# File test/gruff_test_case.rb, line 67
  def graph_sized(filename, sizes=['', 400])
    class_name = self.class.name.gsub(/^TestGruff/, '')
    Array(sizes).each do |size|
      g = instance_eval("Gruff::#{class_name}.new #{size}")
      g.title = "#{class_name} Graph"
      yield g      
      write_test_file g, "#{filename}_#{size}.png"
    end
  end