Bir post "react testing library" bilan

TLDR:

A modern frontend testing pyramid prioritizes fast unit tests for pure logic, high-signal integration and component tests for real UI behavior, and a small set of E2E checks for critical user journeys. This guide compares Jest vs Vitest, Cypress vs Playwright, and shows how Feature-Sliced Design creates clear boundaries and public APIs that make tests more stable, refactor-friendly, and scalable in large codebases.