class_docstr: Test basic functionality of the central config object.
docstr: Check that the default temporary directory is writable.
docstr_tok: ["Check","that","the","default","temporary","directory","is","writable","."]
code: def test_tmp_dir_is_writable(self):
      """Check that the default temporary directory is writable."""
      import satpy
  
      assert _is_writable(satpy.config["tmp_dir"])
  
imports: from __future__ import annotations
  import contextlib
  import os
  import sys
  import unittest
  from importlib.metadata import EntryPoint
  from pathlib import Path
  from typing import Callable, Iterator
  from unittest import mock
  import pytest
  import satpy
  from satpy import DatasetDict
  from satpy._config import cached_entry_point
  from satpy.composites.config_loader import load_compositor_configs_for_sensors
label_desc: Use image node_id 6 for calling the TestConfigObject obj's underlying member method code with example usage: obj.test_tmp_dir_is_writable() without return types