Confidence in your code comes from testing. This unit covers the testing pyramid:
unit testing (Jest, Vitest), integration testing, and end‑to‑end testing (Cypress,
Playwright). You will also learn test‑driven development (TDD), mocking, and testing
React components with React Testing Library.
Unit Learning Outcomes
Write unit tests with Jest/Vitest (matchers, mocks, spies).
Test React components with React Testing Library.
Implement integration tests for API endpoints.
Build end‑to‑end tests with Cypress or Playwright.
Apply Test‑Driven Development (TDD) and test coverage metrics.