Net :: ReadTimeout:Net :: ReadTimeout和Selenium :: WebDriver :: Error :: UnknownError:未知错误:Chrome无法启动Rails 5.1.beta系统测试

热衷于将Capybara烘焙到新版本的Rails(5.1)cf http://weblog.rubyonrails.org/2017/2/23/Rails-5-1-beta1/

我遇到了一个问题。 这是我的步骤。 任何线索欢迎。

全新安装:

  • Linux Ubuntu Desktop 16.10(Hyper-V上的VM),Chrome安装并运行正常;
  • Ruby 2.4;
  • Rails 5.1.beta。

1.-创建一个简单的应用程序:

~$ 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.-运行测试

  ~/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(安装chromedriver )中的建议进行chromedriver

  ~/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$ 

好的。 重试测试……

  ~/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$ 

不好!

在app dir中运行rails -v时给出了‘Net :: ReadTimeout:Net :: ReadTimeout’错误消息的根本原因的线索,给出了Selenium :: WebDriver :: Error :: UnknownError:未知错误:Chrome未能开始

  ~/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 ' Error: PostsTest#test_visiting_the_index: Net::ReadTimeout: Net::ReadTimeout bin/rails test test/system/posts_test.rb:4 ... ~/railsapps/smoketestapp$ 

这是我直接从Ruby调用Selenium WebDriver时得到的:

  ~/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 `' 2.4.0 :003 > exit ~/railsapps/smoketestapp$ 

感谢任何帮助,谢谢

瓦鲁斯

更新:

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

  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) 

拖尾日志文件钉它:chrome不会启动:

  ~/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),尽管直接在VM上(在终端服务器中)做同样的工作

在PuTTY上:

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

然而,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,但这是另一个故事:

  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) => # 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 `' irb(main):005:0> exit 

最后,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 Ubuntu,通过PuTTY远程访问)。

我找到了一种让它发挥作用的方法。

为此,我放弃了Chrome及其Selenium驱动程序,用于PhantomJS和恶作剧。

PhantomJS是一个无头浏览器(=无GUI)。 它很棒。 这是我的步骤(Rails 5.1):

  1. 将gem’thterterist’添加到你的Gemfile中,并注释掉gem’selenium-webdriver’(我们不会使用chrome需要的后者):

     #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 ),注释掉chrome驱动程序配置:

     $ cat test/application_system_test_case.rb require "test_helper" require "capybara/poltergeist" Capybara.javascript_driver = :poltergeist class ApplicationSystemTestCase < ActionDispatch::SystemTestCase # driven_by :selenium, using: :chrome, screen_size: [1400, 1400] driven_by :poltergeist end 
  4. 下载'PhamtomJS'无头浏览器,并将其放在PATH中的目录中:

     $ wget https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-1.9.8-linux-x86_64.tar.bz2 $ tar -xjvf phantomjs-1.9.8-linux-x86_64.tar.bz2 $ sudo cp phantomjs-1.9.8-linux-x86_64/bin/phantomjs /usr/local/bin $ sudo chmod +x /usr/local/bin/phantomjs 
  5. 你已经准备好了,并准备好进行系统测试。 例如:

     $ rake test TEST=test/system/posts_test.rb Run options: --seed 38196 # Running: Puma starting in single mode... * Version 3.8.2 (ruby 2.4.0-p0), codename: Sassy Salamander * Min threads: 0, max threads: 1 * Environment: test * Listening on tcp://0.0.0.0:44265 Use Ctrl-C to stop You're running an old version of PhantomJS, update to >= 2.1.1 for a better experience. . Finished in 1.366478s, 0.7318 runs/s, 0.7318 assertions/s. 1 runs, 1 assertions, 0 failures, 0 errors, 0 skips $