KeiSeiKit-1.0/skills/test-matrix/phase-2-matrix.md

Phase 2 — Select the test-type × language matrix

Goal: turn CRITICAL + LANGS into the minimum set of (test-type, language) cells to scaffold. Fewer cells, done well, beats many cells half-wired.

2a — Preview auto-recommendation

Apply these rules and emit a preview table in chat (markdown):

Critical path	Recommended test types
Auth / crypto	fuzz + property
Payment	property + e2e + mutation
Data integrity	property + e2e
Performance SLO	load
Untrusted parsing	fuzz + property
User-facing UI	e2e

Cross-product with LANGS → tentative MATRIX_RECO. Example output in chat:

Recommended cells (from CRITICAL × LANGS):
  [1] fuzz × Rust       — rationale: untrusted-parsing + Rust → cargo-fuzz
  [2] property × Rust   — rationale: data-integrity + Rust → proptest
  [3] e2e × TS          — rationale: user-facing UI → Playwright
  [4] load × Rust       — rationale: <100ms SLO → oha + k6
  [5] mutation × Rust   — rationale: payment → cargo-mutants for suite quality

Number each cell for the multi-select.

2b — Confirm / edit matrix (AskUserQuestion multi-select)

{
  "questions": [
    {
      "question": "Which cells to scaffold this session?",
      "header": "Matrix",
      "multiSelect": true,
      "options": [
        {"label": "[1] fuzz × <lang>",      "description": "Generate fuzz target + seed corpus + CI nightly job"},
        {"label": "[2] property × <lang>",  "description": "Add property-test dependency + sample invariant test + regression cache"},
        {"label": "[3] e2e × <lang>",       "description": "Scaffold Playwright project + 1 page-object example + trace viewer"},
        {"label": "[4] load × <lang>",      "description": "k6/oha script + SLO thresholds + profile-loop runbook"},
        {"label": "[5] mutation × <lang>",  "description": "mutmut/cargo-mutants/StrykerJS config + baseline mutation score"},
        {"label": "Add a custom cell",       "description": "Free-text — e.g. contract tests, chaos tests, visual regression"},
        {"label": "Skip a reco",             "description": "Drop one of the recommended cells — free-text reason"}
      ]
    }
  ]
}

Options are GENERATED dynamically — one per MATRIX_RECO cell PLUS the two catch-alls (Add custom, Skip). Substitute <lang> literally.

On Add a custom cell → single free-text line → regenerate preview → re-ask. On Skip a reco → free-text reason (logged in final report) → regenerate → re-ask.

2c — Budget check (soft cap)

If the final MATRIX has > 6 cells, emit a WARNING message (NOT AskUserQuestion):

WARNING: cells selected. Scaffolding + CI wiring for each is ~30 min of human review per cell. Consider splitting into two sessions (critical cells now, rest next week). Continue? Reply "yes" or re-run Phase 2.

Store the final MATRIX as a list of {type, lang, rationale} objects.

Verify-criterion

• MATRIX has ≥ 1 cell. Zero cells means nothing to do → stop with a message pointing at /test-gen.
• Every cell's type ∈ {fuzz, property, e2e, load, mutation, custom}.
• Every cell's lang ∈ LANGS (no phantom language).
• User explicitly confirmed the final matrix (not just auto-reco) — the multi-select click counts as the confirmation.