeManager for git isolation
  - CapturingEventBus for event verification
affects: [08-e2e-scenario-tests, 09-extended-scenarios]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - Fixture-based test seeding with dependency resolution
    - Event capturing wrapper for verification

key-files:
  created:
    - src/test/fixtures.ts
    - src/test/harness.ts
    - src/test/harness.test.ts
    - src/test/index.ts
  modified: []

key-decisions:
  - "DispatchManager requires pre-seeded idle agent before spawning new ones"
  - "Fixtures use name-to-ID mapping for dependency resolution"
  - "MockWorktreeManager allows custom merge results for conflict testing"

patterns-established:
  - "TestHarness wires real managers with mock dependencies"
  - "CapturingEventBus extends EventEmitterBus with event array capture"

# Metrics
duration: 4 min
completed: 2026-01-31
---

# Phase 7 Plan 02: Test Harness with Database Fixtures Summary

**Test harness wiring real DispatchManager and CoordinationManager with MockAgentManager and MockWorktreeManager, plus fixture helpers for seeding complete task hierarchies (initiative -> phase -> plan -> task with dependencies)**

## Performance

- **Duration:** 4 min
- **Started:** 2026-01-31T07:45:28Z
- **Completed:** 2026-01-31T07:49:43Z
- **Tasks:** 3
- **Files modified:** 4

## Accomplishments

- Fixture helpers for seeding complete task hierarchies with dependency resolution
- TestHarness interface providing full system access and helper methods
- createTestHarness() factory wiring real managers with mock dependencies
- MockWorktreeManager with customizable merge results for conflict testing
- CapturingEventBus for event verification in E2E tests
- 19 comprehensive tests proving harness enables E2E scenarios

## Task Commits

Each task was committed atomically:

1. **Task 1: Create fixture helpers for database seeding** - `ba1f7cc` (feat)
2. **Task 2: Create test harness with full system wiring** - `4424a46` (feat)
3. **Task 3: Write tests proving harness works** - `6cc9e7f` (test)

## Files Created/Modified

- `src/test/fixtures.ts` - Fixture interfaces and seedFixture() with SIMPLE/PARALLEL/COMPLEX convenience fixtures
- `src/test/harness.ts` - TestHarness interface, createTestHarness(), MockWorktreeManager, CapturingEventBus
- `src/test/harness.test.ts` - 19 tests covering fixture seeding, dispatch flow, event capture, E2E flows
- `src/test/index.ts` - Public exports for test module

## Decisions Made

- **DispatchManager requires pre-seeded idle agent:** The existing DispatchManager checks for idle agents before spawning new ones. Tests must pre-seed an idle agent for dispatch to succeed.
- **Fixtures use name-to-ID mapping:** Task dependencies are specified by name in fixtures, resolved to actual IDs after creation via SeededFixture maps.
- **MockWorktreeManager allows custom merge results:** setMergeResult() enables testing conflict scenarios without real git operations.

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- Test harness ready for use in E2E scenario tests
- Fixtures enable quick creation of complex task hierarchies
- MockWorktreeManager supports both success and conflict scenarios
- Full dispatch -> complete -> event verification flow proven working

---
*Phase: 07-mock-agent-test-harness*
*Completed: 2026-01-31*
