From 9a02d5aaebec6f860005c540111760bf355fbb7c Mon Sep 17 00:00:00 2001
From: Arthur <worldnomad@gmail.com>
Date: Tue, 19 Sep 2023 10:23:11 -0700
Subject: [PATCH] 13813 add test

---
 netbox/utilities/tests/test_counters.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/netbox/utilities/tests/test_counters.py b/netbox/utilities/tests/test_counters.py
index 0c61c0890..cf8850c52 100644
--- a/netbox/utilities/tests/test_counters.py
+++ b/netbox/utilities/tests/test_counters.py
@@ -36,10 +36,18 @@ class CountersTest(TestCase):
         self.assertEqual(device1.interface_count, 3)
         self.assertEqual(device2.interface_count, 3)
 
+        # test saving an existing object - counter should not change
         interface1.save()
         device1.refresh_from_db()
         self.assertEqual(device1.interface_count, 3)
 
+        # test save where tracked object FK back pointer is None
+        vc = VirtualChassis.objects.create(name='Virtual Chassis 1')
+        device1.virtual_chassis = vc
+        device1.save()
+        vc.refresh_from_db()
+        self.assertEqual(vc.member_count, 1)
+
     def test_interface_count_deletion(self):
         """
         When a tracked object (Interface) is deleted the tracking counter should be updated.