a_test.rb

require 'webrat'
Webrat.configure do |config|
  config.mode = :sinatra
end
class WebratTester
  include Webrat::Methods
  include Webrat::Matchers

  def test_it
    visit "http://www.google.com"
  end
end

#this failed
>> t = WebratTester.new
=> #<WebratTester:0x1c95828>
>> t.test_it

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/formatter/unicode' # Comment out this line if you don't want Cucumber Unicode support
#Cucumber::Rails.use_transactional_fixtures
Cucumber::Rails.bypass_rescue # Comment out this line if you want Rails own error handling 
                              # (e.g. rescue_action_in_public / rescue_responses / rescue_from)


# Load Lookup Data
Fixtures.reset_cache
fixtures_folder = File.join(RAILS_ROOT, 'db', 'fixtures', 'lookup')
fixtures = Dir[File.join(fixtures_folder, '*.yml')].map { |f| File.basename(f, '.yml') }
Fixtures.create_fixtures(fixtures_folder, fixtures)


require 'webrat'

Webrat.configure do |config|
  config.mode = :rails
end

require 'cucumber/rails/rspec'
require 'webrat/core/matchers'