code: def test_sparkline(Chart, datas):
      """Test sparkline"""
      chart = Chart()
      chart = make_data(chart, datas)
      assert chart.render_sparkline()
  
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 23 for calling a global function with example usage: test_sparkline(Chart, datas) without return types