Question

我想要在dockerized Selenium Grid中执行一系列测试。测试是使用RSpec和Capybara用Ruby编写的。另外值得注意的是：我使用dinghy作为docker-machine的包装器。

几周前，我建造了proof of concept，但是使用Nightwatch而不是RSpec + Capybara。这很好但是让Capybara与码头化的Selenium Grid一起工作已经证明是困难的。

我尝试了很多配置而没有成功。我认为最接近成功配置的是以下......

# docker-compose.yml

web:
  image: web:latest  # built on my machine
  environment:
    VIRTUAL_HOST: app.under.test

rspec:
  build: .
  dockerfile: Dockerfile
  environment:
    APP_HOST: app.under.test
  volumes:
    - .:/usr/src/app
  links:
    - web
    - hub

hub:
  image: selenium/hub:latest
  environment:
    VIRTUAL_HOST: selenium.hub.docker
  ports:
    - 4444:4444

node-firefox:
  image: selenium/node-firefox:latest
  environment:
    VIRTUAL_HOST: firefox.docker
  links:
    - hub

node-chrome:
  image: selenium/node-chrome:latest
  environment:
    VIRTUAL_HOST: chrome.docker
  links:
    - hub

# Dockerfile for the rspec image

FROM instructure/ruby-passenger:2.3

USER root

ENV APP_HOME /usr/src/app
RUN mkdir -p $APP_HOME
WORKDIR $APP_HOME

COPY Gemfile Gemfile.lock $APP_HOME/
RUN chown -R docker:docker $APP_HOME

USER docker
RUN bundle install --quiet --jobs 8
USER root

COPY . $APP_HOME
RUN chown -R docker:docker $APP_HOME

USER docker

# spec/example_test.rb:

require 'rspec'
require 'capybara'
require 'capybara/dsl'
require 'selenium-webdriver'

RSpec.configure do |config|
  config.include Capybara::DSL
end

def setup
  url = 'http://selenium.hub.docker'
  capabilities = Selenium::WebDriver::Remote::Capabilities.firefox
  Capybara.app_host = ENV['APP_HOST']

  Capybara.register_driver :remote_browser do |app|
    Capybara::Selenium::Driver.new(
      app,
      :browser => :remote,
      url: url,
      desired_capabilities: capabilities
    )
  end

  Capybara.default_driver = :remote_browser
  Capybara.javascript_driver = :remote_browser
end

describe 'This is an example' do
  it 'and it works' do
    setup
    visit '/'
    expect(page.title).to eq 'Home'
  end
end

但是这个^配置在开始测试时会产生以下错误：

1) This is an example and it works
     Failure/Error: visit '/'

 Selenium::WebDriver::Error::WebDriverError:
   unexpected response, code=200, content-type="text/html"
   <html><head><title>Selenium Grid2.0 help</title></head><body>You are using grid 2.52.0<br>Find help on the official selenium wiki : <a href='https://github.com/SeleniumHQ/selenium/wiki/Grid2' >more help here</a><br>default monitoring page : <a href='/grid/console' >console</a></body></html>
 # /home/docker/.gem/ruby/2.3.0/gems/selenium-webdriver-2.52.0/lib/selenium/webdriver/remote/http/common.rb:85:in `create_response'
 # /home/docker/.gem/ruby/2.3.0/gems/selenium-webdriver-2.52.0/lib/selenium/webdriver/remote/http/default.rb:90:in `request'
 # /home/docker/.gem/ruby/2.3.0/gems/selenium-webdriver-2.52.0/lib/selenium/webdriver/remote/http/common.rb:59:in `call'
 # /home/docker/.gem/ruby/2.3.0/gems/selenium-webdriver-2.52.0/lib/selenium/webdriver/remote/bridge.rb:645:in `raw_execute'
 # /home/docker/.gem/ruby/2.3.0/gems/selenium-webdriver-2.52.0/lib/selenium/webdriver/remote/bridge.rb:123:in `create_session'
 # /home/docker/.gem/ruby/2.3.0/gems/selenium-webdriver-2.52.0/lib/selenium/webdriver/remote/bridge.rb:87:in `initialize'
 # /home/docker/.gem/ruby/2.3.0/gems/selenium-webdriver-2.52.0/lib/selenium/webdriver/common/driver.rb:59:in `new'
 # /home/docker/.gem/ruby/2.3.0/gems/selenium-webdriver-2.52.0/lib/selenium/webdriver/common/driver.rb:59:in `for'
 # /home/docker/.gem/ruby/2.3.0/gems/selenium-webdriver-2.52.0/lib/selenium/webdriver.rb:86:in `for'
 # /home/docker/.gem/ruby/2.3.0/gems/capybara-2.6.2/lib/capybara/selenium/driver.rb:13:in `browser'
 # /home/docker/.gem/ruby/2.3.0/gems/capybara-2.6.2/lib/capybara/selenium/driver.rb:45:in `visit'
 # /home/docker/.gem/ruby/2.3.0/gems/capybara-2.6.2/lib/capybara/session.rb:232:in `visit'
 # /home/docker/.gem/ruby/2.3.0/gems/capybara-2.6.2/lib/capybara/dsl.rb:51:in `block (2 levels) in <module:DSL>'
 # ./spec/example_test.rb:31:in `block (2 levels) in <top (required)>'

有什么想法吗？我错过了什么？

更新

知道了！

def setup
  url = 'http://selenium.hub.docker/wd/hub'
  capabilities = Selenium::WebDriver::Remote::Capabilities.firefox
  Capybara.app_host = "http://#{ENV['APP_HOST']}"
  Capybara.run_server = false

  Capybara.register_driver :remote_browser do |app|
    Capybara::Selenium::Driver.new(
      app,
      :browser => :remote,
      url: url,
      desired_capabilities: capabilities
    )
  end

  Capybara.default_driver = :remote_browser
  Capybara.javascript_driver = :remote_browser
end

除了Capybara.run_server = false以及http://前置于app_host之外，关键是在网址上指定/wd/hub。

工作解决方案here。

Answer 1

对于水豚设置，您需要担心一些事情 -

1 - capybara连接到浏览器 - 在大多数人的情况下本地但你使用遥控器并且你似乎已正确配置

2 - 浏览器尝试连接的位置 - 其基本URL由Capybara.app_host设置 - 所以Capybara.app_host =＆＃34; http://<ip/domain名称应用程序将在＆gt;上运行 - 你已经设置为ENV [＆＃39; APP_HOST＆＃39;]设置为app.under.test - 我假设这个解析为机器上的可访问接口的ip /域名是capybara正在运行？

3 - Capybara绑定正在测试的应用程序 - 这是通过Capybara.server_host和Capybara.server_port设置的 - server_host默认为127.0.0.1并且随机选择端口。这很可能是您的问题所在，因为运行Capybara的计算机上的127.0.0.1通常无法从其他计算机访问您需要将其更改为与＃2的app.under.test匹配的外部可用IP 。如果防火墙配置需要，您可能还需要设置端口。

如何配置Capybara在dockerized Selenium Grid中运行测试？

更新

1 个答案: