Dirty spec for a Rails helper using #url_for

gistfile1.rb

module ApplicationHelper
  def self_url(options = Hash.new)
    url_for(request.path_parameters.merge(options))
  end
end

describe ApplicationHelper do
  describe '#self_url' do
    def do_it(options = Hash.new)
      helper.self_url(options)
    end

    it "returns the url for the current request's path parameters" do
      @params = Hash.new
      @args = { :alpha => :beta }
      @request = mock(Object, :path_parameters => @params)

      @params.should_receive(:merge).with(@args).and_return(@params)
      helper.should_receive(:request).and_return(@request)
      helper.should_receive(:url_for).with(@params).and_return("URL")

      do_it(@args).should == "URL"
    end
  end
end