Simple component test using Jest, React DOM and React

simple-test.js

// This file should be named as Button.spec.tsx

import * as React from 'react'
import * as ReactDOM from 'react-dom'
import Button from './'

describe('component Button', () => {
  it('renders without crashing', () => {
    const div = document.createElement('div')
    ReactDOM.render(<Button />, div)
    ReactDOM.unmountComponentAtNode(div)
  })
})