U21OCB06-Type script with Jest Testing Framework, KPR Institute Engineering and Technology, Autonomous Engineering Institution, Coimbatore, India

By the end of this one-credit (foundation) course, learners will be able to:

• Author robust TypeScript code: use types, interfaces, enums, generics, unions, and modules; handle async/await and promises; configure tsconfig.json for strict typing and path aliases.

• Adopt clean tooling practices: initialize and manage projects with npm, set up scripts, and apply linting/formatting (ESLint/Prettier) to maintain consistent code quality.

• Test effectively with Jest: write unit and integration tests using describe/it, assertions, test lifecycle hooks, and snapshots; configure jest.config.ts with ts-jest; test async code, timers, and edge cases.

• Mock with confidence: create spies/mocks/stubs for modules, HTTP clients, and databases; use manual/module mocks and dependency injection to isolate units.

• Measure and improve quality: generate coverage reports, set coverage thresholds, practice TDD for small features, and refactor code guided by failing/passing tests.

• Ship with confidence: run tests in CI (e.g., GitHub Actions), manage environment variables for tests, and document test strategy (test pyramid, naming conventions).

• Deliver a capstone artifact: a small TypeScript library or service (e.g., utility package or API client) with a comprehensive Jest test suite, ≥90% statement coverage, typed public API, and README with usage and test instructions.