Very minimalistic enzyme test of two components

enzyme-two-components.spec.js

import React from 'react';
import { mount } from 'enzyme';
import ParentComponent from './ParentComponent';
import ChildComponent from './ChildComponent';

describe('Parent component', () => {
  it('adds and removes child component from the DOM', async () => {
    const wrapper = mount(<ParentComponent />);
    
    //Find button in Parent component
    wrapper
      .find('button')
      .filterWhere(x => x.text() === 'Parent component button')
      .simulate('click');

    expect(wrapper.exists(ChildComponent)).toBe(true);
    
    //Find button deeper, in Child component
      wrapper
      .find('button')
      .filterWhere(x => x.text() === 'Child component button')
      .simulate('click');
    
    expect(wrapper.exists(ChildComponent)).toBe(false);

  });
});