code: def test_tensorflow_session_function(self):
      sess_a = tf_utils.tensorflow_session()
      sess_b = tf_utils.tensorflow_session()
      self.assertIs(sess_a, sess_b)
  
      sess_b.close()
      sess_c = tf_utils.tensorflow_session()
      self.assertIsNot(sess_b, sess_c)
  
imports: import pytest
  import numpy
  import tensorflow
  from tensorflow.errors import FailedPreconditionError
  from neupy import init
  from neupy.utils import tf_utils, asfloat
  from base import BaseTestCase
label_desc: Use image node_id 10 for calling the TFUtilsTestCase obj's underlying member method code with example usage: obj.test_tensorflow_session_function() without return types