# Establish Unit Test Foundation

Introduce a maintainable unit-test baseline around core domain behavior without over-mocking implementation details.

## Purpose

This is a publishable P0 built-in DevRunbook package. It is designed for the `execute` work mode with default autonomy `verify` and risk tier `moderate`.

## Required context

- Critical modules: List the modules or behavior that need the first unit-test coverage.
- Test framework preference: State an existing or preferred test framework, or leave blank to follow repository conventions.

## Completion

- Critical behavior has deterministic tests.
- Test command is documented and integrated into validation.
- Validation evidence and unresolved limitations are reported honestly.

## Quality status

Editorially reviewed and covered by static structure and determinism fixtures. It is not represented as execution-validated or battle-tested until the platform stores corresponding evidence.