- **Description:** Write automated tests using Jest and Supertest - **Activities:** - Setup test database environment and Prisma test client. - Unit tests for services (Auth, Token, Queue Calculation). - Integration tests via Supertest: - Full booking flow (Register → Book → Queue). - Role access prevention. - Mock external services (Mock the ML API axios calls, mock Redis). - Achieve ≥ 80% test coverage target. - **Deliverables:** Jest test suite, coverage reports, mocked external services