Mock function as prop

babel.config.js

module.exports = {
  presets: ['@babel/preset-react', '@babel/preset-env']
}

index.test.js

import React from 'react'
import Enzyme, { mount } from 'enzyme'
import Adapter from 'enzyme-adapter-react-16'

Enzyme.configure({ adapter: new Adapter() })

const Foo = ({ onClick }) => {
  const handleClick = () => {
      onClick()
  }
  return <button onClick={handleClick} />
}

test('Foo calls onClick when button is clicked', () => {
  const clickMock = jest.fn()
  const  wrapper = mount(<Foo onClick={clickMock} />)
  wrapper.find('button').simulate('click')
  expect(clickMock).toHaveBeenCalled()
})

package.json

{
  "dependencies": {
    "@babel/preset-env": "^7.10.2",
    "@babel/preset-react": "^7.10.1",
    "babel-jest": "^26.0.1",
    "enzyme": "^3.11.0",
    "enzyme-adapter-react-16": "^1.15.2",
    "jest": "^26.0.1",
    "react": "^16.13.1",
    "react-dom": "^16.13.1"
  }
}