Avoiding IDisposable while still working with unmanaged resources

using System;
using System.IO;
using System.Reflection;
using System.Resources;

using Pvax.Shell;

using NUnit.Framework;

namespace Pvax.Shell.Tests
{
	[TestFixture]
	public class TestShellLink
	{
		private string testFolderPath;

		[TestFixtureSetUp]
		public void FixtureInit()
		{
			testFolderPath = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Personal), "Pvax.Shell.Tests");
			Directory.CreateDirectory(testFolderPath);
		}

		[TestFixtureTearDown]
		public void FixtureDone()
		{
			string[] files = Directory.GetFiles(testFolderPath, "*.*");
			foreach(string file in files)
				File.Delete(file);
			Directory.Delete(testFolderPath);
		}

		[Test]
		public void TestArguments()
		{
			ShellLink link = new ShellLink();
			link.Arguments = null;
			Assert.AreEqual("", link.Arguments);
			link.Arguments = "/b";
			Assert.AreEqual("/b", link.Arguments);
		}

		[Test]
		public void TestDescription()
		{
			ShellLink link = new ShellLink();
			link.Description = null;
			Assert.AreEqual("", link.Description);
			link.Description = "Some textual description";
			Assert.AreEqual("Some textual description", link.Description);
		}

		private const short hotkey = 0x09 | (0x04 << 8); // VK_TAB | (HOTKEYF_ALT << 8);

		[Test]
		public void TestHotkey()
		{
			ShellLink link = new ShellLink();
			link.Hotkey = hotkey;
			Assert.AreEqual(hotkey, link.Hotkey);
		}

		[Test]
		public void TestIconPath()
		{
			ShellLink link = new ShellLink();
			link.IconPath = null;
			Assert.AreEqual("", link.IconPath);
			link.IconPath = @"C:\Windows\System32\shell32.dll";
			Assert.AreEqual(@"C:\Windows\System32\shell32.dll", link.IconPath);
		}

		[Test]
		public void TestIconIndex()
		{
			ShellLink link = new ShellLink();
			link.IconIndex = 3;
			Assert.AreEqual(3, link.IconIndex);
		}

		[Test]
		public void TestPath()
		{
			ShellLink link = new ShellLink();
			link.Path = null;
			Assert.AreEqual("", link.Path);
			link.Path = @"C:\Windows\System32\user32.dll";
			Assert.AreEqual(@"C:\Windows\System32\user32.dll", link.Path);
		}

		[Test]
		public void TestShowCmd()
		{
			ShellLink link = new ShellLink();
			link.ShowCmd = ShellLink.ShowCommand.ShowMinimized;
			Assert.AreEqual(ShellLink.ShowCommand.ShowMinimized, link.ShowCmd);
		}

		[Test]
		public void TestWorkingDirectory()
		{
			ShellLink link = new ShellLink();
			link.WorkingDirectory = null;
			Assert.AreEqual("", link.WorkingDirectory);
			link.WorkingDirectory = @"C:\";
			Assert.AreEqual(@"C:\", link.WorkingDirectory);
		}

		[Test]
		public void TestSaveLoad()
		{
			{
				ShellLink link = new ShellLink();
				link.Path = @"%SystemRoot%\System32\kernel32.dll";
				link.Description = "Windows\' kernel API";
				link.Save(System.IO.Path.Combine(testFolderPath, "kernel32.lnk"));
			}
			{
				ShellLink link = new ShellLink();
				link.Load(System.IO.Path.Combine(testFolderPath, "kernel32.lnk"));
				Assert.AreEqual(System.IO.Path.Combine(Environment.SystemDirectory, "kernel32.dll").ToLower(), link.Path.ToLower());
				Assert.AreEqual("Windows\' kernel API", link.Description);
			}
		}
	}
}