code: def test_checksum_band_window_quarter():
      """A quarter window's checksum is different from the full image's"""
      with rasterio.open("tests/data/RGB.byte.tif") as src:
          window = ((0, src.height // 2), (0, src.width // 2))
          checksums = [
              src.checksum(i, window=window) for i in src.indexes
          ]
          assert checksums != [25420, 29131, 37860]
  
file_path: rasterio/tests/test_checksum.py
imports: import rasterio
  from rasterio.windows import Window
label_desc: Use image node_id 4 for calling a global function with example usage: test_checksum_band_window_quarter() without return types