code: def test_boundless_fill_value():
      """Confirm resolution of issue #1471"""
      with rasterio.open("tests/data/red.tif") as src:
          filled = src.read(
              1,
              boundless=True,
              fill_value=5,
              window=Window(-1, -1, 66, 66),
          )
      assert (filled[:, 0] == 5).all()
      assert (filled[:, -1] == 5).all()
      assert (filled[0, :] == 5).all()
      assert (filled[-1, :] == 5).all()
  
imports: from affine import Affine
  import shutil
  from hypothesis import example, given
  import hypothesis.strategies
  import numpy
  from numpy.testing import assert_almost_equal
  import pytest
  import rasterio
  from rasterio.io import MemoryFile
  from rasterio.windows import Window
label_desc: Use image node_id 7 for calling a global function with example usage: test_boundless_fill_value() without return types