selenium-webdriver - selenium-webdriver を使用して CEF3 アプリケーションを自動化する方法

Question

selenium-webdriver を使用して CefSharp (CEF3) ベースのアプリケーションを自動化していますが、エラーが発生し続けました。

次の Ruby スクリプトを使用して、CEF アプリケーションを起動します。

require "selenium-webdriver"
cefpath = 'C:\mypathto\cefapp.exe'
Selenium::WebDriver::Chrome.path = cefpath
browser = Selenium::WebDriver.for :chrome
......

実行すると、CEF アプリケーション (Chrome のコンテナー) が開きますが、次のエラーでスタックします。

C:/Ruby200/lib/ruby/2.0.0/net/protocol.rb:158:in `rescue in rbuf_fill': Net::ReadTimeout (Net::ReadTimeout)
        from C:/Ruby200/lib/ruby/2.0.0/net/protocol.rb:152:in `rbuf_fill'
        from C:/Ruby200/lib/ruby/2.0.0/net/protocol.rb:134:in `readuntil'
        from C:/Ruby200/lib/ruby/2.0.0/net/protocol.rb:144:in `readline'
        from C:/Ruby200/lib/ruby/2.0.0/net/http/response.rb:39:in `read_status_line'
        from C:/Ruby200/lib/ruby/2.0.0/net/http/response.rb:28:in `read_new'
        from C:/Ruby200/lib/ruby/2.0.0/net/http.rb:1406:in `block in transport_request'
        from C:/Ruby200/lib/ruby/2.0.0/net/http.rb:1403:in `catch'
        from C:/Ruby200/lib/ruby/2.0.0/net/http.rb:1403:in `transport_request'
        from C:/Ruby200/lib/ruby/2.0.0/net/http.rb:1376:in `request'
        from C:/Ruby200/lib/ruby/2.0.0/net/http.rb:1369:in `block in request'
        from C:/Ruby200/lib/ruby/2.0.0/net/http.rb:852:in `start'
        from C:/Ruby200/lib/ruby/2.0.0/net/http.rb:1367:in `request'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/remote/http/default.rb:83:in `response_for'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/remote/http/default.rb:39:in `request'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/remote/http/common.rb:40:in `call'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/remote/bridge.rb:634:in `raw_execute'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/remote/bridge.rb:99:in `create_session'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/remote/bridge.rb:68:in `initialize'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/chrome/bridge.rb:29:in `initialize'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/common/driver.rb:37:in `new'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver/common/driver.rb:37:in `for'
        from C:/Ruby200/lib/ruby/gems/2.0.0/gems/selenium-webdriver-2.42.0/lib/selenium/webdriver.rb:67:in `for'

理由はありますか？

どうもありがとう。