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ClientSimSession

Tsvrc.UdonTestKit.ClientSimSession starts ClientSim for a Play Mode test, gives the test real VRCPlayerApi players, and ends ClientSim so that nothing of it is left running. ClientSimTestBase holds one and ends it after every test; create one yourself only when your test class doesn't extend it.

var session = new ClientSimSession();
yield return session.Start();

VRCPlayerApi remote = session.SpawnRemotePlayer("Remote");
// ...

session.End();

Starting​

Start(bool localPlayerIsMaster = true) is a coroutine, so yield return it from a [UnityTest] or a [UnitySetUp]. It returns once the local player has joined and, with player persistence on, once that player's saved data is restored. ClientSim reports that it's ready before the restore, and a PlayerData change made in between is never saved, so returning on "ready" alone would lose the first thing a test writes.

Before ClientSim starts, Start does two things:

  1. It runs the same project settings check ClientSim runs, and fails the test if it doesn't pass. The failure message names each setting that fails and the menu item that fixes them, described in ClientSimProjectSettings.
  2. When no loaded scene has a scene descriptor, it adds one: a GameObject named __TestSceneDescriptor with a single spawn point at the origin. ClientSim refuses to start without a descriptor. When a scene already has one, such as your world's own scene, the session adds nothing and the local player spawns at that descriptor's spawn point.

With localPlayerIsMaster: false, ClientSim spawns a remote player before the local one, and that remote player is the master. The session then starts with two players.

If ClientSim isn't ready within 10 seconds, Start throws a TimeoutException.

Players​

SpawnRemotePlayer(string displayName) spawns a remote player and returns it. The player is in the player list by the time the call returns, so a test can assert on it in the same frame. The returned player is looked up by display name, so give every player its own.

RemovePlayer(VRCPlayerApi player) removes a player, also within the call.

ClientSimSession.FindPlayerByName(string displayName) is static and returns the player with that display name, or null when there's none.

Ownership​

SetOwner(VRCPlayerApi player, GameObject obj) makes player the owner of obj, the way Networking.SetOwner does in VRChat.

ClientSim tracks an owner only for GameObjects with VRCObjectSync or VRCObjectPool. The master owns every other GameObject, including one holding an UdonSharpBehaviour, and Networking.SetOwner leaves it unchanged. In VRChat, every networked GameObject's owner can change, so code that takes ownership can't be tested against ClientSim as it is.

SetOwner gives such a GameObject an owner of its own. It adds a hidden component that ClientSim reads and writes ownership through, starting from the GameObject's current owner, the master, as in VRChat. Then it moves ownership to player. From then on, Networking.SetOwner calls on that GameObject move its ownership too, including the ones the code under test makes. When the owner leaves, through RemovePlayer, the master becomes the owner, as ClientSim does for VRCObjectSync. Calling SetOwner again reuses the component instead of adding another. On a GameObject that already has VRCObjectSync or VRCObjectPool, it only calls Networking.SetOwner.

To test code that moves ownership itself while the local player still owns the GameObject, give it its starting owner first with SetOwner(Networking.LocalPlayer, obj). Without it, ClientSim ignores the code's own Networking.SetOwner calls. Test what happens for a player who isn't the owner shows it in a test.

Ending​

End() stops ClientSim, stops it saving player data, and removes the scene descriptor Start added, if it added one. It's safe to call when no session is running, so a teardown can call it unconditionally.

ClientSim keeps each player's saved data on a hidden object that its own teardown never destroys. That object keeps rewriting the player's save file after ClientSim stops, and overwrites whatever a later session in the same scene saves. End destroys it. With nothing left running, the next session in the same scene starts from the data the last one saved, the way a player who leaves and rejoins does.

Saved data​

ClientSim saves each player's data in your project folder, one file per player and scene:

  • ClientSimStorage/PlayerData/PlayerData_<playerId>_<scene>.json
  • ClientSimStorage/PlayerObjects/PlayerObject_<playerId>_<scene>.json

ClientSimSession.DeleteSavedData() is static and deletes both kinds of file for the active scene, for every player. Nothing else in the kit deletes saved data: in your world's own scene, those files are your ClientSim data. Check that saved data survives a rejoin uses both.

Unity Test Framework gives its test scene a new name on every run, so each run leaves a few files in ClientSimStorage that no later run reads. You can delete them whenever you like.