code: def test_mismatched_array_markers():
      S = np.zeros((10, 12), np.uint8)
      markers = np.zeros((8, 12), np.uint8)
      markers[2, 2] = 1
      markers[6, 2] = 2
      with pytest.raises(ValueError):
          mahotas.cwatershed(S, markers)
  
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 4 for calling a global function with example usage: test_mismatched_array_markers() without return types