code: def test_default_label(self):
      assert_equal(
          None,
          self.tl.options.get("baseOption")
          .get("timeline")
          .get("label"),
      )
  
file_path: pyecharts/test/test_timeline.py
imports: import unittest
  from nose.tools import assert_equal
  from pyecharts import options
  from pyecharts.charts import Bar, Timeline
  from pyecharts.commons.utils import JsCode
  from pyecharts.faker import Faker
label_desc: Use image node_id 2 for calling the TestTimeLine obj's underlying member method code with example usage: obj.test_default_label() without return types