code: def test_watershed2():
      S = np.zeros((100, 10), np.uint8)
      markers = np.zeros_like(S)
      markers[20, 2] = 1
      markers[80, 2] = 2
      W = mahotas.cwatershed(S, markers)
      assert np.all((W == 1) | (W == 2))
  
file_path: mahotas/mahotas/tests/test_watershed.py
imports: import numpy
  import mahotas
  import mahotas
  import sys
  import pytest
label_desc: Use image node_id 3 for calling a global function with example usage: test_watershed2() without return types