小编Dil*_*ter的帖子

我正在使用Ruby和以下教程（http://ngauthier.com/2014/06/scraping-the-web-with-ruby.html）构建一个简单的矿工。

这是我目前拥有的代码：

#!/usr/bin/ruby

require 'capybara'
require 'capybara/poltergeist'

include Capybara::DSL
Capybara.default_driver = :poltergeist

visit "http://dilloncarter.com"

all(".posts .post ").each do |post|
    title = post.find("h1 a").text
    url   = post.find("h1 a")["href"]
    date  = post.find("a")["datetime"]
    summary = post.find("p.preview").text


    puts title
    puts url
    puts date
    puts summary
    puts " "

end

并且我在加载gemfile时遇到错误，如下所示：

LoadError: cannot load such file -- capybara
from /Users/dilloncarter/.rvm/rubies/ruby-2.0.0-p353/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Users/dilloncarter/.rvm/rubies/ruby-2.0.0-p353/lib/ruby/site_ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from WP_Miner.rb:3
from /Users/dilloncarter/.rvm/rubies/ruby-2.0.0-p353/bin/irb:12:in `<main>'

我如何才能正确装载宝石？

运行一些测试并在每个项目上得到相同的错误：

Failures:

  1) Register Frozen Pizza should be $5.00 each
     Failure/Error: expect(subject.total).to eq 5.00

       expected: 5.0
            got: {"Frozen Pizza"=>1}

       (compared using ==)
     # ./register_spec.rb:11:in `block (3 levels) in <top (required)>'

  2) Register Corn should be $0.50 each
     Failure/Error: expect(subject.total).to eq 0.50

       expected: 0.5
            got: {"Corn"=>1}

       (compared using ==)
     # ./register_spec.rb:20:in `block (3 levels) in <top (required)>'

不知道是什么导致了这 16 个错误。这是规范文件的一部分：

require 'register'

require 'timecop'

describe Register do
  subject { described_class.new }

  describe 'Frozen Pizza' do
    it 'should be $5.00 each' do …