protected virtual void SetUp() { underlying = new HashIndex <string>(); underlying.Add("foo0"); underlying.Add("foo1"); underlying.Add("foo2"); underlying.Add("foo3"); underlying.Add("foo4"); NUnit.Framework.Assert.AreEqual(5, underlying.Count); spillover = new DeltaIndex <string>(underlying); spillover.Add("foo1"); spillover.Add("foo5"); spillover.Add("foo6"); }