code: def test_quadratic(Chart, datas):
      """Test quadratic interpolation"""
      chart = Chart(interpolate="quadratic")
      chart = make_data(chart, datas)
      assert chart.render()
  
file_path: pygal/pygal/test/test_interpolate.py
imports: from pygal.test import make_data
label_desc: Use image node_id 3 for calling a global function with example usage: test_quadratic(Chart, datas) without return types