Capybara to toggle poltergeist/selenium in RSpec features

capybara.rb

require "capybara/poltergeist"

Capybara.asset_host = "http://localhost:3000"

Capybara.register_driver :poltergeist do |app|
  Capybara::Poltergeist::Driver.new app, js_errors: true
end

Capybara.javascript_driver = :poltergeist

RSpec.configure do |config|
  config.before(:each, touchy_js: true) do
    Capybara.current_driver = :selenium
  end
  config.after(:each, touchy_js: true) do
    Capybara.use_default_driver
  end
end