泊坞窗。未初始化的常量Watir ::浏览

Question

我试图在docker容器上以无头模式运行watir chrome驱动程序。红宝石在轨道上。

这是我的docker config：

# https://github.com/codelittinc/dockerfiles/blob/master/ruby/Dockerfile
FROM ruby:2.2

# Mount any shared volumes from host to container @ /share
ENV HOME /home/rails/webapp

# Install dependencies and rails-api
RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs xvfb chromium

WORKDIR $HOME

# Install gems
ADD Gemfile* $HOME/
RUN bundle install

ADD . $HOME

# Configure an entry point, so we don't need to specify
# "bundle exec" for each of our commands.
ENTRYPOINT ["bundle", "exec"]

CMD ["rails", "server", "--binding", "0.0.0.0"]

错误： 在浏览器初始化时出错：

?[33mapp_1       |?[0m NameError (uninitialized constant Watir::Browse):
?[33mapp_1       |?[0m
?[33mapp_1       |?[0m app/services/watir_test_service.rb:15:in `test_me'
?[33mapp_1       |?[0m app/controllers/watir_test_controller.rb:4:in `index'

类：

require 'rubygems'
require 'watir-webdriver'
require 'headless'

class Watir_test_service

  def test_me

    headless = Headless.new
    browser = Watir::Browse.new :chrome

    begin
      headless.start
      browser.goto "http://google.com"

      puts browser.title
    ensure
      browser.close
      headless.destroy
    end
  end
end

可能是什么原因？ xvfb，chromium安装在容器上。构建容器没有错误。