code: def test_init(self, spatial_dims, size, expected):
      super().test_init(spatial_dims, size, expected)
  
imports: from __future__ import annotations
  import unittest
  import torch
  from parameterized import parameterized
  from monai.networks.layers import ApplyFilter, EllipticalFilter, LaplaceFilter, MeanFilter, SharpenFilter
label_desc: Use image node_id 2 for calling the MeanFilterTestCase obj's underlying member method code with example usage: obj.test_init(spatial_dims, size, expected) without return types