Fix test threading (#31669)

Content.IntegrationTests/Tests/Actions/ActionPvsDetachTest.cs

@@ -32,11 +32,16 @@ public sealed class ActionPvsDetachTest
         // PVS-detach action entities
         // We do this by just giving them the ghost layer
         var visSys = server.System<VisibilitySystem>();
+
+        await server.WaitPost(() =>
+        {
             var enumerator = server.Transform(ent).ChildEnumerator;
             while (enumerator.MoveNext(out var child))
             {
                 visSys.AddLayer(child, (int)VisibilityFlags.Ghost);
             }
+        });
+
         await pair.RunTicksSync(5);
 
         // Client's actions have left been detached / are out of view, but action comp state has not changed
@@ -44,11 +49,14 @@ public sealed class ActionPvsDetachTest
         Assert.That(cSys.GetActions(cEnt).Count(), Is.EqualTo(initActions));
 
         // Re-enter PVS view
-        enumerator = server.Transform(ent).ChildEnumerator;
+        await server.WaitPost(() =>
+        {
+            var enumerator = server.Transform(ent).ChildEnumerator;
             while (enumerator.MoveNext(out var child))
             {
                 visSys.RemoveLayer(child, (int) VisibilityFlags.Ghost);
             }
+        });
         await pair.RunTicksSync(5);
         Assert.That(sys.GetActions(ent).Count(), Is.EqualTo(initActions));
         Assert.That(cSys.GetActions(cEnt).Count(), Is.EqualTo(initActions));

Content.IntegrationTests/Tests/Buckle/BuckleDragTest.cs

@@ -34,7 +34,11 @@ public sealed class BuckleDragTest : InteractionTest
         Assert.That(pullable.BeingPulled, Is.False);
 
         // Strap the human to the chair
+        await Server.WaitAssertion(() =>
+        {
             Assert.That(Server.System<SharedBuckleSystem>().TryBuckle(sUrist, SPlayer, STarget.Value));
+        });
+
         await RunTicks(5);
         Assert.That(buckle.Buckled, Is.True);
         Assert.That(buckle.BuckledTo, Is.EqualTo(STarget));

Content.IntegrationTests/Tests/CargoTest.cs

@@ -257,9 +257,12 @@ public sealed class CargoTest
         var entManager = server.ResolveDependency<IEntityManager>();
         var priceSystem = entManager.System<PricingSystem>();
 
+        await server.WaitAssertion(() =>
+        {
             var ent = entManager.SpawnEntity("StackEnt", MapCoordinates.Nullspace);
             var price = priceSystem.GetPrice(ent);
             Assert.That(price, Is.EqualTo(100.0));
+        });
 
         await pair.CleanReturnAsync();
     }

Content.IntegrationTests/Tests/Commands/SuicideCommandTests.cs

@@ -143,10 +143,10 @@ public sealed class SuicideCommandTests
             mobStateComp = entManager.GetComponent<MobStateComponent>(player);
             mobThresholdsComp = entManager.GetComponent<MobThresholdsComponent>(player);
             damageableComp = entManager.GetComponent<DamageableComponent>(player);
-        });
 
             if (protoMan.TryIndex<DamageTypePrototype>("Slash", out var slashProto))
                 damageableSystem.TryChangeDamage(player, new DamageSpecifier(slashProto, FixedPoint2.New(46.5)));
+        });
 
         // Check that running the suicide command kills the player
         // and properly ghosts them without them being able to return to their body

Content.IntegrationTests/Tests/Shuttle/DockTest.cs

@@ -97,13 +97,14 @@ public sealed class DockTest : ContentUnitTest
         var entManager = server.ResolveDependency<IEntityManager>();
         var dockingSystem = entManager.System<DockingSystem>();
         var mapSystem = entManager.System<SharedMapSystem>();
+        MapGridComponent mapGrid = default!;
 
-        var mapGrid = entManager.AddComponent<MapGridComponent>(map.MapUid);
         var shuttle = EntityUid.Invalid;
 
         // Spawn shuttle and affirm no valid docks.
         await server.WaitAssertion(() =>
         {
+            mapGrid = entManager.AddComponent<MapGridComponent>(map.MapUid);
             entManager.DeleteEntity(map.Grid);
             Assert.That(entManager.System<MapLoaderSystem>().TryLoad(otherMap.MapId, "/Maps/Shuttles/emergency.yml", out var rootUids));
             shuttle = rootUids[0];