Unit Testing, Async Mocking, and Debugging Workflows

Strong engineers write resilient, maintainable test suites that test user behavior rather than implementation details. High-bar interview panels evaluate your approach to testing asynchronous interactions and custom hooks.

Master React Testing Library query hierarchies prioritizing accessible roles, eliminate act() warnings when testing async fetch requests with Mock Service Worker, test custom hooks using renderHook, and identify detached DOM nodes causing memory leaks.