code: def _GetNumberOfFiles(self, path):
      print("xxx", path)
      print(fileio.listdir(path))
      return len(fileio.listdir(path))
  
imports: import json
  import os
  import tensorflow
  from tfx.components.pusher import executor
  from tfx.dsl.io import fileio
  from tfx.types import standard_artifacts
  from tfx.types import standard_component_specs
  from tfx.utils import io_utils
  from tfx.utils import path_utils
label_desc: Use image node_id 4 for calling the ExecutorTest obj's underlying member method code with example usage: obj._GetNumberOfFiles(path) and returns: len