Index: pydantic_settings-2.3.4/tests/test_settings.py
===================================================================
--- pydantic_settings-2.3.4.orig/tests/test_settings.py
+++ pydantic_settings-2.3.4/tests/test_settings.py
@@ -10,6 +10,7 @@ from datetime import datetime, timezone
 from enum import IntEnum
 from pathlib import Path
 from typing import Any, Callable, Dict, Generic, Hashable, List, Optional, Set, Tuple, Type, TypeVar, Union
+from unittest import mock
 
 import pytest
 import typing_extensions
@@ -1116,7 +1117,8 @@ def test_multiple_env_file(tmp_path):
 
         model_config = SettingsConfigDict(env_file=[base_env, prod_env])
 
-    s = Settings()
+    with mock.patch.dict('os.environ', {}, clear=True):
+        s = Settings()
     assert s.debug_mode is False
     assert s.host == 'https://example.com/services'
     assert s.port == 8000
@@ -1135,7 +1137,8 @@ def test_model_env_file_override_model_c
 
         model_config = SettingsConfigDict(env_file=prod_env)
 
-    s = Settings(_env_file=base_env)
+    with mock.patch.dict('os.environ', {}, clear=True):
+        s = Settings(_env_file=base_env)
     assert s.debug_mode is True
     assert s.host == 'localhost'
     assert s.port == 8000