code: def test_no_dot():
      """Line test with an empty serie"""
      line = Line()
      line.add("no dot", [])
      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 4 for calling a global function with example usage: test_no_dot() without return types