Use Jest and react test renderer for snap shot tests, including simulated click events.

Setup.js

/**
 * Responsible for displaying setup information based on props passed in.
 */
import React from 'react';
import { List } from 'immutable'
import ProxyStatus from './ProxyStatus'
import './Setup.css'

const Setup = (props) => {
  const proxyServers = (proxyServerList) => {
    return proxyServerList.map( (proxyServer) => {
      return <ProxyStatus key={proxyServer.get('url')} status={proxyServer.get('status')} url={proxyServer.get('url')} />
    })
  }

  return (
    <div className='Setup-panel'>
      <p className='Setup-subHead'>Spdz Proxy Servers</p>
      <button onClick={props.setupForRun}>
        Connect
      </button>
      {proxyServers(props.spdzProxyServerList)}
    </div>
  )
} 

Setup.propTypes = {
  setupForRun: React.PropTypes.func.isRequired,
  spdzProxyServerList: React.PropTypes.instanceOf(List).isRequired
}

export default Setup

Setup.test.js

import React from 'react'
import { List } from 'immutable'
import renderer from 'react-test-renderer'

import Setup from './Setup'
import { twoProxiesWith1Connected } from '../test_support/ProxyServerList'

describe('Setup display component rendering', () => {
  it('Renders as expected (compared to a snapshot) when passed properties', () => {

    const tree = renderer.create(
      <Setup setupForRun={() => {}} spdzProxyServerList={twoProxiesWith1Connected} />
    ).toJSON()

    expect(tree).toMatchSnapshot()
  })

  it('Executes the call back when the setup button is clicked', () => {
    //Need to use 
    const mockCallBack = jest.fn((e) => {})

    const tree = renderer.create(
      <Setup setupForRun={mockCallBack} spdzProxyServerList={List()} />
    ).toJSON()

    let button = tree.children.find((element) => {return (element['type'] === 'button')})

    button.props.onClick()
    expect(mockCallBack).toHaveBeenCalled()
  })
})