Options.spec.jsx

import React from 'react';
import { shallow } from 'enzyme';

import Options from './';

describe('test Options component', () => {
  it('instance method handleAdd should be triggered when add button gets clicked', () => {
    const enzymeWrapper = shallow(<Options />);
    
    enzymeWrapper.instance().handleAdd = jest.fn();

    enzymeWrapper.find('button').at(0).simulate('click');

    expect(enzymeWrapper.instance().handleAdd).toHaveBeenCalledTimes(1);
  });
});