code: def test_bar_colors(fake_writer):
      c = (
          Bar()
          .add_xaxis(["A", "B", "C"])
          .add_yaxis("series0", [1, 2, 4])
      )
      c.set_colors(["#AABBCC", "#BBCCDD", "#CCDDEE"] + c.colors)
      c.render()
      _, content = fake_writer.call_args[0]
      assert_in("#AABBCC", content)
      assert_in("#BBCCDD", content)
      assert_in("#CCDDEE", content)
  
imports: import re
  import sys
  from io import StringIO
  from test import stdout_redirect
  from unittest.mock import patch
  from nose.tools import assert_equal, assert_greater, assert_in, assert_not_in
  from pyecharts import options
  from pyecharts.charts import Bar
  from pyecharts.commons.utils import JsCode
  from pyecharts.globals import CurrentConfig, NotebookType, ThemeType
  from pyecharts.render.display import HTML
label_desc: Use image node_id 6 for calling a global function with example usage: test_bar_colors(fake_writer) without return types