Simplify tests teatDown method.

mayan/apps/permissions/tests/test_models.py

@@ -23,11 +23,6 @@ class PermissionTestCase(TestCase):
         self.role = Role.objects.create(label=TEST_ROLE_LABEL)
         Permission.invalidate_cache()
 
-    def tearDown(self):
-        self.role.delete()
-        self.group.delete()
-        self.user.delete()
-
     def test_no_permissions(self):
         with self.assertRaises(PermissionDenied):
             Permission.check_permissions(

mayan/apps/permissions/tests/test_views.py

@@ -28,9 +28,6 @@ class PermissionsViewsTestCase(TestCase):
         self.assertTrue(logged_in)
         self.assertTrue(self.admin_user.is_authenticated())
 
-    def tearDown(self):
-        self.admin_user.delete()
-
     def test_role_creation_view(self):
         response = self.client.post(
             reverse(