tdd-best-practices

Test-Driven Development guidance. Use when writing tests before implementation, applying Red-Green-Refactor, testing Value Object contracts, typed domain failures/Results, DDD Aggregates, Domain Events/subscribers, transaction or cache boundaries, data migrations/backfills, Criteria/query adapters, repository contracts or persistence adapters, choosing between test doubles, deciding test granularity, reviewing test suite quality, or diagnosing brittle tests.