code: def test_statefullness_two_states_stack(self):
      sequence = np.arange(24).reshape((2, 3, 4)).astype("float32")
      layer = layers.RNN(
          [TwoStatesRNNCell(3), TwoStatesRNNCell(2)], stateful=True
      )
      layer(sequence)
      output = layer(sequence)
      self.assertAllClose(
          np.array([[136368.0, 136368.0], [692784.0, 692784.0]]), output
      )
  
file_path: keras/keras/layers/rnn/stacked_rnn_cells_test.py
imports: import numpy
  import pytest
  from keras import layers
  from keras import testing
  from keras.layers.rnn.rnn_test import OneStateRNNCell
  from keras.layers.rnn.rnn_test import TwoStatesRNNCell
label_desc: Use image node_id 5 for calling the StackedRNNTest obj's underlying member method code with example usage: obj.test_statefullness_two_states_stack() without return types