diff --git a/src/tests/cases/service/provider_test.py b/src/tests/cases/service/provider_test.py
index b158a483..96fef8eb 100644
--- a/src/tests/cases/service/provider_test.py
+++ b/src/tests/cases/service/provider_test.py
@@ -15,6 +15,7 @@ class ProviderTest(unittest.TestCase):
         self._configuration = self._app_host.configuration
         self._services = self._app_host.services
 
+        self._configuration.add_environment_variables('CPL_')
         self._configuration.add_argument_variables()
         self._configuration.add_json_file(f'appsettings.json')
         self._configuration.add_json_file(f'appsettings.{self._configuration.environment.environment_name}.json')
diff --git a/src/tests/cases/time/time_format_settings.py b/src/tests/cases/time/time_format_settings_test.py
similarity index 100%
rename from src/tests/cases/time/time_format_settings.py
rename to src/tests/cases/time/time_format_settings_test.py
diff --git a/src/tests/cases/utils/credential_manager.py b/src/tests/cases/utils/credential_manager_test.py
similarity index 100%
rename from src/tests/cases/utils/credential_manager.py
rename to src/tests/cases/utils/credential_manager_test.py
diff --git a/src/tests/tester.py b/src/tests/tester.py
index 98c1c68b..bc66330a 100644
--- a/src/tests/tester.py
+++ b/src/tests/tester.py
@@ -2,8 +2,8 @@ import unittest
 from typing import Type
 
 from tests.cases.service.provider_test import ProviderTest
-from tests.cases.time.time_format_settings import TimeFormatSettingsTest
-from tests.cases.utils.credential_manager import CredentialManagerTest
+from tests.cases.time.time_format_settings_test import TimeFormatSettingsTest
+from tests.cases.utils.credential_manager_test import CredentialManagerTest
 
 
 class Tester: