code: def test_Opener():
      # Test default mode is 'rb'
      fobj = Opener(__file__)
      assert fobj.mode == "rb"
      fobj.close()
      # That it's a context manager
      with Opener(__file__) as fobj:
          assert fobj.mode == "rb"
      # That we can set the mode
      with Opener(__file__, "r") as fobj:
          assert fobj.mode == "r"
      # with keyword arguments
      with Opener(__file__, mode="r") as fobj:
          assert fobj.mode == "r"
      # fileobj returns fileobj passed through
      message = b"Wine?  Wouldn't you?"
      for obj in (BytesIO(message), Lunk(message)):
          with Opener(obj) as fobj:
              assert fobj.read() == message
          # Which does not close the object
          assert not obj.closed
          # mode is gently ignored
          fobj = Opener(obj, mode="r")
  
imports: import contextlib
  import hashlib
  import os
  import time
  import unittest
  from gzip import GzipFile
  from io import BytesIO, UnsupportedOperation
  from unittest import mock
  import pytest
  from packaging.version import Version
  from ..deprecator import ExpiredDeprecationError
  from ..openers import HAVE_INDEXED_GZIP, BZ2File, DeterministicGzipFile, ImageOpener, Opener
  from ..optpkg import optional_package
  from ..tmpdirs import InTemporaryDirectory
label_desc: Use image node_id 1 for calling a global function with example usage: test_Opener() without return types