Quality Engineering

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1. 1 Explain the testing pyramid (unit, integration, e2e) and where frontend component tests fit. Easy
2. 2 What is the difference between a mock, a stub, and a spy? Give a Jest example of each. Medium
3. 3 Explain React Testing Library's guiding principle of querying by accessibility roles rather than implementation details. Medium
4. 4 How would you test a component that makes an async `fetch` call, mocking the network layer? Medium
5. 5 Explain Jest snapshot testing — what are its pitfalls, and when does it provide false confidence? Medium
6. 6 How do you test a custom React hook in isolation using `renderHook`? Medium
7. 7 Explain test flakiness caused by relying on real timers, and how `jest.useFakeTimers()` helps. Hard