使用 Devise 进行控制器测试的问题

Question

我在 stackoverflow 上的第一篇文章...耶！无论如何，我正在尝试对 Ruby 192 和 Rails 3.0 上的设备进行简单的控制器测试。我在网上查了很多东西，但我被困住了。请帮帮我。 这是代码片段

require 'spec_helper'
require 'devise/test_helpers'

describe AttributeFunnel do
   include Devise::TestHelpers

  before(:each) do
    @request.env["devise.mapping"] = Devise.mappings[:admin]
  end

  it "should restrict access" do
    @user = Factory.build(:user, :email => "[email protected]",:password =>"abc123",:password_confirmation => "abc123" ,:agree_terms => 1)
    @user.save(:validate => false)
    @user.confirm!
    sign_in(@user)
  end
end

这是错误>>

NoMethodError: undefined method `request' for nil:NilClass
C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.4/lib/active_support/whiny_nil.rb:48:in `method_missing'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/devise-1.2.rc/lib/devise/test_helpers.rb:27:in `initialize'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/devise-1.2.rc/lib/devise/test_helpers.rb:67:in `new'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/devise-1.2.rc/lib/devise/test_helpers.rb:67:in `warden'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rspec-rails-2.5.0/lib/rspec/rails/adapters.rb:11:in `block (2 levels) in setup'

我把 @request.env 作为最后的手段。仍然无法工作:(