code: def test_flatten_rank_one(self):
      self._core_flatten(batch_input_shape=[4])
  
file_path: tf-encrypted/tf_encrypted/keras/layers/flatten_test.py
imports: import unittest
  import numpy
  import pytest
  import tf_encrypted
  from tf_encrypted.keras.testing_utils import agreement_test
label_desc: Use image node_id 2 for calling the TestFlatten obj's underlying member method code with example usage: obj.test_flatten_rank_one() without return types