Add this code to Test/Unit test_helper.rb to be able to use Capybara in your integration tests

test_helper_additons_for_capybara.rb

# This is working in a Rails 3/1.9.2 app
# For using Capybara in Test/Unit Integration tests -- majority of this taken from the tartare-rails gem
# Make sure you have the capybara gem installed -- gem install capybara
# You can also create a folder: Rails_root/test/integration/helpers and place Files within to abstract some of the Capybara steps....

require 'capybara/rails'

module ActionController

  class IntegrationTest
    include Capybara

    Capybara.register_driver :selenium do |app|
      Capybara::Driver::Selenium.new(app, :browser => :firefox)
    end

    Capybara.default_driver = :selenium
    Capybara.ignore_hidden_elements = true 

    self.use_transactional_fixtures = false
    
    # load integration test helpers
    Dir.glob("test/integration/helpers/*.rb").each do |helper_file|
      # for some reason the Dir.glob starts at rails root but when requiring, it starts within test/*
      require helper_file.gsub(/test\//, '')  
    end
    
  end
  
end