code: def test_anisotropic_diffusion_three_channels():
      # Purpose of this test is to ensure the filter code does not crash
      # Depending on Python versions
      arr = np.random.uniform(size=(60, 31, 3))
      filtered = anisotropic_diffusion(arr)
      assert filtered.shape == arr.shape
  
file_path: medpy/tests/filter_/anisotropic_diffusion.py
imports: import unittest
  import scipy
  import numpy
  from medpy.filter import anisotropic_diffusion
label_desc: Use image node_id 4 for calling a global function with example usage: test_anisotropic_diffusion_three_channels() without return types