Sinatra sings the helper stubbing blues

helper-stubbing-blues.rb

require 'sinatra/base'
require 'rack/test'

class MyApp < Sinatra::Base
  disable :show_exceptions
  helpers do
    def msg
      "hello world"
    end
  end

  get '/' do
    msg
  end
end

describe "sinatra helpers" do
  include Rack::Test::Methods
  def app; MyApp.new end

  it "fails to stub" do
    app.stub(:msg) { 'goodbye world' }
    get "/"
    last_response.body.should == 'goodbye world'
  end
  
  it "fails to stub miserably" do
    MyApp.any_instance.stub(:msg).and_return { 'goodbye world' }
    get "/"
    last_response.body.should == 'goodbye world'
  end
end