How to work with React Hooks in jest/enzyme tests?

Question

JavaScript

I have a component that has a useState and an updateTotalSum function that triggers setTotalSum. How can I test and get value from useState(totalSum) and also call updateTotalSum function

//My component

const SomeComponent = props => {
  const [totalSum, setTotalSum] = useState(null);
  
  const updateTotalSum = sum => {
  //...do something
  setTotalSum(sum);
  }
  
  return <AnotherComponent updateTotalSum={updateTotalSum} totalSum={totalSum} />
}

//My tests

// Пример теста для компонента-класса. Все корректно работает.
it('should correctly called updateTotalSum method', () => {
  const wrapper = shallow(<SomeComponent />;
  wrapper.instance().updateTotalSum(1000);
  expect(wrapper.state('totalSum')).toBe(1000);
});

// Тест для функционального компонента. Ожидаемо, не работает
it('should correctly called updateTotalSum method', () => {
  const wrapper = shallow(<SomeComponent />;
  wrapper.updateTotalSum(1000);
  expect(wrapper.totalSum).toBe(1000);
});

Answer 1

Enzyme doesn't support hooks yet.