gistfile1.rb

module ApplicationHelper
  def self_url(options = {})
    url_for(request.path_parameters.merge(options))
  end
end
 
describe ApplicationHelper do
  describe '#self_url' do
    before(:each) do
      # using params we can easily detect a reverse merge with
      @params = { :merged => false, :from_params => true }
      @args = { :merged => true, :from_args => true }
      @merged_params = @params.merge(@args)
      @request = mock(Object, :path_parameters => @params)
      helper.should_receive(:request).and_return(@request)
    end

    it "should return the url for the new params merged with the old params" do
      helper.self_url(@args).should == url_for(@merged_params)
    end
  end
end