## What
A **test value audit**: a heuristic that scores every test file under
`packages/*/src/**/__tests__/**` and
`packages/dashboard/app/**/__tests__/**` by how much real regression
signal it has encoded over its git history, then ranks **slow AND
low-value** files first as deletion candidates. This is the **evidence
base** for a human/follow-up deletion decision — **the script deletes
nothing**.
Motivated by AGENTS.md "Do Not Add Slow Tests" (FN-5048) + the
quarantine deletion ratchet: we want data on which slow tests are also
low-signal so they can be cut without losing coverage.
## How it scores (HEURISTIC, not ground truth)
Single whole-history `git log --name-status` pass; per-commit
classification (renames followed backward):
- **Positive** — `fix(...)`/`fix:` with sibling source change (+3), fix
alone (+2), `## Symptom Verification` regression marker (+3, FN-5893),
test added-with-source (+2)/alone (+1), plain test+source co-change
(+1.5).
- **Negative** — subject/body churn keywords
`flake/flaky/deflake/quarantine/stabiliz/appease/timeout/retry` (−3),
test-only modify with no source (−1), quarantine-ledger membership
current+historical (−5).
`valueScore` = sum of weights. `deletionPriority = durationMs / (1 +
max(0, valueScore))` (+ small net-negative boost), joined with
`scripts/test-timings.json` so slow + low-value surfaces first.
Recommendation: `delete` (≤0) / `review` (≤3) / `keep` (>3). A
`safeDelete` flag marks files meeting the ratchet's churn/quarantine
bar.
## Deliverables
- `scripts/test-value-audit.mjs` — runner (git IO + report generation)
- `scripts/lib/test-value-audit-lib.mjs` — pure, unit-tested scoring
logic
- `scripts/__tests__/test-value-audit.test.mjs` — 15 synthetic-record
unit tests
- `docs/test-value-audit.json` + `docs/test-value-audit.md` — generated
artifacts (top 40 + methodology + honest caveats: heuristic limits,
git-follow/squash-merge blind spots, lying subjects, timing snapshot)
## Verification
- `node scripts/test-value-audit.mjs` runs end-to-end (~1s), 2051 files
analyzed, writes both artifacts.
- `node --test scripts/__tests__/test-value-audit.test.mjs` → 15/15
pass.
- `eslint` clean on all three new source files.
No changeset (scripts + docs only; `@runfusion/fusion` runtime
unaffected).
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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