qa-expert

A test strategy defines unit, integration, and E2E tests aligned with the testing pyramid. Plan coverage targets upfront, select appropriate frameworks like Jest or Playwright for your stack, and document which scenarios each test tier covers to ensure gaps are closed before development starts.

Unit tests validate individual functions in isolation; integration tests verify components work together; E2E tests simulate real user workflows end-to-end. The testing pyramid prioritizes many unit tests, fewer integration tests, and minimal E2E tests for efficient coverage and fast feedback.

Accessibility testing validates ARIA attributes, keyboard navigation, and screen reader compatibility against WCAG criteria. Combine automated checks with manual testing to verify color contrast, focus management, and semantic HTML so all users can navigate your application.

Test-Driven Development writes tests before implementation, ensuring coverage targets are met from the start and design decisions are testable. This workflow reduces bugs, clarifies requirements, and creates a safety net for refactoring across Jest, Vitest, PHPUnit, and other frameworks.

For E2E testing, use Playwright or Cypress to automate user interactions. For performance testing, Lighthouse measures web vitals and k6 simulates load. Framework choice depends on your platform; align tool selection with your CI/CD pipeline and team expertise.

Set explicit coverage targets—typically 70–90% depending on risk—using built-in coverage tools in Jest and Vitest. Monitor coverage in CI/CD to catch untested code paths early, combine unit and integration tests to reach targets efficiently, and prioritize covering critical user flows.