ruby-on-rails-3 - 无法用 capybara 测试 rails3-bootstrap-devise-cancan

Question

我正在使用带有默认测试套装设置的https://github.com/RailsApps/rails3-bootstrap-devise-cancan 。我的规范/请求文件夹中有一个简单的规范

require 'spec_helper' 

describe "Feedbacks" do
  describe "guest must be denied to visit index path" do
    before { visit feedbacks_path }
    page.should have_selector ".alert", text: "Denied" 
  end
end

我遇到错误“未定义的局部变量或方法‘页面’ for.....”，试图运行这个测试。

我有

  require 'capybara/rails'

和

RSpec.configure do |config|
  .....
  .......
  config.include(Capybara::DSL)

在我的 spec_healper

在 gemfile "gem "capybara", ">= 2.0.3", :group => :test"

请帮我摆脱这个烦人的错误....