code: def test_gauage_radius_setting(fake_writer):
      c = Gauge().add("", [("完成率", 66.6)], radius="50%")
      c.render()
      _, content = fake_writer.call_args[0]
      assert_in("radius", content)
  
imports: from unittest.mock import patch
  from nose.tools import assert_equal, assert_in
  from pyecharts.charts import Gauge
  from pyecharts import options
label_desc: Use image node_id 3 for calling a global function with example usage: test_gauage_radius_setting(fake_writer) without return types