https://github.com/testing-library/react-hooks-testing-library useCounter.js import { useState , useCallback } from ' react ' function useCounter () { const [ count , setCount ] = useState ( 0 ) const increment = useCallback (() => setCount (( x ) => x + 1 ), []) return { count, increment } } export default useCounter useCounter.test.js import { renderHook , act } from ' @testing-library/react-hooks ' import useCounter from ' ./useCounter ' test ( ' should increment counter ' , () => { const { result } = renderHook (() => useCounter ()) act (() => { result . current . increment () }) expect ( result . current . count ). toBe ( 1 ) })