cucumber.yml

default: -r features/support/env.rb -r features/support/plain.rb -r features/step_definitions features/plain --format progress features --tags ~@pending
selenium: -r features/support/env.rb -r features/support/enhanced.rb -r features/step_definitions features/enhanced features/plain --format progress features --tags ~@pending

enhanced.rb

Webrat.configure do |config|
  config.mode = :selenium
  # Selenium defaults to using the selenium environment. Use the following to override this.
  # config.application_environment = :test
  config.application_address = 'localhost' 
  config.application_port = 4444
end

# this is necessary to have webrat "wait_for" the response body to be available
# when writing steps that match against the response body returned by selenium
World(Webrat::Selenium::Matchers)

Before do
  # truncate your tables here, since you can't use transactional fixtures*
  User.destroy_all
end

env.rb

# Sets up the Rails environment for Cucumber
ENV["RAILS_ENV"] = "test"
require File.expand_path(File.dirname(__FILE__) + '/../../config/environment')
require 'cucumber/rails/world'
require 'cucumber/formatters/unicode' # Comment out this line if you don't want Cucumber Unicode support
require 'webrat'
require 'webrat/rails'

require 'cucumber/rails/rspec'

plain.rb

require 'webrat/core/matchers'

# truncate your tables here if you are using the same database as selenium, since selenium doesn't use transactional fixtures
Cucumber::Rails.use_transactional_fixtures
Webrat.configure do |config|
  config.mode = :rails
end