A test that verifies that dynamic assemblies with method builder are garbage collected

MethodBuilderGarbageCollection.cs

using HarmonyLib;
using NUnit.Framework;
using System;
using System.Reflection;
using System.Reflection.Emit;

namespace HarmonyLibTests
{
	[TestFixture]
	public class TestMethodBuilder
	{
		public static string Original()
		{
			try
			{
				return "Foo";
			}
			catch (Exception)
			{
				throw;
			}
		}

		[Test]
		public void TestGarbageCollection()
		{
			var currentDomain = AppDomain.CurrentDomain;
			GC.Collect();
			var baseCount = currentDomain.GetAssemblies().Length;
			for (var i = 1; i <= 10; i++)
			{
				var abuilder = currentDomain.DefineDynamicAssembly(new AssemblyName("assembly" + i), AssemblyBuilderAccess.RunAndCollect);
				var mBuilder = abuilder.DefineDynamicModule("assembly" + i, "assembly" + i + ".exe");
				var tBuilder = mBuilder.DefineType("TestType", TypeAttributes.Public);
				var meBuilder = tBuilder.DefineMethod("TestMethod", MethodAttributes.Public | MethodAttributes.Static, typeof(string), new Type[0]);

				var generator = meBuilder.GetILGenerator();
				generator.Emit(OpCodes.Ldstr, "Hello World" + i);
				generator.Emit(OpCodes.Ret);

				var aType = tBuilder.CreateType();
				var method = aType.GetMethod("TestMethod");
				Assert.IsNotNull(method);

				var original = typeof(TestMethodBuilder).GetMethod("Original");
				Assert.IsNotNull(original);

				var error = Memory.DetourMethod(original, method);
				Assert.IsNull(error);

				var res = Original();
				Assert.AreEqual(res, "Hello World" + i);

				Assert.AreEqual(currentDomain.GetAssemblies().Length, baseCount + 1);
				GC.Collect();
				Assert.AreEqual(currentDomain.GetAssemblies().Length, baseCount);
			}
		}
	}
}