code: def test_anisotropic_diffusion_powerof2_single_channel():
      arr = np.random.uniform(size=(64, 64))
      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 1 for calling a global function with example usage: test_anisotropic_diffusion_powerof2_single_channel() without return types