> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cryptarium.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Fixtures & validation

> Positive and negative fixtures keep rule packs honest.

# Fixtures & validation

Every detector rule needs a positive *and* a negative fixture. The negative fixture is the one that matters — it encodes what the rule must not match.

## Layout

Fixtures live under `testdata/rules/<rule-id>/` in the repository (exact layout follows `DESIGN.md`).

## Commands

```bash theme={null}
make lint-rules
make test
make check   # fmt + lint + test — what CI runs
```

Regenerate goldens deliberately with `make golden` and review the diff — never blind-accept.

## Related

* [Adding a rule](/detectors/adding-a-rule)
* [Determinism](/concepts/determinism)