水豚/硒与rspec之前：所有钩子 [英] capybara/selenium with rspec before :all hook

问题描述

为了减少使用硒的页面访问次数，我想从 before：all 钩子调用visit方法，并用一个命令运行所有示例页面加载。但是，当我指定 before：all 和 before：each 时，浏览器将打开，但从未访问过该URL。下面是一个简化的示例...

In an attempt to reduce the number of page visits with selenium, I wanted to call the visit method from a before :all hook and run all my examples with a single page load. However, when I specify before :all vs before :each, the browser opens, but the url is never visited. Below is a simplified and contrived example...

describe 'foobar', :js => true do
  before :all do
    Capybara.default_wait_time = 10
    obj = Factory(:obj)
    visit obj_path(obj)
  end

  it 'should have foo' do
    page.should have_content('foo')
  end

  it 'should have bar' do
    page.should have_content('bar')
  end
end

当我将其设置为 before：each 之前，它可以工作，但是页面加载了两次。这是水豚的局限性吗？

When I set it to before :each, it works, but the page loads twice. Is this a limitation of Capybara?

推荐答案

问题原因

第二个示例不起作用，因为Capybara在每个RSpec示例之后都会重置会话。此时，您在 所访问的页面：all 不再打开。这是水豚的明显行为。它位于 capybara 宝石中，位于 /lib/capybara/rspec.rb 下：

Cause of problem

The second example doesn't work because because Capybara resets the session after each RSpec example; the page you visit-ed in your before :all block is no longer open at that point. This an explicit behavior of Capybara. It's in the capybara gem, under /lib/capybara/rspec.rb:

config.after do
  if self.class.include?(Capybara::DSL)
    Capybara.reset_sessions!
    Capybara.use_default_driver
  end
end

我在Google周围搜索几个小时后，发现还有其他几个人为此苦苦挣扎，但无济于事。

I Googled around for a couple of hours and found several others struggling with this, to no avail really.

我还发现了补丁，该漏洞将允许Capybara配置为 not 以重置会话，但建议的是Capybara创建者 jnicklas 拒绝了提取请求。

I also found that a patch that would allow Capybara to be configured not to reset the session after each example has been proposed ... but Capybara creator jnicklas declined the pull request.

我找到的最快（虽然可能不是最好）可行的解决方案（到目前为止）就是猴子补丁水豚：

The quickest -- though perhaps not the best -- workable solution I've found (so far) is to monkey-patch Capybara thusly:

module Capybara                                                                                                                                                                                  
  class << self                                                                                                                                                                                  
    alias_method :old_reset_sessions!, :reset_sessions!                                                                                                                                          
    def reset_sessions!; end                                                                                                                                                                     
  end                                                                                                                                                                                            
end

这只会使 reset_sessions ！在被调用时什么也不做。注意：当心意外的副作用！ （如果以后需要再次执行默认的重置行为，则始终可以在代码中稍后恢复 alias_method 。）

This just makes reset_sessions! do nothing when it gets called. Note: Beware of unintended side-effects! (You can always revert the alias_method later on in your code if you need the default resetting behavior to happen again.)

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