code: def test_cubic_prec(Chart, datas):
      """Test cubic interpolation precision"""
      chart = Chart(interpolate="cubic", interpolation_precision=200)
      chart = make_data(chart, datas)
  
      chart_low = Chart(interpolate="cubic", interpolation_precision=5)
      chart_low = make_data(chart, datas)
  
      assert len(chart.render()) >= len(chart_low.render())
  
file_path: pygal/pygal/test/test_interpolate.py
imports: from pygal.test import make_data
label_desc: Use image node_id 2 for calling a global function with example usage: test_cubic_prec(Chart, datas) without return types