Testing Frameworks

A complete curriculum for the tools that verify JavaScript and TypeScript applications, from unit tests to full end-to-end journeys. The category covers Vitest and Jest for unit and integration testing, Playwright and Cypress for browser-based E2E testing, and the trade-offs between them. Each series is self-contained, but together they form a decision framework: what to test at which layer, which runner fits which project, and when a Vite-native tool beats a Jest-compatible one.

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