Testing ajax call with watir

gistfile1.rb

wait { browser.div(:id, 'id').text.should include 'Some Message' }

def wait(&block)
  begin
    Timeout::timeout(15) do
      while not block_successful?(&block)
        sleep 0.5
      end
    end
  rescue Timeout::Error
    raise @exception
  end
end

def block_successful?
  begin
    return yield
  rescue => e
    @exception = e
    return false
  end
end