public void TestAddMultipleAndGet()
        {
            var dictionary = new BinaryTreeDictionary <int, string>();

            dictionary.Add(8, "eight");
            dictionary.Add(3, "three");
            dictionary.Add(6, "six");
            dictionary.Add(4, "four");

            Assert.IsTrue(dictionary.ContainsKey(6));
        }
        public void TestDontAddAndDontGet()
        {
            var dictionary = new BinaryTreeDictionary <int, string>();

            Assert.IsFalse(dictionary.ContainsKey(1));
        }