code: def test_zNormalize(self):
      outcome = np.array([-1.0, 1.0, 1.0, -1.0])
      assert np.allclose(
          zNormalize(np.array([0.0, 1.0, 1.0, 0.0])), outcome
      )
  
imports: from matrixprofile.utils import *
  import numpy
  import pytest
label_desc: Use image node_id 2 for calling the TestClass obj's underlying member method code with example usage: obj.test_zNormalize() without return types