---
phase: 34
slug: i18n-foundation
status: draft
nyquist_compliant: false
wave_0_complete: false
created: 2026-04-13
---

# Phase 34 — Validation Strategy

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

---

## Test Infrastructure

| Property | Value |
|----------|-------|
| **Framework** | Bun test runner + Playwright |
| **Config file** | `bunfig.toml` / `playwright.config.ts` |
| **Quick run command** | `bun test` |
| **Full suite command** | `bun test && bun run test:e2e` |
| **Estimated runtime** | ~15 seconds (unit) + ~60 seconds (e2e) |

---

## Sampling Rate

- **After every task commit:** Run `bun test`
- **After every plan wave:** Run `bun test && bun run build`
- **Before `/gsd-verify-work`:** Full suite must be green
- **Max feedback latency:** 15 seconds

---

## Per-Task Verification Map

| Task ID | Plan | Wave | Requirement | Threat Ref | Secure Behavior | Test Type | Automated Command | File Exists | Status |
|---------|------|------|-------------|------------|-----------------|-----------|-------------------|-------------|--------|
| 34-01-01 | 01 | 1 | D-05 | — | N/A | unit | `bun test tests/i18n/init.test.ts` | ❌ W0 | ⬜ pending |
| 34-01-02 | 01 | 1 | D-06 | — | N/A | unit | `bun test tests/i18n/locales.test.ts` | ❌ W0 | ⬜ pending |
| 34-02-01 | 02 | 1 | D-01 | — | N/A | unit | `bun test` | ✅ | ⬜ pending |
| 34-03-01 | 03 | 2 | D-04 | — | N/A | unit | `bun test tests/i18n/formatters.test.ts` | ❌ W0 | ⬜ pending |
| 34-04-01 | 04 | 2 | D-09, D-10, D-11 | — | N/A | unit | `bun test tests/i18n/language-hook.test.ts` | ❌ W0 | ⬜ pending |
| 34-05-01 | 05 | 3 | D-13, D-14 | — | N/A | manual | Visual check: German UI text | N/A | ⬜ pending |

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

---

## Wave 0 Requirements

- [ ] `tests/i18n/init.test.ts` — i18n initialization loads both locales
- [ ] `tests/i18n/locales.test.ts` — all en keys have corresponding de keys
- [ ] `tests/i18n/formatters.test.ts` — locale-aware formatting produces correct output
- [ ] `tests/i18n/language-hook.test.ts` — language hook returns correct value from settings

---

## Manual-Only Verifications

| Behavior | Requirement | Why Manual | Test Instructions |
|----------|-------------|------------|-------------------|
| German UI text renders correctly | D-13 | Visual quality of AI-generated translations | Switch to German in settings, navigate all pages, verify text is natural German |
| Language picker pill-toggle UX | D-11 | Visual layout consistency with weight/currency toggles | Open settings, verify language picker matches existing toggle patterns |

---

## 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 < 15s
- [ ] `nyquist_compliant: true` set in frontmatter

**Approval:** pending