How do you unit test a custom React hook like useCounter?
This tests whether you know hooks must run inside a component and that renderHook provides that scaffold. A strong answer names renderHook and act, explains result.current access, and warns against calling hooks directly.
This tests your understanding of the Rules of Hooks and the testing infrastructure that shields you from them. A good answer identifies renderHook as the essential utility because it mounts the hook inside a real React test component so it executes in a valid component context. You should mention act for state transitions, result.current for reading returns, and rerender or unmount for lifecycle coverage.
Read the original → react-hooks-testing-library.com
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