code: def test_mesh_to_normal(self):
      mesh_transform = MeshToNormal()
      data = mesh_transform(self.data)
      normals = data.normals.numpy()
      npt.assert_array_equal(normals[0], [0, 0, 1])
      npt.assert_array_equal(normals[1], [-1, 0, 0])
  
file_path: torch-points3d/test/test_normal.py
imports: import os
  import unittest
  import numpy
  import numpy.testing
  import torch
  from torch_geometric.data import Data
  from torch_points3d.core.data_transform.transforms import MeshToNormal
label_desc: Use image node_id 2 for calling the TestModelUtils obj's underlying member method code with example usage: obj.test_mesh_to_normal() without return types