code: def test_get_data_dir__from_env_var__proj_lib(tmp_path):
      with proj_env(), patch.dict(
          os.environ, {"PROJ_LIB": str(tmp_path)}, clear=True
      ), patch(
          "pyproj.datadir.Path.absolute", return_value=_INVALID_PATH
      ), patch(
          "pyproj.datadir.sys.prefix", str(_INVALID_PATH)
      ):
          create_projdb(tmp_path)
          assert get_data_dir() == str(tmp_path)
  
imports: import logging
  import os
  from contextlib import contextmanager
  from pathlib import Path
  from unittest.mock import patch
  import pytest
  import pyproj._datadir
  from pyproj import CRS, Transformer, get_codes, set_use_global_context
  from pyproj._datadir import _pyproj_global_context_initialize
  from pyproj.datadir import DataDirError, append_data_dir, get_data_dir, get_user_data_dir, set_data_dir
  from pyproj.enums import PJType
  from pyproj.exceptions import CRSError
  from test.conftest import proj_env
label_desc: Use image node_id 8 for calling a global function with example usage: test_get_data_dir__from_env_var__proj_lib(tmp_path) without return types