feat: increase hybrid prefab test coverage

[NoelStephensUnity]

Purpose of this PR

This PR gets 232 test cases, from 26 of the 117 NGO runtime SDK integration test fixtures (Tests/Runtime), running in hybrid prefab mode (UnifiedHost / UnifiedServer).

PR Scope:

This PR's focuses on covering NGO features that work with the unified API today (i.e. the connection sequence, RPCs, NetworkVariables, spawning and ownership).

Out of this PR's scope:

• Tests that required major adjustments or were outside of the current supported feature sets (NGO & N4E).
• As an example:
  • All time travel-based tests (the time travel approach does not work with unified and providing the same tests coverage could require new, hybrid specific, tests), AttachableBehaviour (parenting consolidation is separate work), owner-authoritative NetworkTransform, and the NetworkRigidbody tests.
  • NetworkTransform tests have no relevance when using hybrid prefabs.
  • etc.

Test helper changes

• All hybrid test cases run over the unified transport.
• N4E worlds and UnifiedNetcodeTransport only start when at least one hybrid prefab is registered.
  • The test base class does not create hybrid player prefabs, so a UnifiedHost test case that only spawned players runs in "normal" NGO mode.
    • CreateServerAndClients now registers a UnifiedSessionPrefab if a hybrid test case does not register at least one of its own.

Tests included (hybrid fixtures + UseUnifiedTests() => true):

Area	Fixtures
RPCs	RpcTypeSerializationTests (132 cases), RpcTests, RpcDuringOnNetworkSpawn
NetworkVariables	NetworkVariableGeneralTests, NetworkListTests, NetworkVariableCollectionsTests, NetworkVariableCollectionsChangingTests, NetworkVariableTraitsTests, NetworkVariablePermissionTests, NetworkVariableInheritanceTests, NetworkVarBufferCopyTest, OwnerModifiedTests, NetworkBehaviourUpdaterTests
Connection sequence	ConnectionApprovalTests, ConnectionApprovalTimeoutTests, ClientApprovalDenied, NetworkManagerPlayerPrefab
Spawning / ownership	NetworkObjectOnNetworkDespawnTests, NetworkObjectOwnershipTests, NetworkBehaviourPrePostSpawnTests, NetworkObjectSynchronizationTests (late join), PlayerSpawnObjectVisibilityTests, ComponentControllerTests, MessageReceiveAllocationTests
Parenting	NetworkTransformAutoParenting (NGO parenting of hybrid objects)

Adjustments needed

• Ghosts spawn from a snapshot, later than NGO's spawn message. Tests that read SpawnedObjects immediately after a spawn or a late join now use WaitForSpawnedOnAllOrTimeOut (NetworkVariablePermissionTests, NetworkVariableInheritanceTests, NetworkObjectSynchronizationTests). ComponentControllerTests predicates were missing a continue and threw instead of waiting.
• RpcTests, RpcTypeSerializationTests and ClientApprovalDenied now have explicit Host / Server fixture arguments. NUnit drops a bare [TestFixture] when the class also has parameterized fixtures. This renames their test IDs (e.g. RpcTests.TestRpcs → RpcTests(Host).TestRpcs).
• NetworkObjectDeserializationFailure is ignored for hybrid prefabs. Removing a prefab from one client's NetworkConfig does not unregister its ghost prefab, because all worlds in the test process share that registration.

Tests that were refactored:

Test-specific values that only configure a prefab now use arrays generated inside the test instead of expanded into [TestFixture]s:

• NetworkBehaviourUpdaterTests: 36 fixtures → 5. Client count grows during the test, so the 1 and 2 client cases now include a late-joined client instead of a fresh session per case.
• NetworkVariableCollectionsChangingTests: 10 fixtures → 5. Each test runs List then Dictionary.

	Before	After
NetworkBehaviourUpdaterTests unified	15 fixtures, 16.02 s	2 fixtures, 8.61 s
NetworkBehaviourUpdaterTests non-unified	21 fixtures, 10.65 s	3 fixtures, 6.59 s
NetworkVariableCollectionsChangingTests unified	4 fixtures, 33.88 s	2 fixtures, 29.98 s
NetworkVariableCollectionsChangingTests non-unified	6 fixtures, 39.15 s	3 fixtures, 38.60 s

Issues found and will require one (or more) follow-up PR(s)

1. NetworkManager shutdown calls World.DisposeAllWorlds(), so one client shutting down disposes the server's and every other client's world in the same process. Disposing only the NetworkManager's own NetcodeWorld (local experiment, not in this PR) took NetworkObjectDontDestroyWithOwnerTests from 0/6 to 5/6 and the NetworkSpawnManagerTests connect/disconnect cases from 2/4 to 4/4.
2. A client-initiated disconnect does not raise the client's own disconnect event, and peers receive 1 of 2 expected notifications (DisconnectTests, PeerDisconnectCallbackTests ClientDisconnectsFromServer). This still fails with (1) fixed.
3. Instantiating a hybrid prefab and destroying it without spawning logs N4E's "not a valid ghost (ghostId == 0)" error (NetworkBehaviourReferenceTests, NetworkTransformOrderOfOperations, PlayerObjectTests).
4. The expected prefab handler instantiate exception does not appear for hybrid spawns (NetworkPrefabHandlerSynchronizationTests).
5. NGO's connection-approval player spawn, NetworkSpawnManager.InstantiateNetworkPrefab does not select the NetworkManager world before instantiating a hybrid prefab. So, hybrid player prefabs fail when several worlds share a process. (This should be resolved with GhostObject.DelaySpawning / Spawn() as a separate PR).

All tests impacted by the above issues were not included in this PR.

Jira ticket

MTT-16201

Documentation

• No documentation changes or additions were necessary.

Testing & QA (How your changes can be verified during release Playtest)

The unified result is from the Yamato unified job on this PR (6000.7.0b3, N4E 7.0.0). The non-unified results are headless PlayMode runs on 6000.7.0b1 (bundles N4E 7.0.0) with the unified job's scripting defines, filtered to the touched fixtures. Each result is from one run.

Run	Passed	Failed	Skipped
Unified job, UNIFIED_TESTS=true	233	0	6409 (tests not opted in excluded)
UNIFIED_TESTS unset, this branch	271	0	—
UNIFIED_TESTS unset, develop-3.x.x	316	0	—

• The unified job's 233 is the 232 hybrid cases plus one testproject documentation test (DocumentationCodeSamples.CommandLineOptionsDocsTests). The 4 hybrid NetworkObjectDeserializationFailure cases are ignored by design and counted as skipped.
• Non-unified coverage is unchanged. The 45 fewer cases on this branch come from the two consolidated fixtures, whose values now run inside the test (NetworkBehaviourUpdaterTests 42 → 3, NetworkVariableCollectionsChangingTests 12 → 6).

Functional Testing

Manual testing :

• Manual testing done

Automated tests:

• Covered by existing automated tests
• Covered by new automated tests

Does the change require QA team to:

• Review automated tests?
• Execute manual tests?
• Provide feedback about the PR?

Up-port

Not needed. Hybrid prefab mode only exists on develop-3.x.x.

Backports

Not needed.

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💡 Harness Review

The change expands unified hybrid test coverage and consolidates two test suites; I examined fixture selection, hybrid startup, synchronization waits, and spawn and despawn behavior without finding an actionable issue.

_{Reviewed commit 5f4c87a}

_{🤖 Helpful? 👍/👎}

[codecov-github-com]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@              Coverage Diff               @@
##           develop-3.x.x    #4172   +/-   ##
==============================================
  Coverage          78.19%   78.19%           
==============================================
  Files                153      153           
  Lines              26272    26272           
==============================================
  Hits               20544    20544           
  Misses              5728     5728           

Flag	Coverage Δ
NGOv2_project_testproject_ubuntu	76.64% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
com.unity.netcode.gameobjects	78.19% <ø> (ø)

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