old_contents: from simulocloud import PointCloud
  import json
  import numpy as np
  
  _TEST_XYZ = """[[10.0, 12.2, 14.4, 16.6, 18.8],
                  [11.1, 13.3, 15.5, 17.7, 19.9],
                  [0.1, 2.1, 4.5, 6.7, 8.9]]"""
  
  _EXPECTED_POINTS = np.array([( 10. ,  11.1,  0.1),
                               ( 12.2,  13.3,  2.1),
                               ( 14.4,  15.5,  4.5),
                               ( 16.6,  17.7,  6.7),
                               ( 18.8,  19.9,  8.9)], 
                              dtype=[('x', '<f8'), ('y', '<f8'), ('z', '<f8')])
  
  def test_PointCloud_from_lists():
      """ Can PointCloud initialisable directly from `[[xs], [ys], [zs]]` ?"""
      assert np.all(PointCloud(json.loads(_TEST_XYZ)).points == _EXPECTED_POINTS)
  
new_contents: from simulocloud import PointCloud
  import json
  import numpy as np
  
  _TEST_XYZ = [[10.0, 12.2, 14.4, 16.6, 18.8],
               [11.1, 13.3, 15.5, 17.7, 19.9],
                [0.1, 2.1, 4.5, 6.7, 8.9]]
  
  _EXPECTED_POINTS = np.array([( 10. ,  11.1,  0.1),
                               ( 12.2,  13.3,  2.1),
                               ( 14.4,  15.5,  4.5),
                               ( 16.6,  17.7,  6.7),
                               ( 18.8,  19.9,  8.9)], 
                              dtype=[('x', '<f8'), ('y', '<f8'), ('z', '<f8')])
  
  def test_PointCloud_from_lists():
      """ Can PointCloud initialisable directly from `[[xs], [ys], [zs]]` ?"""
      assert np.all(PointCloud(_TEST_XYZ).points == _EXPECTED_POINTS)
  
subject: Write test data as list unless otherwise needed