fix: Fixes flaky tests, formatting, and sequential testing. (#2168)

Projects/UOContent.Tests/Fixtures/UOContentFixture.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Reflection;
+using Server.Misc;
+using Xunit;
+
+namespace Server.Tests;
+
+[CollectionDefinition("Sequential UOContent Tests", DisableParallelization = true)]
+public class UOContentFixture : ICollectionFixture<UOContentFixture>, IDisposable
+{
+    public UOContentFixture()
+    {
+        Core.ApplicationAssembly = Assembly.GetExecutingAssembly();
+        Core.LoopContext = new EventLoopContext();
+        Core.Expansion = Expansion.EJ;
+
+        // Load Configurations
+        ServerConfiguration.Load(true);
+
+        // Load UOContent.dll into the type resolver
+        ServerConfiguration.AssemblyDirectories.Add(Core.BaseDirectory);
+        AssemblyHandler.LoadAssemblies(["Server.dll", "UOContent.dll"]);
+
+        // Load Skills
+        SkillsInfo.Configure();
+
+        // Configure / Initialize
+        TestMapDefinitions.ConfigureTestMapDefinitions();
+
+        // Configure the world
+        World.Configure();
+
+        Timer.Init(0);
+
+        // Configure Races
+        RaceDefinitions.Configure();
+
+        // Load the world
+        World.Load();
+
+        World.ExitSerializationThreads();
+    }
+
+    private static int _counter;
+
+    public void Dispose()
+    {
+        _counter++;
+
+        if (_counter > 1)
+        {
+            throw new Exception("NO!");
+        }
+        Timer.Init(0);
+    }
+}