code: def test_gtiff_profile_blockxsize():
      assert DefaultGTiffProfile()["blockxsize"] == 256
  
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 5 for calling a global function with example usage: test_gtiff_profile_blockxsize() without return types