Testing: Write Tests That Catch Real Bugs

Write, structure, and maintain tests across unit, integration, E2E, accessibility, and performance layers. The goal is tests that catch regressions, document behavior, and run fast in CI - not tests that exist to inflate coverage numbers.

Target versions (July 2026):

• Vitest 4.1.10, Jest 30.4.2
• Playwright 1.61.1, Cypress 15.19.0
• pytest 9.1.1, pytest-cov 7.1.0
• Go 1.26.5 (testing stdlib, testing/synctest GA)
• Rust 1.97.1 (cargo test, cargo-nextest 0.9.140)
• Testing Library 16.3.2 (@testing-library/react)
• axe-core 4.12.1 (@axe-core/playwright)
• Grafana k6 2.1.0 (major release; review migration notes before upgrading load tests)

When to use