code: def test_logtarget_via_env_variable(dst=None):
      with patch.dict("os.environ", {"DATALADTEST_LOG_TARGET": dst}):
          ok_(not exists(dst))
          lgr = LoggerHelper("dataladtest-2").get_initialized_logger()
          ok_(not exists(dst))
      # just to see that mocking patch worked
      ok_("DATALADTEST_LOG_TARGET" not in os.environ)
  
imports: import inspect
  import logging
  import os.path
  from logging import makeLogRecord
  from os.path import exists
  from unittest.mock import patch
  from datalad import cfg
  from datalad.log import ColorFormatter, LoggerHelper, TraceBack, log_progress, with_progress, with_result_progress
  from datalad.support import ansi_colors
  from datalad.support.constraints import EnsureBool
  from datalad.tests.utils_pytest import SkipTest, assert_equal, assert_in, assert_no_open_files, assert_not_in, assert_re_in, known_failure_githubci_win, ok_, ok_endswith, ok_generator, swallow_logs, with_tempfile
  from datalad.utils import on_windows
label_desc: Use image node_id 2 for calling a global function with example usage: test_logtarget_via_env_variable(dst) without return types