---
phase: 4
slug: heatmap-interaction
status: draft
nyquist_compliant: false
wave_0_complete: false
created: 2026-04-08
---

# Phase 4 — Validation Strategy

> Per-phase validation contract for feedback sampling during execution.

---

## Test Infrastructure

| Property | Value |
|----------|-------|
| **Framework** | Vitest 3.x (JS) + PHPUnit (PHP) |
| **Config file** | `vitest.config.ts` / `phpunit.xml.dist` |
| **Quick run command** | `npx vitest run` |
| **Full suite command** | `npx vitest run && php vendor/bin/phpunit` |
| **Estimated runtime** | ~5 seconds |

---

## Sampling Rate

- **After every task commit:** Run `npx vitest run`
- **After every plan wave:** Run `npx vitest run && php vendor/bin/phpunit`
- **Before `/gsd-verify-work`:** Full suite must be green
- **Max feedback latency:** 5 seconds

---

## Per-Task Verification Map

| Task ID | Plan | Wave | Requirement | Threat Ref | Secure Behavior | Test Type | Automated Command | File Exists | Status |
|---------|------|------|-------------|------------|-----------------|-----------|-------------------|-------------|--------|
| 04-01-01 | 01 | 1 | HEAT-07 | — | N/A | unit | `npx vitest run` | ❌ W0 | ⬜ pending |
| 04-01-02 | 01 | 1 | INTR-01 | — | N/A | unit | `npx vitest run` | ❌ W0 | ⬜ pending |
| 04-02-01 | 02 | 2 | TEST-04 | — | N/A | unit | `npx vitest run` | ❌ W0 | ⬜ pending |

*Status: ⬜ pending · ✅ green · ❌ red · ⚠️ flaky*

---

## Wave 0 Requirements

- Existing test infrastructure covers all phase requirements (Vitest + jsdom already configured from Phase 3).

---

## Manual-Only Verifications

| Behavior | Requirement | Why Manual | Test Instructions |
|----------|-------------|------------|-------------------|
| Click navigates to Kimai timesheet | HEAT-07 | window.location.href mock in jsdom | Verify in browser: click cell, check URL |
| Filter dropdown visual placement | INTR-01 | Layout/positioning | Visual inspection in browser |

---

## Validation Sign-Off

- [ ] All tasks have `<automated>` verify or Wave 0 dependencies
- [ ] Sampling continuity: no 3 consecutive tasks without automated verify
- [ ] Wave 0 covers all MISSING references
- [ ] No watch-mode flags
- [ ] Feedback latency < 5s
- [ ] `nyquist_compliant: true` set in frontmatter

**Approval:** pending