我想用Selenium和Ruby。我正在使用Ubuntu 15.10
首先，我已经安装了selenium-webdriver gem。
现在我尝试执行示例代码：
require "selenium-webdriver"
driver = Selenium::WebDriver.for :firefox
driver.navigate.to "http://google.com"
element = driver.find_element(:name, 'q')
element.send_keys "Hello WebDriver!"
element.submit
puts driver.title
driver.quit
当我这样做时，我收到此错误：
/home/my_user/.rbenv/versions/2.2.3/lib/ruby/2.2.0/net/protocol.rb:153:in `read_nonblock': end of file reached (EOFError)
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/2.2.0/net/protocol.rb:153:in `rbuf_fill'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/2.2.0/net/protocol.rb:134:in `readuntil'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/2.2.0/net/protocol.rb:144:in `readline'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/2.2.0/net/http/response.rb:39:in `read_status_line'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/2.2.0/net/http/response.rb:28:in `read_new'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/2.2.0/net/http.rb:1414:in `block in transport_request'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/2.2.0/net/http.rb:1411:in `catch'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/2.2.0/net/http.rb:1411:in `transport_request'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/2.2.0/net/http.rb:1384:in `request'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/2.2.0/net/http.rb:1377:in `block in request'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/2.2.0/net/http.rb:853:in `start'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/2.2.0/net/http.rb:1375:in `request'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/remote/http/default.rb:107:in `response_for'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/remote/http/default.rb:58:in `request'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/remote/http/common.rb:59:in `call'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/remote/bridge.rb:649:in `raw_execute'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/remote/bridge.rb:627:in `execute'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/remote/bridge.rb:134:in `get'
from /home/my_user/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/selenium-webdriver-2.53.4/lib/selenium/webdriver/common/navigation.rb:33:in `to'
执行时，会立即打开并关闭Firefox窗口（driver.quit之前）。