# File lib/Borges/TestCase/HtmlRendererTest.rb, line 24
  def render
    str = ''
    rc = Borges::RenderingContext.new(HtmlDocument.new,
                                      @url, CallbackStore.new)
    yield ::Borges::HtmlRenderer.new(rc)
    rc.document.print_html_on str
    return str
  end