code: def test_invalid_encode_exception(self):
      with self.assertRaises(TypeError):
          _json.dumps({"a": {1}}, cls=utils.PlotlyJSONEncoder)
  
imports: import datetime
  import math
  import decimal
  from datetime import datetime
  from unittest import TestCase
  from time import time
  import pytest
  import numpy
  import pandas
  import pytz
  from pandas.testing import assert_series_equal
  import json
  import os
  import base64
  from plotly import optional_imports, utils
  import plotly.graph_objects
  from plotly.graph_objs import Scatter, Scatter3d, Figure, Data
  from plotly.utils import get_by_path
  from PIL import Image
label_desc: Use image node_id 22 for calling the TestJSONEncoder obj's underlying member method code with example usage: obj.test_invalid_encode_exception() without return types