Ruby + Watir

Watir でChromeを自動操作したいのだが

$ gem install watir-webdriver

Fetching: json_pure-1.6.1.gem (100%)

Fetching: rubyzip-0.9.4.gem (100%)

Fetching: ffi-1.0.9.gem (100%)

Building native extensions. This could take a while...

Fetching: childprocess-0.2.2.gem (100%)

Fetching: selenium-webdriver-2.7.0.gem (100%)

Fetching: watir-webdriver-0.3.4.gem (100%)

Successfully installed json_pure-1.6.1

Successfully installed rubyzip-0.9.4

Successfully installed ffi-1.0.9

Successfully installed childprocess-0.2.2

Successfully installed selenium-webdriver-2.7.0

Successfully installed watir-webdriver-0.3.4

6 gems installed

Installing ri documentation for json_pure-1.6.1...

Installing ri documentation for rubyzip-0.9.4...

Installing ri documentation for ffi-1.0.9...

Installing ri documentation for childprocess-0.2.2...

Installing ri documentation for selenium-webdriver-2.7.0...

Installing ri documentation for watir-webdriver-0.3.4...

Installing RDoc documentation for json_pure-1.6.1...

Installing RDoc documentation for rubyzip-0.9.4...

Installing RDoc documentation for ffi-1.0.9...

Installing RDoc documentation for childprocess-0.2.2...

Installing RDoc documentation for selenium-webdriver-2.7.0...

Installing RDoc documentation for watir-webdriver-0.3.4...

$ irb

ruby-1.9.2-p290 :001 > require 'watir-webdriver'

=> true

ruby-1.9.2-p290 :002 > browser = Watir::Browser.new(:chrome)

Selenium::WebDriver::Error::WebDriverError: Unable to find the chromedriver executable. Please download the server from http://code.google.com/p/chromium/downloads/list and place it somewhere on your PATH. More info at http://code.google.com/p/selenium/wiki/ChromeDriver.

from /home/nakamura/.rvm/gems/ruby-1.9.2-p290/gems/selenium-webdriver-2.7.0/lib/selenium/webdriver/chrome/service.rb:18:in `executable_path'

from /home/nakamura/.rvm/gems/ruby-1.9.2-p290/gems/selenium-webdriver-2.7.0/lib/selenium/webdriver/chrome/service.rb:28:in `default_service'

from /home/nakamura/.rvm/gems/ruby-1.9.2-p290/gems/selenium-webdriver-2.7.0/lib/selenium/webdriver/chrome/bridge.rb:12:in `initialize'

from /home/nakamura/.rvm/gems/ruby-1.9.2-p290/gems/selenium-webdriver-2.7.0/lib/selenium/webdriver/common/driver.rb:35:in `new'

from /home/nakamura/.rvm/gems/ruby-1.9.2-p290/gems/selenium-webdriver-2.7.0/lib/selenium/webdriver/common/driver.rb:35:in `for'

from /home/nakamura/.rvm/gems/ruby-1.9.2-p290/gems/selenium-webdriver-2.7.0/lib/selenium/webdriver.rb:81:in `for'

from /home/nakamura/.rvm/gems/ruby-1.9.2-p290/gems/watir-webdriver-0.3.4/lib/watir-webdriver/browser.rb:35:in `initialize'

from (irb):2:in `new'

from (irb):2

from /home/nakamura/.rvm/rubies/ruby-1.9.2-p290/bin/irb:16:in `

'

ruby-1.9.2-p290 :003 >