Chrome driver for Capybara

$ brew install chromedriver

#########################

Gemfile
  group :test do
    gem "chromedriver-helper"
    gem 'selenium-webdriver'
  end

########################

rails_helper.rb
  Capybara.register_driver :chrome do |app|
    Capybara::Selenium::Driver.new(app, :browser => :chrome)
  end
  Capybara.javascript_driver = :chrome
  Capybara.configure do |config|
    config.default_driver        = :chrome
  end