---
phase: 05-deploy
plan: "07"
subsystem: server-tests
tags: [health, draining-state, fly-check, vitest, unit-tests, dep-05]
dependency_graph:
  requires: [apps/server/src/health.ts]
  provides: [apps/server/test/health.test.ts]
  affects: [DEP-05 unit stage]
tech_stack:
  added: []
  patterns: [inline-fake-response, vitest-describe-it-expect]
key_files:
  created:
    - apps/server/test/health.test.ts
  modified: []
decisions:
  - "Used inline fakeRes() fake-object pattern (no mock framework) matching log.test.ts/room-key.test.ts project style"
  - "Tests import makeHealthHandler directly from health.ts — no Express process startup needed"
metrics:
  duration: "~5 min"
  completed: "2026-05-08"
  tasks_completed: 1
  tasks_total: 1
---

# Phase 05 Plan 07: Health Handler Unit Tests Summary

Three-state unit coverage for makeHealthHandler() — ok (200), starting (503), draining (503) — plus no-memoization invariant test; closes DEP-05 [unit] stage for trace:check.

## What Was Built

Added `apps/server/test/health.test.ts` with four tests exercising all documented states of `makeHealthHandler()`:

1. `status: 'ok'` → HTTP 200 with exact HealthStatus body shape
2. `status: 'starting'` → HTTP 503 with exact HealthStatus body shape
3. `status: 'draining'` → HTTP 503 with exact HealthStatus body shape (Phase 4 sigterm.ts setDraining path)
4. No-memoization invariant: get() callback is invoked on every request — verified by mutating state between calls and observing different responses

All four tests pass. `pnpm --filter @rebno/server test -- health.test.ts --run` exits 0.

## Requirement Traceability

- `[unit->REQ-DEP-05]` tag present on line 1 of health.test.ts
- DEP-05 [unit] stage now closed; DEP-05 [doc] closed by Plan 02 (fly.{staging,prod}.toml http_check), DEP-05 [impl] closed by Phase 4 health.ts

## Deviations from Plan

None — plan executed exactly as written. Test file content matches the `<action>` block specification verbatim.

## Notes

- No mock framework added — inline fakeRes() object matches project style (log.test.ts / room-key.test.ts)
- Phase 4 health.ts carries only `[impl->REQ-SRV-03]` tag, not `[impl->REQ-DEP-05]` — this is expected since DEP-05 was created in Phase 5 to track the Fly health check requirement specifically; the health handler itself satisfies both SRV-03 (server health endpoint) and DEP-05 (Fly check probe contract)
- Fly Volume mount + auto_stop verification lives in Plan 11 soak (live `curl https://rebno-staging.fly.dev/health`) and Plan 13 RESTORE.md drill — out of scope for this plan

## Self-Check: PASSED

- `apps/server/test/health.test.ts` exists: FOUND
- `.planning/phases/05-deploy/05-07-SUMMARY.md` exists: FOUND
- Commit `db5b7a2` exists: FOUND