mechanize_patch.rb

require 'www/mechanize'

# Patches WWW::Mechanize for Cucumber + Webrat

module WWW
  class Mechanize
    def self.log_disabled
      @@log ||= Logger.new(STDOUT)
    end

    class File
      attr_accessor :redirects

      def redirect?
        redirects > 0
      end

      def response_code
        code.to_i
      end

      def error?
        (500..599).include?(response_code)
      end

      def success?
        (200..299).include?(response_code)
      end

      def unauthorized?
        response_code == 401
      end
    end

    # Mechanize throws exceptions for certain HTTP status codes.
    # We want to catch these and still create a page.
    def fetch_page_with_secret_sauce(params)
      begin
        page = fetch_page_without_secret_sauce(params)
      rescue ResponseCodeError => e
        page = e.page
      end
      page.redirects ||= params[:redirects].to_i
      page
    end
    alias_method :fetch_page_without_secret_sauce, :fetch_page
    alias_method :fetch_page, :fetch_page_with_secret_sauce
  end
end

patches_for_env.rb

require 'webrat'
require 'action_controller'
require 'test/unit'

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

World do
  Webrat::Session.new(Webrat::MechanizeAdapter.new)
end

World(Webrat::Matchers)
World(Test::Unit::Assertions)
World(ActionController::TestCase::Assertions)
World(ActionController::Assertions::ResponseAssertions)