code: def test_zeros():
      assert roundness(np.zeros((10, 10))) == 0
      assert eccentricity(np.zeros((10, 10))) == 0
      I = np.zeros((16, 16))
      I[8:4:12] = 1
      assert eccentricity(I) == 0
  
file_path: mahotas/mahotas/tests/test_features_shape.py
imports: import mahotas.features.shape
  import numpy
  import mahotas
  from mahotas.features.shape import roundness, eccentricity
label_desc: Use image node_id 3 for calling a global function with example usage: test_zeros() without return types