Functioning RSpec 2 spec for ActiveView helper

# Functioning RSpec 2 spec for ActiveView helper 

require 'spec_helper'
require 'action_view/template/handlers/erb'

module MyViewHelper
  def tab_for(clazz, &block)               
    content = with_output_buffer(&block)  
    content_tag :li, content, :class => clazz
  end
end

module MyOtherViewHelper
  def hello(clazz, &block)               
    content = with_output_buffer(&block)
    content_tag :div, content, :class => clazz
  end
end


class ActionViewTester
  include ActionView::Helpers::TagHelper  
  include ActionView::Helpers::CaptureHelper

  def initialize &block
    if block
      block.arity < 1 ? self.instance_eval(&block) : block.call(self)  
    end    
  end

  def with_output_buffer(buf = nil)
    yield
  end  
  
  def self.tests *helpers
    helpers.flatten.each do |name|
      include name.to_s.camelize.constantize
    end
  end  
end  

describe "do it" do
  it "works" do    
    ActionViewTester.tests MyViewHelper, MyOtherViewHelper
    ActionViewTester.new do |helper|            
      helper.tab_for('kristian') { 'hello' }.should match /kristian/
      helper.hello('david') { 'hello' }.should match /david/
    end
  end
end