code: def test_protos_exist(self) -> None:
      # The proto classes should exist
      _ = onnx.AttributeProto
      _ = onnx.NodeProto
      _ = onnx.GraphProto
      _ = onnx.ModelProto
  
imports: import io
  import os
  import pathlib
  import tempfile
  import unittest
  import google.protobuf.message
  import google.protobuf.text_format
  import parameterized
  import onnx
  from onnx import serialization
label_desc: Use image node_id 1 for calling the TestBasicFunctions obj's underlying member method code with example usage: obj.test_protos_exist() without return types