在测试Rails 3控制器时遇到一些意外错误

class Service < ActiveRecord::Base
  attr_accessible :service_type #, ...

  SERVICE_TYPES = {
    :restaurant => \"restaurant\",
    :retailer   => \"retailer\"
  }

  SERVICE_TYPES.values.each do |method|
   define_method method.pluralize.to_sym do
      where(:service_type => method)
   end
  end

  def domestic
    where(:country => \'USA\')
  end

  def international
    where(\"country != \'USA\'\")
  end
end

http://myapp/services        # <- Lists all service types
http://myapp/restaurants     # <- Lists all restaurant-type services
http://myapp/restaurants/foo # <- Lists a specific restaurant (using friendly_id gem)
http://myapp/retailers       # <- Lists all retailer-type services
http://myapp/retailers/bar   # <- Lists a specific retailer

controller :services, :via => [:get] do 
  match \'/services\'          => :index
  match \'/:service_type\'     => :service_index, :as => \'service_type\', :constraints => { :service_type => Regexp.new(Service::SERVICE_TYPES.values.map{|s| Regexp.escape(s.pluralize) }.join(\'|\')) }
  match \'/:service_type/:id\' => :show,          :as => \'service\',      :constraints => { :service_type => Regexp.new(Service::SERVICE_TYPES.values.map{|s| Regexp.escape(s.pluralize) }.join(\'|\')) }
end

    services GET  /services(.:format)                              {:controller=>\"services\", :action=>\"index\"}
service_type GET  /:service_type(.:format)                         {:service_type=>/restaurants|retailers/, :controller=>\"services\", :action=>\"service_index\"}
     service GET  /:service_type/:id(.:format)                     {:service_type=>/restaurants|retailers/, :controller=>\"services\", :action=>\"show\"}

class ServicesController < ApplicationController
  def index
    @service_types = Service::SERVICE_TYPES.values
    @page_title = \"Services\"
  end

  def service_index
    @service_type  = params[:service_type]
    @domestic      = Service.send(@service_type).domestic
    @international = Service.send(@service_type).international
    @page_title    = @service_type.capitalize
  end

  def show
    @service = Service.find(params[:id])
    @page_title = \"Services - #{@service.name}\"
  end
end

require \'spec_helper\'

describe ServicesController do
  describe \"GET \'index\'\" do
    it \"should be successful\" do
      get :index
      response.should be_success
    end

    it \"should have the right title\" do
      get :index
      response.should have_selector(
        \"title\", 
        :content => \"#{@base_title}Services\"
      )
    end

    it \"should have a link to each service\" do
      get :index
      Service::SERVICE_TYPES.values.each do |service_type|
        response.should have_selector(\"a\", :href => service_type_path(service_type.pluralize),
                                           :content => service_type.pluralize)
      end
    end
  end

  describe \"GET \'service_index\'\" do
    Service::SERVICE_TYPES.values.each do |service_type|
      context service_type.pluralize do
        it \"should be successful\" do
          get :service_index, :service_type => service_type.pluralize
          response.should be_success
        end

        it \"should have the right title\" do
          get :service_index, :service_type => service_type.pluralize
          response.should have_selector(
            \"title\", 
            :content => \"#{@base_title}#{service_type.pluralize.capitalize}\"
          )
        end

        it \"should have a link to each service\" do
          get :service_index, :service_type => service_type.pluralize
          Service.send(service_type.pluralize).each do |service|
            response.should have_selector(\"a\", :href => service_path(service_type.pluralize, service),
                                               :content => service.name)
          end
        end
      end
    end
  end

  describe \"GET \'show\'\" do
    it \"should be successful\" do
      get \'show\'
      response.should be_success
    end
  end
end

get

\"should be successful\"

  1) ServicesController GET \'index\' should have the right title
     Failure/Error: response.should have_selector(
       expected following output to contain a <title>Services</title> tag:
       <!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">
     # ./spec/controllers/services_controller_spec.rb:12:in `block (3 levels) in <top (required)>\'

  2) ServicesController GET \'index\' should have a link to each service
     Failure/Error: response.should have_selector(\"a\", :href => service_type_path(service_type.pluralize),
       expected following output to contain a <a href=\'/restaurants\'>Restaurants</a> tag:
       <!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">
     # ./spec/controllers/services_controller_spec.rb:21:in `block (4 levels) in <top (required)>\'
     # ./spec/controllers/services_controller_spec.rb:20:in `each\'
     # ./spec/controllers/services_controller_spec.rb:20:in `block (3 levels) in <top (required)>\'

  3) ServicesController GET \'service_index\' restaurants should have the right title
     Failure/Error: response.should have_selector(
       expected following output to contain a <title>Restaurants</title> tag:
       <!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">
     # ./spec/controllers/services_controller_spec.rb:37:in `block (5 levels) in <top (required)>\'

  4) ServicesController GET \'service_index\' restaurants should have a link to each service
     Failure/Error: response.should have_selector(\"a\", :href => service_path(service_type.pluralize, service),
       expected following output to contain a <a href=\'/restaurants/foo\'>Foo</a> tag:
       <!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\" \"http://www.w3.org/TR/REC-html40/loose.dtd\">
     # ./spec/controllers/services_controller_spec.rb:46:in `block (6 levels) in <top (required)>\'
     # ./spec/controllers/services_controller_spec.rb:45:in `block (5 levels) in <top (required)>\'