code: def test_trigonometric(Chart, datas):
      """Test trigonometric interpolation"""
      chart = Chart(interpolate="trigonometric")
      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 5 for calling a global function with example usage: test_trigonometric(Chart, datas) without return types