code: def _gen_faker_engine(content: str):
      class Engine:
          def __init__(self, content):
              self.content = content
  
          def make_snapshot(self, *args, **kwargs):
              return self.content
  
      return Engine(content)
  
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 1 for calling a global function with example usage: _gen_faker_engine(content) and returns: Engine, self