testland/multiplayer-state-machine-coverage

Build a coverage matrix for a networked-game state machine that exercises connect / authority-handoff / disconnect / reconnect / host-migration paths across Unity Netcode for GameObjects, Unreal Engine replication, and Mirror Networking. Workflow: enumerate the engine's connection states + ownership states + replicated-property update rules, cross them against latency / loss / out-of-order packet injection, encode each combination as a test fixture, and emit a go / no-go gate. Use before submitting a multiplayer title to platform cert - Microsoft's cert guide lists 'Multiplayer does not work as expected' as one of the most common Hold reasons, and Xbox XR-067 (MPSD session state) is failed by uncovered state-machine paths.

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Networked engine state and ownership tables - reference

Name: testland/multiplayer-state-machine-coverage
Rating: 74.4 (1 reviews)
Author: testland

Per-engine connection-state and authority-state enumerations for multiplayer-state-machine-coverage Steps 1-2. The matrix is fixed by each framework - you cannot add or remove states, only choose which to cover.

Connection states

Unity Netcode for GameObjects (per the v2.11 manual):

State	Trigger	Observability
`Disconnected`	Initial / after disconnect	`NetworkManager.IsConnectedClient == false`
`Connecting`	`NetworkManager.StartClient()` invoked	Between request and approval
`Connected (Approved)`	Server accepts client	`OnClientConnectedCallback`
`Connected (Pending Spawn)`	Approved but player object not yet spawned	Wait for `OnNetworkSpawn`
`Connected (Spawned)`	`NetworkObject.IsSpawned == true`	Gameplay-ready
`Disconnecting`	`Shutdown()` / link loss	`OnClientDisconnectCallback` fires next
`Host`	Same process is both server + client	`NetworkManager.IsHost`

Unreal Engine replication (per the Networking Overview):

State	Trigger	Observability
`NM_Standalone`	Single-player	`World->GetNetMode()`
`NM_DedicatedServer`	"Separate machine with no local players"	`IsRunningDedicatedServer()`
`NM_ListenServer`	"Host machine where the server operator also plays locally"	`IsRunningListenServer()`
`NM_Client`	Connected as remote client	`World->IsClient()`
`Login`	`AGameModeBase::PreLogin` → `Login` → `PostLogin`	Override `PostLogin`
`Travel` (seamless / hard)	`ServerTravel` to new map	`PlayerController->bIsClientReplicationPausedForFrame`
`Logout`	`Logout()` callback	Override on `GameModeBase`

Mirror Networking (per the Mirror docs on NetworkBehaviour):

State	Trigger	Observability
`OnStartServer`	"called on server when a game object spawns on the server"	NetworkBehaviour override
`OnStartClient`	"called on clients when the game object spawns on the client"	NetworkBehaviour override
`OnStartLocalPlayer`	Local player only, after `OnStartClient`	NetworkBehaviour override
`OnStartAuthority` / `OnStopAuthority`	"Called when ownership changes"	NetworkBehaviour override
`OnStopServer` / `OnStopClient`	"Cleanup when objects are destroyed"	NetworkBehaviour override

Ownership / authority states

Engine	Authority states
Unity NGO	`OwnerClientId` (per `NetworkObject`); `IsOwner`, `IsServer`, `IsHost` flags
Unreal	`ROLE_Authority` (server), `ROLE_AutonomousProxy` (owning client), `ROLE_SimulatedProxy` (other clients), `ROLE_None`
Mirror	`isServer`, `isClient`, `isLocalPlayer`, `isOwned` per Mirror NetworkBehaviour docs - `isOwned` "Returns true on the client if this client has authority over this game object"