code: def test_no_dot_at_all():
      """Line test with no value"""
      q = Line().render_pyquery()
      assert q(".text-overlay text").text() == "No data"
  
file_path: pygal/pygal/test/test_line.py
imports: from __future__ import division
  from math import cos, sin
  from pygal import Line
  from pygal.test.utils import texts
label_desc: Use image node_id 5 for calling a global function with example usage: test_no_dot_at_all() without return types