code: def image_skeleton():
      data = numpy.zeros((9, 9), dtype=numpy.float32)
  
      data[4, :] = 1.0
  
      data[:, 4] = 1.0
  
      return data
  
file_path: CellProfiler/tests/frontend/modules/test_measureimageskeleton.py
imports: import numpy
  import pytest
  import cellprofiler_core.measurement
  from cellprofiler_core.constants.measurement import COLTYPE_INTEGER
  import cellprofiler.modules.measureimageskeleton
label_desc: Use image node_id 1 for calling a global function with example usage: image_skeleton() and returns: data