code: def test_custom_label(self):
      custom_label_opts = {"custom": "label"}
      self.tl.add_schema(label_opts=custom_label_opts)
      assert_equal(
          custom_label_opts,
          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 3 for calling the TestTimeLine obj's underlying member method code with example usage: obj.test_custom_label() without return types