diff --git a/Assets/Mirror/Tests/Runtime/HostSetup.cs b/Assets/Mirror/Tests/Runtime/HostSetup.cs
index 1e1f40d04..65f368aad 100644
--- a/Assets/Mirror/Tests/Runtime/HostSetup.cs
+++ b/Assets/Mirror/Tests/Runtime/HostSetup.cs
@@ -18,6 +18,16 @@ public class HostSetup
         protected virtual void afterStartHost() { }
         protected virtual void beforeStopHost() { }
 
+        protected static void FakeSpawnServerClientIdentity(NetworkIdentity serverNI, NetworkIdentity clientNI)
+        {
+            serverNI.OnStartServer();
+            serverNI.RebuildObservers(true);
+
+            clientNI.netId = serverNI.netId;
+            NetworkIdentity.spawned[serverNI.netId] = clientNI;
+            clientNI.OnStartClient();
+        }
+
         [UnitySetUp]
         public IEnumerator SetupHost()
         {