code: def test_b4(self):
      self.assertEqual(self._b4.shape, (2, 3, 4))
  
      b4 = np.array(
          [
              [
                  [True, True, True, True],
                  [True, True, True, True],
                  [True, True, True, True],
              ],
              [
                  [True, True, True, True],
                  [True, True, True, True],
                  [True, True, True, True],
              ],
          ]
      )
  
      np.array_equal(self._b4, b4)
  
imports: import os
  import unittest
  import numpy
  import tensorflow
  import tensorlayer
  from tests.utils import CustomTestCase
label_desc: Use image node_id 6 for calling the Array_Op_Alphas_Test obj's underlying member method code with example usage: obj.test_b4() without return types