Add cache invalidation test case mixins

Add PermissionTestCaseMixin and SmartSettingTestCaseMixin
to better organize cache invalidation of both apps for
tests.

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

mayan/apps/common/tests/base.py

@@ -5,8 +5,8 @@ from django.test import TestCase
 from django_downloadview import assert_download_response
 
 from mayan.apps.acls.tests.mixins import ACLTestCaseMixin
-from mayan.apps.permissions.classes import Permission
-from mayan.apps.smart_settings.classes import Namespace
+from mayan.apps.permissions.tests.mixins import PermissionTestCaseMixin
+from mayan.apps.smart_settings.tests.mixins import SmartSettingsTestCaseMixin
 from mayan.apps.user_management.tests.mixins import UserTestMixin
 
 from .mixins import (
@@ -21,19 +21,15 @@ from .mixins import (
 class BaseTestCase(
     SilenceLoggerTestCaseMixin, ConnectionsCheckTestCaseMixin,
     RandomPrimaryKeyModelMonkeyPatchMixin, ACLTestCaseMixin,
-    ModelTestCaseMixin, OpenFileCheckTestCaseMixin,
-    TempfileCheckTestCasekMixin, UserTestMixin, TestCase
+    ModelTestCaseMixin, OpenFileCheckTestCaseMixin, PermissionTestCaseMixin,
+    SmartSettingsTestCaseMixin, TempfileCheckTestCasekMixin, UserTestMixin,
+    TestCase
 ):
     """
     This is the most basic test case class any test in the project should use.
     """
     assert_download_response = assert_download_response
 
-    def setUp(self):
-        super(BaseTestCase, self).setUp()
-        Namespace.invalidate_cache_all()
-        Permission.invalidate_cache()
-
 
 class GenericViewTestCase(
     ClientMethodsTestCaseMixin, ContentTypeCheckTestCaseMixin,