code: def save_test_images(images):
      """Save all images as  PNG and NetCDF files
  
      Parameters
      ----------
      images: dict
        A dictionary mapping test case names to xarray images.
      """
      for description, img in images.items():
          save_to_image(img, description)
          save_to_netcdf(img, description)
  
imports: import os
  import xarray
  import datashader
  import pandas
  import numpy
  import pytest
label_desc: Use image node_id 16 for calling a global function with example usage: save_test_images(images) without return types