1import { renderHook, act } from '@testing-library/react-hooks'
2import useCounter from './useCounter'
3
4test('should increment counter', () => {
5  const { result } = renderHook(() => useCounter())
6
7  act(() => {
8    result.current.increment()
9  })
10
11  expect(result.current.count).toBe(1)
12})

1npm install --save-dev @testing-library/react-hooks

1import { useState, useCallback } from 'react'
2
3function useCounter() {
4  const [count, setCount] = useState(0)
5
6  const increment = useCallback(() => setCount((x) => x + 1), [])
7
8  return { count, increment }
9}
10
11export default useCounter