code: def test_zNormalize_zero_error(self):
      with pytest.raises(ValueError):
          zNormalize(np.array([2.0, 2.0, 2.0]))
  
imports: from matrixprofile.utils import *
  import numpy
  import pytest
label_desc: Use image node_id 1 for calling the TestClass obj's underlying member method code with example usage: obj.test_zNormalize_zero_error() without return types