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我有一台自动构建机器在 EC2 实例上运行黄瓜测试。我在用：

  • 水豚 (1.1.4)
  • 硒网络驱动程序（2.31.0）
  • chromedriver (25.0.1364.172-187217)

测试是使用 Xvfb X11 Server (1.7.7-29.10.amzn1) 无头运行的。这个设置已经运行了好几个月，但上周停止在这些机器上运行。

我得到的错误是：

(::) failed steps (::)

end of file reached (EOFError)
/mnt/bamboo-ebs/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/protocol.rb:135:in `read_nonblock'
/mnt/bamboo-ebs/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/protocol.rb:135:in `rbuf_fill'
/mnt/bamboo-ebs/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/protocol.rb:116:in `readuntil'
/mnt/bamboo-ebs/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/protocol.rb:126:in `readline'
/mnt/bamboo-ebs/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/http.rb:2219:in `read_status_line'
/mnt/bamboo-ebs/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/http.rb:2208:in `read_new'
/mnt/bamboo-ebs/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/http.rb:1191:in `transport_request'
/mnt/bamboo-ebs/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/http.rb:1177:in `request'
/mnt/bamboo-ebs/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/http.rb:1170:in `block in request'
/mnt/bamboo-ebs/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/http.rb:627:in `start'
/mnt/bamboo-ebs/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/net/http.rb:1168:in `request'
./features/step_definitions/web_steps.rb:49:in `/^(?:|I )go to (.+)$/'

我最好的猜测是问题是由于过去一个月对 selenium 或 chromedriver 库的升级，因为每当启动构建实例时这些库都会更新。

我检查了 chromedriver 日志，但它们似乎没有提供任何帮助：

0.000][INFO]:      ChromeDriver 23.0.1240.0 /mnt/bamboo-ebs/bin/chromedriver/chromedriver
[0.259][FINE]:      Initializing session with capabilities {
   "browserName": "chrome",
   "chrome.detach": true,
   "chromeOptions": {
      "detach": true
   },
   "cssSelectorsEnabled": true,
   "javascriptEnabled": true,
   "nativeEvents": false,
   "platform": "ANY",
   "rotatable": false,
   "takesScreenshot": false,
   "version": ""
}

[0.259][INFO]:      Using named testing interface
[0.676][INFO]:      Connected to Chrome successfully. Version: 25.0.1364.172
[0.693][FINE]:      Command received (/session/132be881788b1e7a6c878f4c45935176)
[0.693][FINE]:      Command finished (/session/132be881788b1e7a6c878f4c45935176) with response {
   "sessionId": "132be881788b1e7a6c878f4c45935176",
   "status": 0,
   "value": {
      "acceptSslCerts": false,
      "applicationCacheEnabled": false,
      "browserConnectionEnabled": false,
      "browserName": "chrome",
      "chrome.chromedriverVersion": "23.0.1240.0",
      "chrome.nativeEvents": false,
      "cssSelectorsEnabled": true,
      "databaseEnabled": false,
      "handlesAlerts": true,
      "javascriptEnabled": true,
      "locationContextEnabled": false,
      "nativeEvents": true,
      "platform": "linux",
      "rotatable": false,
      "takesScreenshot": true,
      "version": "25.0.1364.172",
      "webStorageEnabled": true
   }
}

[0.695][FINE]:      Command received (/session/132be881788b1e7a6c878f4c45935176/url) with params {
   "url": "http://127.0.0.1:31337/"
}

[0.695][FINER]:     Waiting for all views to stop loading...
[0.696][FINER]:     Done waiting for all views to stop loading
[0.716][FINER]:     Waiting for all views to stop loading...

所有测试都在我的开发机器（Mac OSX Mountain Lion）上使用 chromedriver（26.0.1383.0）成功运行。我试图降级我的 chromedriver 以匹配我的构建机器上的版本，但发现我无法做到这一点。

我已经设法使用 firefox 运行测试，但这对我们来说不是一个长期的解决方案。

任何帮助将非常感激。

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