code: def test_timeline_graphic(self):
      self.tl.add_schema(
          graphic_opts=[
              opts.GraphicGroup(
                  graphic_item=opts.GraphicItem(
                      rotation=JsCode("Math.PI / 4"),
                      bounding="raw",
                      right=110,
                      bottom=110,
                      z=100,
                  ),
                  children=[
                      opts.GraphicRect(
                          graphic_item=opts.GraphicItem(
                              left="center", top="center", z=100
                          ),
                          graphic_shape_opts=opts.GraphicShapeOpts(
                              width=400, height=50
                          ),
                          graphic_basicstyle_opts=opts.GraphicBasicStyleOpts(
                              fill="rgba(0,0,0,0.3)"
                          ),
                      ),
                      opts.GraphicText(
                          graphic_item=opts.GraphicItem(
                              left="center", top="center", z=100
                          ),
                          graphic_textstyle_opts=opts.GraphicTextStyleOpts(
                              text="pyecharts bar chart",
                              font="bold 26px Microsoft YaHei",
                              graphic_basicstyle_opts=opts.GraphicBasicStyleOpts(
                                  fill="#fff"
                              ),
                          ),
                      ),
                  ],
              )
          ]
      )
      assert_equal(
          type(opts.GraphicGroup()),
          type(
              self.tl.options.get("baseOption")
              .get("timeline")
              .get("graphic")[0]
          ),
      )
  
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 8 for calling the TestTimeLine obj's underlying member method code with example usage: obj.test_timeline_graphic() without return types