Cucumber和Capybara一直说我有一个名为`visit＆＃39;的未定义方法。

Question

当我尝试运行Wayne Ye的Instant Cucumber BDD How-to给我的一个例子时，我不断收到错误消息undefined method 'visit' (NoMethodError)。我安装了很多宝石，我想我已经在我的项目文件夹上运行了所有必要的命令。

我安装的设置说明是：

gem install selenium-cucumber
gem install bundler
gem install cucumber-rails
gem install launchy
gem install database_cleaner
gem install factory_girl_rails
gem install webmock
gem install pickle
gem install spork-rails
gem install nokogiri
gem install ffi
gem install capybara
chdir C:\DevKit
ruby dk.rb init
ruby dk.rb install
gem install json
gem install sqlite3
<project folder>cucumber --init
<project folder>bundler init
<project folder>bundler install

我试图运行的例子来自本书，看起来像这样。

Amazon.features

Feature: Shopping in Amazon
As an internet user
I want to search stuff on Amazon
So that I can choose and buy items I like

@javascript
Scenario: Search for baseball gloves
   Given I am on Amazon homepage
   When I enter "baseball glove" in the search box
   And I click "Go" button
   Then I should see a list of results related with Baseball Gloves

step_definitions / amazon_search_steps.rb

Given /^I am on Amazon homepage$/ do
 visit "http://www.amazon.com"
end

When /^I enter "(.*?)" in the search box$/ do |keywords|
 fill_in "Search", :with => keywords
end

When /^I click "Go" button$/ do
 click_button "Go"
end

Then /^I should see a list of results related with Baseball Gloves/ do
 page.should have_content("#centerBelow")
end

运行时，我收到以下错误消息。

在线查看，解决方案似乎是将以下行添加到我的spec_helper.rb文件中，但我不知道哪一行，而且我尝试过的都没有。

config.include Capybara::DSL

编辑：按照我的env.rb文件要求。

完整路径为C：\ Ruby22-x64 \ lib \ ruby​​ \ gems \ 2.2.0 \ gems \ cucumber-rails-1.4.3 \ features \ support \ env.rb

$:.unshift(File.dirname(__FILE__) + '/../../lib')
require 'rubygems'
require 'bundler/setup'
require 'rspec/expectations'
require 'aruba/cucumber'
if(ENV['ARUBA_REPORT_DIR'])
  # Override reporting behaviour so we don't document all files, only the ones
  # that have been created after @aruba_report_start (a Time object). This is
  # given a value after the Rails app is generated (see cucumber_rails_steps.rb)
  module Aruba
    module Reporting
      def children(dir)
        children = Dir["#{dir}/*"].sort

        # include
        children = children.select do |child|
          File.directory?(child) ||
          (@aruba_report_start && File.stat(child).mtime > @aruba_report_start)
    end

        # exclude
        children = children.reject do |child|
          child =~ /Gemfile/ ||
          child =~ /\.log$/
        end

        children
      end
    end
  end
end