---
phase: 9
slug: frequency-design-and-group-architecture
status: draft
nyquist_compliant: false
wave_0_complete: false
created: 2026-03-27
---

# Phase 9 — Validation Strategy

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

---

## Test Infrastructure

| Property | Value |
|----------|-------|
| **Framework** | go test |
| **Config file** | none — standard Go test runner |
| **Quick run command** | `go test ./synth/... ./config/...` |
| **Full suite command** | `go test ./...` |
| **Estimated runtime** | ~5 seconds |

---

## Sampling Rate

- **After every task commit:** Run `go test ./synth/... ./config/...`
- **After every plan wave:** Run `go test ./...`
- **Before `/gsd:verify-work`:** Full suite must be green
- **Max feedback latency:** 5 seconds

---

## Per-Task Verification Map

| Task ID | Plan | Wave | Requirement | Test Type | Automated Command | File Exists | Status |
|---------|------|------|-------------|-----------|-------------------|-------------|--------|
| 09-01-01 | 01 | 1 | FREQ-01 | unit | `go test ./synth/... -run TestFreqConfig` | ✅ | ⬜ pending |
| 09-01-02 | 01 | 1 | FREQ-02 | unit | `go test ./synth/... -run TestInterval` | ❌ W0 | ⬜ pending |
| 09-01-03 | 01 | 1 | GRP-01 | unit | `go test ./synth/... -run TestGroupField` | ❌ W0 | ⬜ pending |
| 09-01-04 | 01 | 1 | FREQ-03 | unit | `go test ./config/... -run TestAutoAssign` | ✅ | ⬜ pending |
| 09-01-05 | 01 | 1 | FREQ-04 | unit | `go test ./synth/... -run TestFrequencies` | ✅ | ⬜ pending |
| 09-01-06 | 01 | 1 | GRP-04 | unit | `go test ./synth/... -run TestGroupPopulated` | ❌ W0 | ⬜ pending |

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

---

## Wave 0 Requirements

- [ ] `synth/bank_test.go` — TestIntervalConstraint: verify all within-family pairs have ratio >= 1.122
- [ ] `synth/bank_test.go` — TestGroupFieldPopulated: verify all ClassFreqConfigs entries have non-empty Group
- [ ] Update `TestHarmonicsNonEmpty` to accept >= 1 harmonic (for WaveformSine entries)

*Existing infrastructure covers most phase requirements. Wave 0 adds targeted assertions for new constraints.*

---

## Manual-Only Verifications

| Behavior | Requirement | Why Manual | Test Instructions |
|----------|-------------|------------|-------------------|
| Frequency table documented in planning doc | FREQ-01 | Documentation artifact | Inspect 09-RESEARCH.md or code comment for complete Hz/waveform/group table |

---

## 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