Checkbox.spec.js

import React from 'react';
import { shallow, mount } from 'enzyme';
import Checkbox from 'components/Form/Checkbox';
import expect from 'expect';
import 'jsdom-global/register';

describe('<Checkbox />', () => {
  it('adds checked attribute to input', () => {
    const wrapper = shallow(<Checkbox checked />);
    const input = wrapper.find('input');

    expect(input.props().defaultChecked).toBe(true);
  });

  it('adds disabled attribute to input', () => {
    const wrapper = shallow(<Checkbox disabled />);
    const input = wrapper.find('input');

    expect(input.props().disabled).toBe(true);
  });

  it('calls the onChange function', () => {
    const onChange = expect.createSpy();
    const wrapper = mount(<Checkbox onChange={onChange} />);
    const input = wrapper.find('input');

    input.simulate('change');
    expect(onChange).toHaveBeenCalled();
  });
});