RSpec2测试HAML助手

Question

我正在使用HAML助手来绘制菜单

module ApplicationHelper
  def draw_menu
    items = %w[
      item1
      item2
    ] # community

    capture_haml do
      haml_tag :nav, :class => "main-menu" do
        haml_tag :ul do
          items.each do |item|
            css_class = nil
            css_class = "first-item" unless item != items.first
            css_class = "last-item" unless item != items.last

            haml_tag :li, :class => css_class do
              haml_concat link_to t("nav.#{item}")
            end
          end
        end
      end

      haml_tag :div, :class => "clearize"
    end
  end
end

我正在尝试测试它(我想要匹配预期的输出为/<nav class='main-menu'>\s*<\/nav><div class='clearize'><\/div>/)

我实际上做的是

require "spec_helper"

describe ApplicationHelper do

  before(:all) do
    init_haml_helpers
  end

  it "should draw a menu" do
    draw_menu().should_not be_empty
  end

end

但是它不断地得到以下错误：

1) ApplicationHelper should draw a menu
   Failure/Error: draw_menu().should_not be_empty
   ActionController::RoutingError:
     No route matches {}
   # ./app/helpers/application_helper.rb:20:in `block (5 levels) in draw_menu'
   # ./app/helpers/application_helper.rb:19:in `block (4 levels) in draw_menu'
   # ./app/helpers/application_helper.rb:14:in `each'
   # ./app/helpers/application_helper.rb:14:in `block (3 levels) in draw_menu'
   # ./app/helpers/application_helper.rb:13:in `block (2 levels) in draw_menu'
   # ./app/helpers/application_helper.rb:12:in `block in draw_menu'
   # ./app/helpers/application_helper.rb:11:in `draw_menu'
   # ./spec/helpers/application_helper_spec.rb:10:in `block (2 levels) in <top (required)>'

为什么？我怎样才能使它像预期的那样工作呢？

谢谢!

Answer 1

如果您调用link_to只传递一个字符串作为该参数，那么该字符串将用作链接文本。链接的目标是由当前操作和控制器提供的：url_for (底层助手)只是将您给出的参数与构成当前操作的参数合并。这就是为什么

link_to 'something', :action => :an_action

生成一个指向呈现视图的控制器的an_action方法的链接。

在助手规范中，这个环境不存在:没有当前的操作或控制器，所以这是行不通的。