Testing Foo interaction using jest + enzyme + enzyme-to-json

Foo-test.js

'use strict';

const Foo = require('../Foo');
const React = require('react');

import { mount } from 'enzyme';
import { mountToJson } from 'enzyme-to-json';

describe('Foo', () => {
        it('simulate a change event using enzyme', () => {
                const wrapper = mount(<Foo />);
                const input = wrapper.find('input');
                input.node.value = 'this is a new value';
                input.simulate('change', input);
                expect(mountToJson(wrapper)).toMatchSnapshot()
        })
})