code: def test_opener_io_open():
      """Use io.open as opener."""
      with rasterio.open(
          "tests/data/RGB.byte.tif", opener=io.open
      ) as src:
          profile = src.profile
          assert profile["driver"] == "GTiff"
          assert profile["count"] == 3
  
file_path: rasterio/tests/test_pyopener.py
imports: import zipfile
  import io
  import fsspec
  import numpy
  import pytest
  import rasterio
  from rasterio.enums import MaskFlags
  from rasterio.errors import RasterioIOError, OpenerRegistrationError
label_desc: Use image node_id 3 for calling a global function with example usage: test_opener_io_open() without return types