# Testing and quality

## Principles
- Determinism is a contract: identical inputs must yield identical outputs.
- Offline-first: tests should pass without network access.
- Evidence-first: assertions cover evidence chains, not only verdicts.

## Test layers
- Unit and property tests for core libraries.
- Integration tests with PostgreSQL and Valkey.
- Contract tests for OpenAPI and schemas.
- End-to-end tests for scan, policy, and offline workflows.
- Replay verification against golden corpora.

## Quality gates
- Determinism checks on replay outputs.
- Interop checks against external tooling formats.
- Offline E2E runs as a release gate.
- Policy and schema validation in CI.