ruby-on-rails - VCR 正在返回 UnhandledHTTPRequestError

Question

我有一个网站可以保存用户提交的链接。 create 操作接受一个 url，并从 html 中的 og:tags 中提取数据。该应用程序本身运行良好，但我在使用 VCR 的 RSpec 中对其进行测试时遇到了问题。

测试在没有 VCR 的情况下顺利通过，但需要很长时间(实际代码有多个 HTTP 请求)。当我尝试使用 VCR 运行测试时，出现以下错误。我该如何解决这个问题？

Failure/Error: click_button 'submit'
VCR::Error::UnhandledHTTPRequestError:
   ================================================================================
   An HTTP request has been made that VCR does not know how to handle:
     GET http://espn.go.com/golf/masters13/story/_/id/9171606

links_controller.rb

def create
  @link = Link.new(params[:link])
  if @link.save
    @link.title_from_url(@link.url)
  else
    render action: "new"
  end
end

链接.rb

def title_from_url(url)
  if !Nokogiri::HTML(open(url)).css("meta[property='og:title']").blank?
    self.title = Nokogiri::HTML(open(url)).css("meta[property='og:title']").first.attributes["content"].text
    self.save      
  end
end

link_pages_spec.rb

require 'spec_helper'

describe 'Link' do
  subject { page }
  before do
    visit root_path  
    click_link "create link"
  end
  describe "should be created with valid form" do
    VCR.use_cassette "link/create" do
      before do
        fill_in "enter url", with: "http://espn.go.com/golf/masters13/story/_/id/9171606"
        click_button "submit"
      end
      it { should have_selector('h2', text:'Adam Scott 1st Aussie to win Masters')}        
    end
  end
end

spec/support/vcr_setup.rb

VCR.configure do |c|   
  c.cassette_library_dir = 'spec/vcr_cassettes'
  c.hook_into :fakeweb
end

Answer 1

我有两处错误。首先，需要通过 capybara-mechanize gem 设置我的 Capybara.current_driver = :mechanize。其次，需要将 VCR block 放在 it block 中(而不是描述)。所以下面的代码有效。

require 'spec_helper'

describe 'Link' do
  subject { page }
  it "should be created with valid form" do
    VCR.use_cassette "link/create" do
      Capybara.current_driver = :mechanize
      visit root_path  
      click_link "create link"
      fill_in "enter url", with: "http://espn.go.com/golf/masters13/story/_/id/9171606"
      click_button "submit"
      page.should have_selector('h2', text:'Adam Scott 1st Aussie to win Masters')        
    end
  end
end