Testing and handoff matter when a product must continue without its original author. I protect high-risk journeys and leave a reproducible setup instead of chasing an arbitrary coverage percentage.

Priority areas are sign-in, money, permissions, transformations, migrations, and core integrations. Scope may include unit, contract, or end-to-end tests, CI, fixtures, README, environment diagrams, and troubleshooting guidance. Acceptance requires a new developer to start the project from instructions, tests to catch an intentional defect, no embedded secrets, and a release reproducible from a clean environment.