code: def test_decode_base64():
      assert decode_base64(data="abcde12") == b"i\xb7\x1d{]"
  
file_path: pyecharts/test/test_snapshot.py
imports: import os
  from unittest.mock import patch
  from nose.tools import assert_equal, raises
  from pyecharts.charts import Bar
  from pyecharts.render import make_snapshot
  from pyecharts.render.snapshot import save_as, save_as_png, save_as_text, decode_base64
label_desc: Use image node_id 2 for calling a global function with example usage: test_decode_base64() without return types