code: def test_shifted_sparktext():
      """Test relative_to option in sparktext"""
      chart = Line()
      chart.add("_", list(map(lambda x: x + 10000, range(8))))
      assert chart.render_sparktext() == "▁▂▃▄▅▆▇█"
      assert chart.render_sparktext(relative_to=0) == "▇▇▇▇▇▇▇█"
  
file_path: pygal/pygal/test/test_sparktext.py
imports: from pygal import Bar, Line
label_desc: Use image node_id 3 for calling a global function with example usage: test_shifted_sparktext() without return types