public void GetSnapshotAndGC()
{
var dict = new MultiVersionDictionary <V>();
dict.AddOrUpdate("a", 1, new V(1));
dict.AddOrUpdate("b", 2, new V(2));
dict.AddOrUpdate("c", 3, new V(3));
dict.AddOrUpdate("a", 4, new V(4));
dict.AddOrUpdate("a", 5, new V(5));
dict.TryRemove("b", 6);
dict.AddOrUpdate("c", 7, new V(7));
dict.AddOrUpdate("b", 8, new V(8));
var ss0 = dict.GetSnapshot(0).ToArray();
Assert.AreEqual(0, ss0.Length);
var ss1 = dict.GetSnapshot(1).ToArray();
Assert.AreEqual(1, ss1.Length);
Assert.AreEqual(1, ss1[0].Item1);
Assert.AreEqual("a", ss1[0].Item2);
var ss3 = dict.GetSnapshot(3).ToArray();
Assert.AreEqual(3, ss3.Length);
var ss5 = dict.GetSnapshot(5).OrderBy(x => x.Item2).ToArray();
Assert.AreEqual(3, ss5.Length);
var ss6 = dict.GetSnapshot(6).OrderBy(x => x.Item2).ToArray();
Assert.AreEqual(2, ss6.Length);
var ss8 = dict.GetSnapshot(8).OrderBy(x => x.Item2).ToArray();
Assert.AreEqual(3, ss8.Length);
dict.RemoveOldVersionValues(6);
}
