code: def test_msk_read_masks(path_rgb_msk_byte_tif):
      """Boundless read of a source with .msk succeeds
  
      Success in this case means that we read a mask that has
      invalid pixels around the edges, is appropriately padded,
      and has valid data pixels in the center.
      """
      with rasterio.open(path_rgb_msk_byte_tif) as src:
          msk = src.read_masks(
              1,
              boundless=True,
              window=Window(-200, -200, 1000, 1000),
              out_shape=((600, 600)),
          )
          # Invalid region is padded correctly.
          assert not msk[0:195, 0:195].any()
          # We have the valid data expected in the center.
          assert msk.mean() > 90
  
imports: import numpy
  import pytest
  import rasterio
  from rasterio.enums import Resampling
  from rasterio.windows import Window
label_desc: Use image node_id 15 for calling a global function with example usage: test_msk_read_masks(path_rgb_msk_byte_tif) without return types