code: def test_negative_and_float__sparktext():
      """Test negative values"""
      """Test negative values"""
      chart = Line()
      chart.add("_", [0.1, 0.2, 0.9, -0.5])
      assert chart.render_sparktext() == "▁▂█▁"
  
file_path: pygal/pygal/test/test_sparktext.py
imports: from pygal import Bar, Line
label_desc: Use image node_id 5 for calling a global function with example usage: test_negative_and_float__sparktext() without return types