public virtual void TestContains() { NUnit.Framework.Assert.IsTrue(underlying.Contains("foo1")); NUnit.Framework.Assert.IsFalse(underlying.Contains("foo5")); NUnit.Framework.Assert.IsFalse(underlying.Contains("foo7")); NUnit.Framework.Assert.IsTrue(spillover.Contains("foo1")); NUnit.Framework.Assert.IsTrue(spillover.Contains("foo5")); NUnit.Framework.Assert.IsFalse(spillover.Contains("foo7")); }