ln.types/test/WeakKeyDictionaryTests.cs

using System;
using NUnit.Framework;
using ln.types.collections;
using System.Threading;
namespace ln.types.test
{
	[TestFixture]
	public class WeakKeyDictionaryTests
	{
		class KeyClass
		{
			static int next = 0;

			public readonly int Value = next++;

            public KeyClass() { }
            public KeyClass(int value) { this.Value = value; }

            public override int GetHashCode() => Value;
			public override bool Equals(object obj)
			{
				return ((obj is KeyClass) && ((obj as KeyClass).Value == Value));
			}
			public override string ToString()
			{
				return string.Format("[KeyClass Value={0}]",Value);
			}
		}

		KeyClass[] keys = new KeyClass[1024];
		WeakKeyDictionary<KeyClass, int> testDict = new WeakKeyDictionary<KeyClass, int>();

		public void Fill()
		{
			for (int n = 0; n < keys.Length; n++)
			{
				keys[n] = new KeyClass();
				testDict.Add(keys[n], n);
			}
		}

		public void Strip()
		{
			keys[0] = null;
			keys[keys.Length - 1] = null;
		}

		[TestCase()]
		public void TestWeakKeyDictionary()
		{
			Fill();

			Thread.Sleep(250);

			Assert.AreEqual(keys.Length, testDict.Count);
			Assert.AreEqual(keys.Length, testDict.Keys.Count);

			Strip();

			Thread.Sleep(250);

            GC.Collect();
            GC.Collect();

            Thread.Sleep(250);

            GC.Collect();

            Assert.AreEqual(keys.Length-2, testDict.Keys.Count);

            KeyClass key0 = new KeyClass(0);

            Assert.IsFalse(testDict.ContainsKey(key0));
            Assert.IsTrue(testDict.ContainsKey(keys[1]));
            Assert.IsTrue(testDict.ContainsKey(keys[keys.Length-2]));

        }
    }
}