对于我的Rails 3.1应用程序上的Cucumber场景，我使用了@javascript标记，因此Selenium已激活。我收到以下错误：

Could not find Firefox binary (os=macosx). Make sure Firefox is installed or set the path manually with Selenium::WebDriver::Firefox::Binary.path= (Selenium::WebDriver::Error::WebDriverError)

如果可能的话，我想使用Google Chrome浏览器作为浏览器-而不是Firefox（我尚未安装）。这可能吗？该怎么办？

实际上，Cucumber / Selenium不应检测并使用浏览器吗？

====编辑====

添加后

Capybara.register_driver :selenium do |app|
  Capybara::Selenium::Driver.new(app, :browser => :chrome)
end

…到features / support / env.rb，我现在收到此错误：

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. (Selenium::WebDriver::Error::WebDriverError)
  ./features/step_definitions/web_steps.rb:45:in `/^(?:|I )am on (.+)$/'
  features/update_memories.feature:11:in `Given I am on the home page'

我是从这里下载的，并且尝试将chromedriver可执行文件放在/
usr / bin中，但是仍然出现上述错误。

====编辑2 ====

进一步执行以下步骤并运行“ sudo chmod + x / usr / bin / chromedriver”后，在运行黄瓜之后，我现在收到一个新错误：

@javascript
  Scenario: navigate to memory update page from home page              # features/update_memories.feature:11
    Given I am on the home page                                        # features/step_definitions/web_steps.rb:44
      unable to connect to chromedriver http://127.0.0.1:57870 (Selenium::WebDriver::Error::WebDriverError)
      ./features/step_definitions/web_steps.rb:45:in `/^(?:|I )am on (.+)$/'
      features/update_memories.feature:12:in `Given I am on the home page'
    When I activate the edit memory switch for the memory "I played"   # features/step_definitions/memories/memory_steps.rb:5
    Then I should be on the edit memory page for the memory "I played" # features/step_definitions/web_steps.rb:187
      PGError: server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
      : ROLLBACK (ActiveRecord::StatementInvalid)

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