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社区首页 >问答首页 >Net::ReadTimeout: Net::ReadTimeout和Selenium::WebDriver:: error：:UnknownError:未知错误: Chrome未能在Rails 5.1.beta系统测试上启动

问Net::ReadTimeout: Net::ReadTimeout和Selenium::WebDriver:: error：:UnknownError:未知错误: Chrome未能在Rails 5.1.beta系统测试上启动
EN

Stack Overflow用户
提问于 2017-03-19 20:21:54
回答 1查看 3.4K关注 0票数 4

热衷于将凯巴拉烘焙成新版本的Rails (5.1) cf http://weblog.rubyonrails.org/2017/2/23/Rails-5-1-beta1/

不过，我遇到了一个问题。这是我的舞步。任何线索都欢迎。

全新安装：

  • 16.10 (虚拟机在Hyper-V上)，安装了Chrome并运行良好；
  • 红宝石2.4；
  • Rails 5.1.beta

1.-创建一个简单的应用程序：

代码语言：javascript
复制
    ~$ ruby -v
    ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux]
    ~$ rails -v
    Rails 5.1.0.beta1
    ~$ mkdir railsapps
    ~$ cd railsapps
    ~/railsapps$ rails new smoketestapp
    ~/railsapps$ cd smoketestapp
    ~/railsapps/smoketestapp$ rails generate scaffold post title:string body:text
    ~/railsapps/smoketestapp$ rails db:migrate

2.-进行测试

代码语言：javascript
复制
    ~/railsapps/smoketestapp$ cat test/system/posts_test.rb
    require "application_system_test_case"

    class PostsTest < ApplicationSystemTestCase
      test "visiting the index" do
        visit posts_url

        assert_selector "h1", text: "Post"
      end
    end

     ~/railsapps/smoketestapp$ rake test TEST=test/system/posts_test.rb
    Run options: --seed 55778

    # Running:
    ...
    Error:
    PostsTest#test_visiting_the_index:
    Selenium::WebDriver::Error::WebDriverError: Unable to find chromedriver. Please download the server from http://chromedriver.storage.googleapis.com/index.html and place it somewhere on your PATH. More info at https://github.com/SeleniumHQ/selenium/wiki/ChromeDriver.
    ...
    1 runs, 0 assertions, 0 failures, 1 errors, 0 skips
     ~/railsapps/smoketestapp$

3.-好的，让我们按照错误消息中的建议进行(安装chromedriver)：

代码语言：javascript
复制
     ~/railsapps/smoketestapp$ ls /usr/bin/google-chrome
    lrwxrwxrwx 1 root root 31 Mar 18 15:31 /usr/bin/google-chrome -> /etc/alternatives/google-chrome*
     ~/railsapps/smoketestapp$ echo $PATH 
    ...:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:...
     ~/railsapps/smoketestapp$ wget https://chromedriver.storage.googleapis.com/2.28/chromedriver_linux64.zip
     ~/railsapps/smoketestapp$ unzip chromedriver_linux64.zip
     ~/railsapps/smoketestapp$ sudo cp chromedriver /usr/local/bin
     ~/railsapps/smoketestapp$ ls /usr/local/bin
    total 7504
    drwxr-xr-x  2 root root    4096 Mar 19 19:05 ./
    drwxr-xr-x 10 root root    4096 Okt 12 22:42 ../
    -rwxr-xr-x  1 root root 7673176 Mar 19 19:05 chromedriver*
     ~/railsapps/smoketestapp$

4。-好的。重试测试..。

代码语言：javascript
复制
     ~/railsapps/smoketestapp$ rake test TEST=test/system/posts_test.rb
    Run options: --seed 51574

    # Running:
    ...
    Error:
    PostsTest#test_visiting_the_index:
    Net::ReadTimeout: Net::ReadTimeout test/system/posts _test.rb:5:in `block in '
    ...
    bin/rails test test/system/posts_test.rb:4
    ...
    1 runs, 0 assertions, 0 failures, 1 errors, 0 skips
     ~/railsapps/smoketestapp$

不太好！

关于'Net::ReadTimeout: Net::ReadTimeout‘错误消息在应用程序dir中运行rails -v时给出了一个线索，给出了Selenium：：WebDriver：：error：：Un知情的错误:未知错误: Chrome未能启动

代码语言：javascript
复制
    ~/railsapps/smoketestapp$ rails -v
    Run options: --seed 39896
    # Running:
    .......E
    Error:
    PostsTest#test_visiting_the_index:
    Selenium::WebDriver::Error::UnknownError: unknown error: Chrome failed to start: exited abnormally
      (Driver info: chromedriver=2.28.455506  (18f6627e265f442aeec9b6661a49fe819aeeea1f),platform=Linux 4.8.0-41-generic x86_64)
        test/system/posts_test.rb:5:in `block in <class:PostsTest>'
    Error:
    PostsTest#test_visiting_the_index:
    Net::ReadTimeout: Net::ReadTimeout

    bin/rails test test/system/posts_test.rb:4
    ...
    ~/railsapps/smoketestapp$

这就是我从Ruby直接调用Selenium WebDriver时得到的结果：

代码语言：javascript
复制
    ~/railsapps/smoketestapp$ irb
    2.4.0 :001 > require "selenium-webdriver"
     => true
    2.4.0 :002 > driver = Selenium::WebDriver.for(:chrome)
    Net::ReadTimeout: Net::ReadTimeout
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/protocol.rb:176:in `rbuf_fill'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/protocol.rb:154:in `readuntil'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/protocol.rb:164:in `readline'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http/response.rb:40:in `read_status_line'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http/response.rb:29:in `read_new'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http.rb:1446:in `block in transport_request'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http.rb:1443:in `catch'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http.rb:1443:in `transport_request'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http.rb:1416:in `request'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http.rb:1409:in `block in request'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http.rb:877:in `start'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http.rb:1407:in `request'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/http/default.rb:124:in `response_for'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/http/default.rb:78:in `request'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/http/common.rb:61:in `call'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/bridge.rb:669:in `raw_execute'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/bridge.rb:108:in `create_session'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/bridge.rb:71:in `initialize'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/chrome/bridge.rb:52:in `initialize'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/common/driver.rb:61:in `new'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/common/driver.rb:61:in `for'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver.rb:87:in `for'
    from (irb):2
    from ~/.rvm/rubies/ruby-2.4.0/bin/irb:11:in `<main>'
    2.4.0 :003 > exit
    ~/railsapps/smoketestapp$

感谢你的帮助，谢谢

内卢斯

更新：

发现问题，查看Selenium驱动程序的日志文件。为此，我在IRB中输入了以下内容：

代码语言：javascript
复制
    require "selenium-webdriver"
    Selenium::WebDriver::Chrome.driver_path="/usr/local/bin/chromedriver"
    Selenium::WebDriver.for :chrome, :service_log_path => "/tmp/cd.log"
    driver = Selenium::WebDriver.for(:chrome)

跟踪日志文件锁定了它: chrome不会启动：

代码语言：javascript
复制
    ~/railsapps/smoketestapp$ tail /tmp/cd.log
       ...
    [0.247][INFO]: Launching chrome: /opt/google/chrome/google-chrome --disable-background-networking --disable-client-side-phishing-detection --disable-component-update --disable-default-apps --disable-hang-monitor --disable-prompt-on-repost --disable-web-resources --enable-logging --full-memory-crash-report --ignore-certificate-errors --load-extension=/tmp/.org.chromium.Chromium.Pdre6o/internal --logging-level=1 --metrics-recording-only --no-first-run --password-store=basic --remote-debugging-port=12264 --safebrowsing-disable-auto-update --safebrowsing-disable-download-protection --use-mock-keychain --user-data-dir=/tmp/.org.chromium.Chromium.mHJaEd data:,
    [0.250][WARNING]: PAC support disabled because there is no system implementation
    [20.281][INFO]: RESPONSE InitSession unknown error: Chrome failed to start: exited abnormally
    ~/railsapps/smoketestapp$

最后，我发现通过PuTTY远程调用chrome不起作用(这就是我一直在做的事情)，尽管在VM (终端服务器中)上直接执行同样的操作可以工作。

在PuTTY上：

代码语言：javascript
复制
    ~$ google-chrome
    [3938:3938:0320/213941.129923:ERROR:browser_main_loop.cc(279)] Gtk: cannot open display:

然而，它直接在VM上工作。

不幸的是，我的幸福是短暂的，因为我遇到了另一个错误，但那是另一个故事：

代码语言：javascript
复制
            irb(main):001:0> require "selenium-webdriver"
    => true
    irb(main):002:0> Selenium::WebDriver::Chrome.driver_path="/usr/local/bin/chromedriver"
    => "/usr/local/bin/chromedriver"
    irb(main):003:0> driver = Selenium::WebDriver.for(:chrome)
    => #<Selenium::WebDriver::Driver:0x59d7c889a916c6b8 browser=:chrome>
    irb(main):004:0> driver.navigate.to("http://www.google.com")
    Selenium::WebDriver::Error::UnknownError: unknown error: Runtime.executionContextCreated has invalid 'context': {"auxData":{"frameId":"10797.1","isDefault":true},"id":1,"name":"","origin":"://"}
      (Session info: chrome=57.0.2987.110)
      (Driver info: chromedriver=2.4.226074,platform=Linux 4.8.0-41-generic x86_64)
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/response.rb:69:in `assert_ok'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/response.rb:32:in `initialize'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/http/common.rb:83:in `new'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/http/common.rb:83:in `create_response'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/http/default.rb:107:in `request'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/http/common.rb:61:in `call'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/bridge.rb:669:in `raw_execute'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/bridge.rb:647:in `execute'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/bridge.rb:120:in `get'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/common/navigation.rb:32:in `to'
            from (irb):4
            from ~/.rvm/rubies/ruby-2.4.0/bin/irb:11:in `<main>'
    irb(main):005:0> exit
poltergeist
ruby-on-rails
selenium-webdriver
phantomjs
capybara
EN

回答 1

Stack Overflow用户

发布于 2017-03-26 18:45:07

最终，我想用Capybara运行系统测试，这些测试可以在我的设置中运行(开发机器= VM，OS = Linux，通过PuTTY远程访问)。

我找到了办法让它起作用。

为此，我放弃了Chrome及其硒驱动程序，用于PhantomJS和poltergeist。

PhantomJS是一个无头浏览器。效果很好。下面是我的步骤(Rails 5.1)：

  1. 将gem 'poltergeist‘添加到您的Gemfile中，并注释掉gem 'selenium-webdriver’( chrome需要后者，我们将不使用后者)： #gem 'selenium-webdriver‘gem 'poltergeist’
  2. 运行bundle update
  3. 添加poltergeist驱动程序配置(在文件application_system_test_case.rb中)，注释掉铬驱动程序配置： $ cat test/application_system_test_cat.cat要求"test_helper“要求"capybara/poltergeist”Capybara.javascript_driver = :poltergeist class ApplicationSystemTestCase
  4. 下载“PhamtomJS”无头浏览器，并将其放在路径中的一个目录中： $ wget 64.tar.bz2 $ tar -xjvf幻影usr 1.9.8-linux-x86_64.tar.bz2$ sudo cp幻影usr 1.9.8-linux-x86_64/bin/幻影/usr/local/bin $ sudo chmod +x /usr/local/bin/chmod
  5. 您已经做好了准备，准备运行系统测试。例如： $ rake = test /system/post_test.rb运行选项：-seed 38196 #运行: Puma以单模式启动.*版本3.8.2 (ruby2.4.0-P0)，代码名称: Salamander * Min线程: 0，最大线程:1* Environment: test *侦听tcp://0.0.0.0:44265使用Ctrl停止运行旧版本的PhantomJS，更新到>= 2.1.1以获得更好的体验。。在1.366478 s、0.7318次运行/s、0.7318次断言/s.1次运行、1次断言、0次失败、0次错误、0次跳过$中完成
票数 0
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/42891801

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