code: def setUp(self):
      bar0 = (
          Bar()
          .add_xaxis(["a", "b"])
          .add_yaxis("shop a", [1, 2])
          .add_yaxis("shop b", [3, 4])
          .set_global_opts(
              title_opts=opts.TitleOpts("test"),
              visualmap_opts=opts.VisualMapOpts(),
          )
      )
      self.tl = Timeline().add(bar0, "year 2015")
  
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 1 for calling the TestTimeLine obj's underlying member method code with example usage: obj.setUp() without return types