Breaking News: Grepper is joining You.com. Read the official announcement!

how to test useState in jest

Plain Pigeon answered on January 6, 2022 Popularity 9/10 Helpfulness 6/10

answer how to test useState in jest

how to test useState in jest

Comment

import { useState } from 'react';

export function useCounter(initial = 0) {
  const [count, setCount] = useState(initial);

  return [count, () => setCount(count + 1)];
}
Unit test
import { useCounter } from './Calculator';

const mockSetState = jest.fn();

jest.mock('react', () => ({
  useState: initial => [initial, mockSetState]
}));

test('Can increment from 1 to 2', () => {
  const [_, increment] = useCounter(1);

  increment();

  expect(mockSetState).toHaveBeenCalledWith(2);
});

Popularity 9/10 Helpfulness 6/10 Language javascript

Source: Grepper

Tags: javascript use-state

Link to this answer
Share Copy Link

Contributed on Jan 06 2022

Plain Pigeon

0 Answers Avg Quality 2/10

Continue with Google

By continuing, I agree that I have read and agree to Greppers's Terms of Service and Privacy Policy.

how to test useState in jest

Contents

More Related Answers

how to test useState in jest

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.