Add some tests and fix some miscellaneous bugs (#22836)

* Add some tests and fix some bugs

* Add more helper methods

* remove submodule

* fix merge

* also fix DirtyAll()

* poke

Content.IntegrationTests/Tests/Networking/PvsCommandTest.cs

@@ -0,0 +1,51 @@
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map.Components;
+using Robust.Shared.Prototypes;
+
+namespace Content.IntegrationTests.Tests.Networking;
+
+[TestFixture]
+public sealed class PvsCommandTest
+{
+    public static EntProtoId TestEnt = "MobHuman";
+
+    [Test]
+    public async Task TestPvsCommands()
+    {
+        await using var pair = await PoolManager.GetServerClient(new PoolSettings { Connected = true, DummyTicker = false});
+        var (server, client) = pair;
+        await pair.RunTicksSync(5);
+
+        // Spawn a complex entity.
+        EntityUid entity = default;
+        await server.WaitPost(() => entity = server.EntMan.Spawn(TestEnt));
+        await pair.RunTicksSync(5);
+
+        // Check that the client has a variety pf entities.
+        Assert.That(client.EntMan.EntityCount, Is.GreaterThan(0));
+        Assert.That(client.EntMan.Count<MapComponent>, Is.GreaterThan(0));
+        Assert.That(client.EntMan.Count<MapGridComponent>, Is.GreaterThan(0));
+
+        var meta = client.MetaData(pair.ToClientUid(entity));
+        var lastApplied = meta.LastStateApplied;
+
+        // Dirty all entities
+        await server.ExecuteCommand("dirty");
+        await pair.RunTicksSync(5);
+        Assert.That(meta.LastStateApplied, Is.GreaterThan(lastApplied));
+        await pair.RunTicksSync(5);
+
+        // Do a client-side full state reset
+        await client.ExecuteCommand("resetallents");
+        await pair.RunTicksSync(5);
+
+        // Request a full server state.
+        lastApplied = meta.LastStateApplied;
+        await client.ExecuteCommand("fullstatereset");
+        await pair.RunTicksSync(10);
+        Assert.That(meta.LastStateApplied, Is.GreaterThan(lastApplied));
+
+        await server.WaitPost(() => server.EntMan.DeleteEntity(entity));
+        await pair.CleanReturnAsync();
+    }
+}