我有一个使用capybara/poltergeist和:js => true的rspec功能测试，并且正在做一些非常简单的事情：
visit borrow_path
click_on "Get Started"
page.should have_content "Create Your Account"
单击Get Started会将用户带到我们的注册页面，然后poltergeist会在page.should have_content断言上引发超时错误，尽管页面的屏幕截图确认内容实际上是在页。
错误是：
Failure/Error: page.should have_content "Create Your Account"
Capybara::Poltergeist::TimeoutError:
Timed out waiting for response to {"name":"find","args":["xpath","/html"]}. It's possible that this happened because something took a very long time (for example a page load was slow). If so, setting the Poltergeist :timeout option to a higher value will help (see the docs for details). If increasing the timeout does not help, this is probably a bug in Poltergeist - please report it to the issue tracker.
# ./spec/features/borrower/signup_spec
我们已经尝试将超时时间提高到5分钟，仍然是同样的错误。
这并不是一致的，每次运行测试都会通过。
考虑到这一点，我转向：在我们的设置中调试如下：
Capybara.register_driver :poltergeist do |app|
# use 'page.driver.debug' as a js debugger
# see https://github.com/jonleighton/poltergeist/tree/v1.5.0#remote-debugging-experimental
Capybara::Poltergeist::Driver.new(app, :timeout => 300, :inspector => true, :debug => false, :window_size => [1280, 1400], :js_errors => true)
end
并重新进行测试。失败的规范输出如下：
{"name"=>"current_url", "args"=>[]}
{"response"=>{"page_id"=>126, "ids"=>[0]}}
An error occurred in an after hook
URI::InvalidURIError: bad URI(is not URI?): {"page_id"=>126, "ids"=>[0]}
occurred at /home/rof/.rvm/rubies/ruby-1.9.3-p545/lib/ruby/1.9.1/uri/common.rb:176:in `split'
{"name"=>"current_url", "args"=>[]}
{"response"=>"http://127.0.0.1:49891/users/sign_up?m=borrower"}
{"name"=>"current_url", "args"=>[]}
{"response"=>"http://127.0.0.1:49891/users/sign_up?m=borrower"}
{"name"=>"body", "args"=>[]}
{"response"=>"http://127.0.0.1:49891/users/sign_up?m=borrower"}
我无法找到任何关于为什么调用current_url返回page_id哈希而不是URL的提示，但这实际上会破坏所有后续功能测试并导致find始终返回true：
{"name"=>"find", "args"=>["xpath","/html"]}
{"response"=>"true"}
在所有后续测试中导致此异常（无论是否标记为：js =＆gt;是否为真）：
Failure/Error: Unable to find matching line from backtrace
NoMethodError:
undefined method `[]' for true:TrueClass
# /home/rof/cache/bundler/ruby/1.9.1/gems/poltergeist-1.5.0/lib/capybara/poltergeist/browser.rb:54:in `find'
# /home/rof/cache/bundler/ruby/1.9.1/gems/poltergeist-1.5.0/lib/capybara/poltergeist/driver.rb:114:in `find'
# /home/rof/cache/bundler/ruby/1.9.1/gems/poltergeist-1.5.0/lib/capybara/poltergeist/driver.rb:118:in `find_xpath'
# /home/rof/cache/bundler/ruby/1.9.1/gems/capybara-2.2.1/lib/capybara/node/finders.rb:154:in `block in resolve_query'
# /home/rof/cache/bundler/ruby/1.9.1/gems/capybara-2.2.1/lib/capybara/node/base.rb:77:in `synchronize'
# /home/rof/cache/bundler/ruby/1.9.1/gems/capybara-2.2.1/lib/capybara/node/finders.rb:150:in `resolve_query'
# /home/rof/cache/bundler/ruby/1.9.1/gems/capybara-2.2.1/lib/capybara/node/finders.rb:129:in `all'
# /home/rof/cache/bundler/ruby/1.9.1/gems/capybara-2.2.1/lib/capybara/node/matchers.rb:107:in `block in assert_no_selector'
# /home/rof/cache/bundler/ruby/1.9.1/gems/capybara-2.2.1/lib/capybara/node/base.rb:81:in `synchronize'
# /home/rof/cache/bundler/ruby/1.9.1/gems/capybara-2.2.1/lib/capybara/node/matchers.rb:106:in `assert_no_selector'
# /home/rof/cache/bundler/ruby/1.9.1/gems/capybara-2.2.1/lib/capybara/session.rb:396:in `block (2 levels) in <class:Session>'
# /home/rof/cache/bundler/ruby/1.9.1/gems/capybara-2.2.1/lib/capybara/session.rb:81:in `reset!'
# /home/rof/cache/bundler/ruby/1.9.1/gems/capybara-2.2.1/lib/capybara.rb:253:in `block in reset_sessions!'
# /home/rof/cache/bundler/ruby/1.9.1/gems/capybara-2.2.1/lib/capybara.rb:253:in `each'
# /home/rof/cache/bundler/ruby/1.9.1/gems/capybara-2.2.1/lib/capybara.rb:253:in `reset_sessions!'
# /home/rof/cache/bundler/ruby/1.9.1/gems/capybara-2.2.1/lib/capybara/rspec.rb:20:in `block (2 levels) in <top (required)>'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:471:in `instance_eval'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:471:in `instance_eval_with_rescue'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:242:in `instance_eval_with_rescue'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/hooks.rb:31:in `run'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/hooks.rb:85:in `block in run'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/hooks.rb:85:in `each'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/hooks.rb:85:in `run'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/hooks.rb:446:in `run_hook'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:350:in `run_after_each_hooks'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:298:in `run_after_each'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:120:in `block in run'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-rails-2.14.0/lib/rspec/rails/example/controller_example_group.rb:158:in `call'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-rails-2.14.0/lib/rspec/rails/example/controller_example_group.rb:158:in `block (2 levels) in <module:ControllerExampleGroup>'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/extensions/instance_eval_with_args.rb:16:in `instance_exec'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/extensions/instance_eval_with_args.rb:16:in `instance_eval_with_args'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:247:in `instance_eval_with_args'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/hooks.rb:106:in `block (2 levels) in run'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/hooks.rb:104:in `call'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/hooks.rb:104:in `run'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/hooks.rb:446:in `run_hook'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:340:in `run_around_each_hooks'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:256:in `with_around_each_hooks'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/example.rb:111:in `run'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:390:in `block in run_examples'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:386:in `map'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:386:in `run_examples'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/example_group.rb:371:in `run'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:28:in `block (2 levels) in run'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:28:in `map'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:28:in `block in run'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/reporter.rb:58:in `report'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/command_line.rb:25:in `run'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/runner.rb:80:in `run'
# /home/rof/cache/bundler/ruby/1.9.1/gems/rspec-core-2.14.7/lib/rspec/core/runner.rb:17:in `block in autorun'
知道发生了什么事吗？