code: def test_env_file_saver(tmpdir):
      saver = EnvFileSaver("test_user", str(tmpdir))
      saver.save("name", "password")
      saver.save("name2", "password2")
      assert saver.load("name") == "password"
      saver.delete("name")
      assert saver.load("name") is None
      assert saver.load("name2") == "password2"
  
imports: from unittest import mock
  from llm_studio.app_utils.config import default_cfg
  from llm_studio.app_utils.setting_utils import EnvFileSaver, KeyRingSaver, NoSaver, Secrets, load_default_user_settings
label_desc: Use image node_id 3 for calling a global function with example usage: test_env_file_saver(tmpdir) without return types