code: def testNormal(self):
      shape = [13, 34, 29]
      atol = 0.1
      outputs = extensions.normal(123, shape)
      self.assertAllClose(0, np.mean(outputs), atol=atol)
      self.assertAllClose(1, np.std(outputs), atol=atol)
  
imports: import functools
  import itertools
  from absl import flags
  from absl.testing import parameterized
  from jax import lax
  import numpy
  import tensorflow.compat.v2
  from trax.tf_numpy import extensions
  import trax.tf_numpy.numpy
label_desc: Use image node_id 29 for calling the ExtensionsTest obj's underlying member method code with example usage: obj.testNormal() without return types