code: def test_uint8():
      # This used to raise an exception in 0.7.1
      f = np.arange(64 * 4).reshape((16, -1))
      median_filter(f.astype(np.uint8), np.ones((5, 5)))
  
file_path: mahotas/mahotas/tests/test_median_filter.py
imports: import numpy
  from mahotas.convolve import median_filter, rank_filter
  import pytest
label_desc: Use image node_id 4 for calling a global function with example usage: test_uint8() without return types