From 1d6594161b1a4f6069b5204b87376eb3663414a8 Mon Sep 17 00:00:00 2001
From: Andrii Landiak <andriylandiak@gmail.com>
Date: Wed, 25 Mar 2026 15:28:28 +0200
Subject: [PATCH] fix: force getLhServer() failure in LwM2m listener
 preservation test

---
 .../lwm2m/server/LwM2mServerCertificateReloadTest.java         | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/common/transport/lwm2m/src/test/java/org/thingsboard/server/transport/lwm2m/server/LwM2mServerCertificateReloadTest.java b/common/transport/lwm2m/src/test/java/org/thingsboard/server/transport/lwm2m/server/LwM2mServerCertificateReloadTest.java
index 15e4d07622..c8b7f0d060 100644
--- a/common/transport/lwm2m/src/test/java/org/thingsboard/server/transport/lwm2m/server/LwM2mServerCertificateReloadTest.java
+++ b/common/transport/lwm2m/src/test/java/org/thingsboard/server/transport/lwm2m/server/LwM2mServerCertificateReloadTest.java
@@ -159,6 +159,9 @@ public class LwM2mServerCertificateReloadTest {
         LwM2mServerListener serverListener = new LwM2mServerListener(mockHandler);
         ReflectionTestUtils.setField(lwm2mTransportService, "serverListener", serverListener);
 
+        // Force getLhServer() to fail by returning null host
+        when(mockConfig.getHost()).thenReturn(null);
+
         // Invoke the callback — new server creation will fail, old listeners should stay
         callbackCaptor.getValue().run();