react enzyme simulate click sub component code example

Example 1: react enzyme simulate click sub component

//Counter.js
import React from 'react'

function Counter() {
  const [count, setCount] = React.useState(0)

  const onClick = () => setCount((prevState) => prevState + 1)

  return (
    <div>
      <button onClick={onClick}>{count}</button>
    </div>
  )
}

export default Counter

//App.js
import React from 'react'
import Counter from './Counter'

const App = (props) => {
  return (
    <>
      <Counter />
    </>
  )
}

export default App

//App.test.js
import React from 'react'
import { mount } from 'enzyme'
import App from './App'
import Counter from './Counter'

describe('Counter Group', () => {
  it('calls incCounter function when button is clicked', () => {
    const wrapper = mount(<App />)
    const subComponent = wrapper.find(Counter)
    const initClickCount = 2

    expect(subComponent.find('button').exists()).toBeTruthy()

    for (let i = 0; i < initClickCount; i++) {
      subComponent.find('button').simulate('click')
    }

    expect(subComponent.find('button').text()).toContain(2)

    console.log(wrapper.debug())
  })
})

Example 2: react enzyme simulate click sub component

/**
 * This test passes with or without the onMouseOver/onMouseLeave handlers.
 * In a real browser, onClickMock is not called without those handlers.
 */
const data = [
  {title: 'Option 1', description: 'a cool option'}
];
it('should invoke a childs onClick handler when the child is clicked', () => {
  const onClickMock = jest.fn();
  const component = shallow(
    <Dropdown
      buttonContent='Dropdown'>
      <ul>
        { data.map((item, index) => {
          return (
            <li
              key={ index }
              onClick={ onClickMock }
              data-test-section={ `dropdown-item-${index}` }>
              { item.title }
            </li>
          );
        })
      }
    </ul>
  </Dropdown>
);

   component.find('button').simulate('click');
   component.find('[data-test-section="dropdown-item-1"]').simulate('click');
   expect(onClickMock.mock.calls.length).toBe(1);
 });