code: def hole_in_ones():
      """A 5x5 array with one nodata pixel dead center"""
      a = np.ones((5, 5), dtype="uint8")
      a[2][2] = 0
      return a
  
file_path: rasterio/tests/test_fillnodata.py
imports: import numpy
  import pytest
  from rasterio.fill import fillnodata
label_desc: Use image node_id 1 for calling a global function with example usage: hole_in_ones() and returns: a