code: def test_encode_as_datetime_with_localized_tz(self):
      # should convert tzinfo to utc. Note that in october, we're in EDT!
      # therefore the 4 hour difference is correct.
      naive_datetime = datetime.datetime(2013, 10, 1)
      aware_datetime = pytz.timezone("US/Eastern").localize(
          naive_datetime
      )
  
      res = utils.PlotlyJSONEncoder.encode_as_datetime(aware_datetime)
      self.assertEqual(res, "2013-10-01T00:00:00-04:00")
  
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 7 for calling the TestJSONEncoder obj's underlying member method code with example usage: obj.test_encode_as_datetime_with_localized_tz() without return types