code: def test_forward(self):
      test_filter = self.filter_class(spatial_dims=2, size=3)
      input = torch.ones(1, 1, 5, 5)
      _ = test_filter(input)
  
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 _TestFilter obj's underlying member method code with example usage: obj.test_forward() without return types