Add user test mixin to base test class

Allow tests to create test users.

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

mayan/apps/common/tests/base.py

@@ -7,6 +7,7 @@ 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.user_management.tests.mixins import UserTestMixin
 
 from .mixins import (
     ClientMethodsTestCaseMixin, ConnectionsCheckTestCaseMixin,
@@ -21,7 +22,7 @@ class BaseTestCase(
     SilenceLoggerTestCaseMixin, ConnectionsCheckTestCaseMixin,
     RandomPrimaryKeyModelMonkeyPatchMixin, ACLTestCaseMixin,
     ModelTestCaseMixin, OpenFileCheckTestCaseMixin,
-    TempfileCheckTestCasekMixin, TestCase
+    TempfileCheckTestCasekMixin, UserTestMixin, TestCase
 ):
     """
     This is the most basic test case class any test in the project should use.