code: def test_gtiff_profile_nodata():
      assert DefaultGTiffProfile()["nodata"] == 0
  
imports: import pickle
  import pytest
  import rasterio
  from rasterio.profiles import Profile, DefaultGTiffProfile
  from rasterio.profiles import default_gtiff_profile
label_desc: Use image node_id 8 for calling a global function with example usage: test_gtiff_profile_nodata() without return types