snippet.rb

require "rubygems"
require "webrat"
require 'spec'
include Webrat::Matchers

output = "
  <h1>Hallo Welt<h1>
  <p>lorem</p>
  <a name='demo' />
"
puts "test a"
output.should have_selector("a", :name => "demo")
# => no output, no error

puts "test h1"                                                 
output.should have_selector("h1", :class => "main")
# =>expectation error