ruby-on-rails – 未定义的局部变量或方法capybara rspec

$rspec . -e "PasswordResets"
/spec/requests/password_resets_spec.rb:9:in `block (2 levels) in <top (required)>': undefined local variable or method `root_path' for #<Class:0x00000003bfa100> (NameError)

root_path确实存在.我有多个其他测试可行.但是看起来我只能在方法在前一个区块内时使用Capybara.这有效：

require 'spec_helper'
describe "PasswordResets" do
  subject { page }
  describe "it emails user when requesting a password reset" do
    before do
      visit root_path
    end
  end
end

这会产生错误：

require 'spec_helper'
describe "PasswordResets" do
  subject { page }
  describe "it emails user when requesting a password reset" do
    visit root_path
  end
end

这有效：

require 'spec_helper'
describe "PasswordResets" do
  it "emails user when requesting a password reset" do
    visit root_path
  end
end

我想要做的是使用主题{page}但是能够使用capybara而不必使用before do end块.知道我做错了什么吗？

我的spec_helper.rb文件：

ENV["RAILS_ENV"] ||= 'test'
require File.expand_path("../../config/environment",__FILE__)
require 'rspec/rails'
require 'rspec/autorun'
require 'capybara/rspec'

Dir[Rails.root.join("spec/support/**/*.rb")].each {|f| require f}

RSpec.configure do |config|
  config.fixture_path = "#{::Rails.root}/spec/fixtures"
  config.use_transactional_fixtures = true
  config.infer_base_class_for_anonymous_controllers = false
end

我使用的是Capybara 1.1.2,Rspec 2.8.1的Rails 3.2.