code: def test_json_serialization(self):
      model = _get_model()
      json_string = model.to_json()
      new_model = model_from_json(json_string)
      self.assertEqual(json_string, new_model.to_json())
  
imports: import numpy
  import pytest
  from absl.testing import parameterized
  from keras import layers
  from keras import testing
  from keras.layers.core.input_layer import Input
  from keras.models.functional import Functional
  from keras.models.model import Model
  from keras.models.model import model_from_json
label_desc: Use image node_id 2 for calling the ModelTest obj's underlying member method code with example usage: obj.test_json_serialization() without return types