code: def test_distance():
      bw = np.ones((256, 256), bool)
      bw[100, 100] = 0
      compare_slow(bw)
  
      bw[100:110, 100:110] = 0
      compare_slow(bw)
  
      bw[200:210, 200:210] = 0
      compare_slow(bw)
  
file_path: mahotas/mahotas/tests/test_distance.py
imports: from mahotas import distance
  import numpy
label_desc: Use image node_id 4 for calling a global function with example usage: test_distance() without return types