code: def test_multi_render(Chart, datas):
      """Check that a chart always render the same"""
      chart = Chart()
      chart = make_data(chart, datas)
      svg = chart.render()
      for i in range(2):
          assert svg == chart.render()
  
imports: import io
  import os
  import uuid
  import pytest
  import pygal
  from pygal.graph.map import BaseMap
  from pygal.test import make_data
  from pygal.util import cut
label_desc: Use image node_id 1 for calling a global function with example usage: test_multi_render(Chart, datas) without return types