public void GetOrCreate()
{
var a = new LruDictionary <int, string>(15);
var removed = new HashSet <int>();
var s1 = a.GetOrCreate(1, () => ("one", 3), (k, v, s) => removed.Add(1));
Assert.IsTrue(s1 == "one");
Assert.IsTrue(a.Count == 1);
Assert.IsTrue(a.ContainsKey(1));
var s1a = a.GetOrCreate(1, () => throw new Exception(), (k, v, s) => removed.Add(-1));
Assert.IsTrue(s1 == "one");
Assert.IsTrue(a.Count == 1);
Assert.IsTrue(a.ContainsKey(1));
Assert.IsTrue(a.Remove(1, true));
Assert.IsTrue(removed.Contains(1));
Assert.IsTrue(!removed.Contains(-1));
Assert.IsTrue(a.Count == 0);
}