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");
}
