diff --git a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
index 98a3b1d..6ca47a8 100644
--- a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
+++ b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
@@ -2678,19 +2678,30 @@
     public void testUpstreamNetworkChanged() {
         final Tethering.TetherMainSM stateMachine = (Tethering.TetherMainSM)
                 mTetheringDependencies.mUpstreamNetworkMonitorSM;
+        final InOrder inOrder = inOrder(mNotificationUpdater);
+
         // Gain upstream.
         final UpstreamNetworkState upstreamState = buildMobileIPv4UpstreamState();
         initTetheringUpstream(upstreamState);
         stateMachine.chooseUpstreamType(true);
         mTetheringEventCallback.expectUpstreamChanged(upstreamState.network);
-        verify(mNotificationUpdater)
+        inOrder.verify(mNotificationUpdater)
                 .onUpstreamCapabilitiesChanged(upstreamState.networkCapabilities);
 
+        // Set the upstream with the same network ID but different object.
+        final UpstreamNetworkState upstreamState2 = buildMobileIPv4UpstreamState();
+        initTetheringUpstream(upstreamState2);
+        stateMachine.chooseUpstreamType(true);
+        // Bug: duplicated upstream change event.
+        mTetheringEventCallback.expectUpstreamChanged(upstreamState2.network);
+        inOrder.verify(mNotificationUpdater)
+                .onUpstreamCapabilitiesChanged(upstreamState2.networkCapabilities);
+
         // Lose upstream.
         initTetheringUpstream(null);
         stateMachine.chooseUpstreamType(true);
         mTetheringEventCallback.expectUpstreamChanged(NULL_NETWORK);
-        verify(mNotificationUpdater).onUpstreamCapabilitiesChanged(null);
+        inOrder.verify(mNotificationUpdater).onUpstreamCapabilitiesChanged(null);
     }
 
     @Test