---
phase: 21
slug: chat-foundation
status: draft
nyquist_compliant: false
wave_0_complete: false
created: 2026-04-01
---

# Phase 21 — Validation Strategy

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

---

## Test Infrastructure

| Property | Value |
|----------|-------|
| **Framework** | vitest |
| **Config file** | `ui/vitest.config.ts` (if exists) or created in Wave 0 |
| **Quick run command** | `cd ui && pnpm test --run` |
| **Full suite command** | `cd ui && pnpm test --run --coverage` |
| **Estimated runtime** | ~15 seconds |

---

## Sampling Rate

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

---

## Per-Task Verification Map

| Task ID | Plan | Wave | Requirement | Test Type | Automated Command | File Exists | Status |
|---------|------|------|-------------|-----------|-------------------|-------------|--------|
| 21-01-01 | 01 | 1 | CHAT-02, CHAT-03 | unit | `cd ui && pnpm test --run` | ❌ W0 | ⬜ pending |
| 21-01-02 | 01 | 1 | HIST-01, HIST-02 | unit | `cd ui && pnpm test --run` | ❌ W0 | ⬜ pending |
| 21-02-01 | 02 | 1 | CHAT-04, CHAT-05, CHAT-06 | unit | `cd ui && pnpm test --run` | ❌ W0 | ⬜ pending |
| 21-02-02 | 02 | 1 | INPUT-01, INPUT-07 | unit | `cd ui && pnpm test --run` | ❌ W0 | ⬜ pending |
| 21-03-01 | 03 | 2 | HIST-03, HIST-05, HIST-06 | unit | `cd ui && pnpm test --run` | ❌ W0 | ⬜ pending |
| 21-03-02 | 03 | 2 | THEME-01, THEME-02 | visual | manual | N/A | ⬜ pending |

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

---

## Wave 0 Requirements

- [ ] `ui/src/__tests__/chat/` — test directory structure
- [ ] Vitest config if not present
- [ ] Test utilities for rendering with providers (theme, panel context)

*Test stubs will be created during Wave 0 of execution if needed.*

---

## Manual-Only Verifications

| Behavior | Requirement | Why Manual | Test Instructions |
|----------|-------------|------------|-------------------|
| Theme visual correctness | THEME-01, THEME-02 | Visual appearance cannot be tested with unit tests | Switch between Catppuccin Mocha, Tokyo Night, and Catppuccin Latte; verify code block highlighting matches active theme |
| Markdown rendering fidelity | CHAT-04 | Complex rendering output hard to unit test fully | Send messages with code blocks, tables, lists, headings, links, inline images; verify each renders correctly |

---

## 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