[FIX] server_environment: test independent from the working env

server_environment/tests/test_environment_variable.py

@@ -1,7 +1,6 @@
 # Copyright 2018 Camptocamp (https://www.camptocamp.com).
 # License LGPL-3.0 or later (https://www.gnu.org/licenses/lgpl.html)
 
-
 from unittest.mock import patch
 
 from odoo.tools.config import config as odoo_config
@@ -10,10 +9,19 @@
 
 from .common import ServerEnvironmentCase
 
+CLEAN_ENV = {
+    var: value
+    for (var, value) in os.environ.items()
+    if var not in ("RUNNING_ENV", "ODOO_STAGE")
+}
+
 
 class TestRunningEnvDefault(ServerEnvironmentCase):
+    @patch.dict("os.environ", CLEAN_ENV, clear=True)
+    @patch.dict(odoo_config.options, {"running_env": None})
     def test_running_env_default(self):
         """When var is not provided it defaults to `test`."""
+        server_env._load_running_env()
         self.assertEqual(odoo_config["running_env"], "test")