code: def test_one_dot():
      """Line test with an unique value"""
      line = Line()
      line.add("one dot", [12])
      line.x_labels = ["one"]
      q = line.render_pyquery()
      assert len(q(".axis.x")) == 1
      assert len(q(".axis.y")) == 1
      assert len(q(".y.axis .guides")) == 1
  
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 3 for calling a global function with example usage: test_one_dot() without return types