new_contents: # -*- coding: utf-8 -*-
  #
  import numpy
  
  from helpers import compute_volume
  
  
  def test_volume():
      points = numpy.array([
          [0.0, 0.0, 0.0],
          [1.0, 0.0, 0.0],
          [2.0, 0.0, 0.0],
          [3.0, 0.0, 0.0],
          [3.0, 1.0, 0.0],
          [2.0, 1.0, 0.0],
          [1.0, 1.0, 0.0],
          [0.0, 1.0, 0.0],
          ])
      cells = {
          'triangle': numpy.array([
              [0, 1, 6],
              [0, 6, 7],
              ]),
          'quad': numpy.array([
              [1, 2, 5, 6],
              [2, 3, 4, 5],
              ])
          }
      vol = compute_volume(points, cells)
      assert abs(vol - 3.0) < 1.0e-14
      return
  
subject: add volume test