# AGENTS - Facet Tests

## Roles
- QA / test engineer: deterministic tests for facet extraction, drift, and VEX workflows.
- Backend engineer: align tests with facet library contracts and fixtures.

## Required Reading
- docs/README.md
- docs/07_HIGH_LEVEL_ARCHITECTURE.md
- docs/modules/platform/architecture-overview.md
- src/__Libraries/AGENTS.md
- Current sprint file under docs/implplan/SPRINT_*.md

## Working Directory & Boundaries
- Primary scope: src/__Libraries/StellaOps.Facet.Tests
- Test target: src/__Libraries/StellaOps.Facet
- Avoid cross-module edits unless explicitly noted in the sprint file.

## Determinism and Safety
- Use fixed timestamps and deterministic file paths in test data.
- Avoid Guid.NewGuid in fixtures unless required for isolation.

## Testing
- Cover drift detection, merkle roots, extraction filters, and VEX draft workflows.
- Add negative cases for invalid inputs and ensure deterministic golden vectors.