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SnapOtter/tests/fixtures/README.md
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# Test Fixtures
Shared test fixtures for the SnapOtter test suite. Organized in two tiers:
## Two-Tier Structure
**Tier 1: Tiny Synthetics (matrices/format coverage)**
Small, project-generated files for format-compatibility matrices and fast unit tests.
Located in `media/`, `documents/`, `data/`, `formats/`, and root-level `test-*` files.
**Tier 2: Real Heroes (depth/fidelity testing)**
Larger, content-representative files for integration and fidelity tests.
Located in `content/`. Each must be tracked in `manifest.json` with sha256 + provenance.
## Layout (Modality-First, Phase 6 Target)
```
tests/fixtures/
index.ts # Typed registry (import paths from here, not raw strings)
manifest.json # sha256 + bytes + provenance for content/ heroes
gen-manifest.mjs # Script to re-stamp manifest hashes
LICENSES.md # Provenance audit trail
content/ # Tier-2 real heroes
formats/ # Tier-1 format samples (35 formats incl. RAW)
media/ # Tier-1 tiny audio/video samples
documents/ # Tier-1 tiny document samples
data/ # Tier-1 tiny data samples (csv, json, xml, etc.)
hostile/ # Malformed/bomb/polyglot files for rejection tests
security/ # XXE, SSRF test vectors
image/ # (Phase 6) modality-first target dir
video/ # (Phase 6) modality-first target dir
audio/ # (Phase 6) modality-first target dir
document/ # (Phase 6) modality-first target dir
data/ # (Phase 6) modality-first target dir
```
## Using the Registry
Always import paths from `tests/fixtures/index.ts` rather than hard-coding paths:
```ts
import { fixtures, readFixture } from "../../fixtures/index.js";
// Direct path access
const pngPath = fixtures.image.base.png200;
// Read bytes
const buffer = readFixture(fixtures.image.base.png200);
// Format accessor (for matrix iteration)
const arwPath = fixtures.image.formats("arw");
const mp4Path = fixtures.video.tiny("mp4");
```
## Adding a Fixture
1. Add the file to the appropriate directory
2. Add a key in `tests/fixtures/index.ts` pointing to it
3. Run `node tests/fixtures/gen-manifest.mjs` if the file is in `content/`
4. Fill in `sourceUrl` and `license` in `manifest.json` (required for Phase 2+)
5. Update `LICENSES.md` with the provenance record
6. Run the guards: `pnpm vitest run tests/unit/fixtures/ tests/integration/fixtures/`
## Licensing Gate
Phase 1 allows `UNVERIFIED` provenance. Phase 2 enforces that every `content/` hero
has a verified license (CC0, CC-BY, CC-BY-SA, or public-domain). See `LICENSES.md`
for the current audit status.
## Guard Tests
Four guard tests protect fixture integrity:
- **fixture-resolve** (unit): every registry path exists and is non-empty
- **fixture-budget** (unit): per-extension size caps prevent bloat
- **fixture-manifest** (unit): sha256/bytes in manifest.json match disk
- **fixture-integrity** (integration): real heroes decode through Sharp/ffprobe/qpdf