gistfile1.rb

require 'rubygems'
require 'capybara-webkit'

counter = 0
app = proc do |env|
  counter += 1
  [200, { 'Content-Type' => 'text/html' }, [counter.to_s]]
end

session = Capybara::Session.new(:webkit, app)

loop do
  sleep 2
  session.visit('/')
  if session.find('body').text == counter.to_s
    print '.'
  else
    puts "\n#{session.find('body').text} != #{counter}"
    break
  end
end