如何在纯 Ruby 中使用 Capybara（没有 Rails）？

我正在尝试让 Capybara 在一个简单的 Ruby 脚本中运行——即没有/在 Rails 之外。这是脚本：

require 'rubygems'
require 'capybara'
require 'capybara/dsl'

include Capybara

Capybara.current_driver = :selenium
Capybara.app_host = 'http://www.google.com'

visit('/')

问题是，当我运行这个时，我收到以下错误：

NameError: uninitialized constant Capybara::Session

at top level    in dsl.rb at line 52
method gem_original_require in custom_require.rb at line 36
method require  in custom_require.rb at line 36
at top level    in capybara_test.rb at line 3
method gem_original_require in custom_require.rb at line 31
method require  in custom_require.rb at line 31
at top level    in capybara_test.rb at line 

我究竟做错了什么？

更多信息：

• Mac OS X 10.5
• ruby 1.8.6 (2009-06-08 补丁级别 369) [universal-darwin9.0]
• 水豚 (0.3.9)

Thanks!

Neal

注意：根据 jnicklas 的评论，我尝试了这个，它与新的自述文件更匹配：

require 'rubygems'
require 'capybara'
require 'capybara/dsl'

Capybara.default_driver = :selenium
Capybara.app_host = 'http://www.google.com'

module MyCapybaraTest
  include Capybara

  def test_google
    visit('/')
  end
end

不幸的是，我仍然看到同样的错误：

NameError: uninitialized constant Capybara::Session

想法？

Thanks!

这似乎对我有用：

require 'rubygems'
require 'capybara'
require 'capybara/dsl'

Capybara.run_server = false
Capybara.current_driver = :selenium
Capybara.app_host = 'http://www.google.com'

module MyCapybaraTest
  class Test
    include Capybara::DSL
    def test_google
      visit('/')
    end
  end
end

t = MyCapybaraTest::Test.new
t.test_google