public void Basic()
        {
            CopyOnWriteHashtable c = new CopyOnWriteHashtable(StringComparer.OrdinalIgnoreCase);
            CopyOnWriteHashtable b = (CopyOnWriteHashtable)c.Clone();
            CopyOnWriteHashtable a = (CopyOnWriteHashtable)b.Clone();

            c["Foo"] = "Bar";

            // Just wrote to 'c' so it should contain data.
            Assertion.Assert(c.ContainsKey("Foo"));
            
            // Writing to a depended upon hashtable should not be visible to the dependents.
            Assertion.Assert(!a.ContainsKey("Foo"));
            Assertion.Assert(!b.ContainsKey("Foo"));
        }