new_contents: # Licensed under an MIT open source license - see LICENSE
  from __future__ import print_function, absolute_import, division
  
  import pytest
  import warnings
  
  from ..statistics import Mahalanobis, Mahalanobis_Distance
  from ..statistics.stats_warnings import TurbuStatTestingWarning
  from ._testing_data import dataset1
  
  
  def test_Mahalanobis_raisewarning():
      '''
      Mahalanobis has not been completed yet. Ensure the warning is returned
      when used.
      '''
  
      with warnings.catch_warnings(record=True) as w:
          mahala = Mahalanobis(dataset1['cube'])
  
      assert len(w) == 1
      assert w[0].category == TurbuStatTestingWarning
      assert str(w[0].message) == \
          ("Mahalanobis is an untested statistic. Its use"
           " is not yet recommended.")
  
  
  def test_Mahalanobis_Distance_raisewarning():
      '''
      Mahalanobis has not been completed yet. Ensure the warning is returned
      when used.
      '''
  
      with warnings.catch_warnings(record=True) as w:
          mahala = Mahalanobis_Distance(dataset1['cube'], dataset1['cube'])
  
      # Warning is raised each time Mahalanobis is run (so twice)
      assert len(w) == 3
      assert w[0].category == TurbuStatTestingWarning
      assert str(w[0].message) == \
          ("Mahalanobis_Distance is an untested metric. Its use"
           " is not yet recommended.")
  
subject: Add mahalanobis tests to check that the warning is raised