typescript-testing-backend

Use when writing or reviewing TypeScript backend tests — Jest unit tests for services/controllers (mocked Prisma) or Supertest integration tests against a real isolated PostgreSQL test database. Triggers on edits to *.service.test.ts, *.controller.test.ts, *.integration.test.ts, service/controller/API test files (.ts, not .tsx) under /tests/, or mentions of "backend test", "service test", "API test", "database test".