def METHOD_NAME(rgb_byte_tif_reader):
    """Reading entirely outside the dataset returns the fill value"""
    with rgb_byte_tif_reader as src:
        data = src.read(window=Window(-200, -200, 100, 100), boundless=True,
                        fill_value=1)
        assert data.shape == (3, 100, 100)
        assert (data == 1).all()