Misc mind tweaks and fixes (#20614)

Content.IntegrationTests/Tests/Minds/MindTest.DeleteAllThenGhost.cs

@@ -0,0 +1,55 @@
+#nullable enable
+using Robust.Shared.Console;
+using Robust.Shared.Map;
+
+namespace Content.IntegrationTests.Tests.Minds;
+
+[TestFixture]
+public sealed partial class MindTests
+{
+    [Test]
+    public async Task DeleteAllThenGhost()
+    {
+        var settings = new PoolSettings
+        {
+            Dirty = true,
+            DummyTicker = false,
+            Connected = true
+        };
+        await using var pair = await PoolManager.GetServerClient(settings);
+
+        // Client is connected with a valid entity & mind
+        Assert.That(pair.Client.EntMan.EntityExists(pair.Client.Player?.ControlledEntity));
+        Assert.That(pair.Server.EntMan.EntityExists(pair.PlayerData?.Mind));
+
+        // Delete **everything**
+        var conHost = pair.Server.ResolveDependency<IConsoleHost>();
+        await pair.Server.WaitPost(() => conHost.ExecuteCommand("entities delete"));
+        await pair.RunTicksSync(5);
+
+        Assert.That(pair.Server.EntMan.EntityCount, Is.EqualTo(0));
+        Assert.That(pair.Client.EntMan.EntityCount, Is.EqualTo(0));
+
+        // Create a new map.
+        int mapId = 1;
+        await pair.Server.WaitPost(() => conHost.ExecuteCommand($"addmap {mapId}"));
+        await pair.RunTicksSync(5);
+
+        // Client is not attached to anything
+        Assert.Null(pair.Client.Player?.ControlledEntity);
+        Assert.Null(pair.PlayerData?.Mind);
+
+        // Attempt to ghost
+        var cConHost = pair.Client.ResolveDependency<IConsoleHost>();
+        await pair.Client.WaitPost(() => cConHost.ExecuteCommand("ghost"));
+        await pair.RunTicksSync(10);
+
+        // Client should be attached to a ghost placed on the new map.
+        Assert.That(pair.Client.EntMan.EntityExists(pair.Client.Player?.ControlledEntity));
+        Assert.That(pair.Server.EntMan.EntityExists(pair.PlayerData?.Mind));
+        var xform = pair.Client.Transform(pair.Client.Player!.ControlledEntity!.Value);
+        Assert.That(xform.MapID, Is.EqualTo(new MapId(mapId)));
+
+        await pair.CleanReturnAsync();
+    }
+}