exports.config = {
  // add other options here as normal
  
  capabilities: [
    { browserName: 'chrome'},
  ],
  
  // This is the important part!!!
  onPrepare: () => {
    if ( this.config.chromeDriver ) require('./chromedriver').start(this.config);
  },

  after: () => {
    if ( this.config.chromeDriver ) require('./chromedriver').stop();
  },

  // custom option:
  chromeDriver: true,
};