public void TurnContextStateCollection_PopPushSetFirst()
        {
            var ts    = new TurnContextStateCollection();
            var test1 = new object();
            var test2 = new object();
            var test3 = new object();

            Assert.IsNull(ts.Pop <object>(), "pop with no pushes is null");

            ts.Set(test1);
            Assert.AreEqual(test1, ts.Get <object>(), "test1 should be current");
            Assert.AreNotEqual(test2, ts.Get <object>(), "test1 should be current");
            Assert.AreNotEqual(test3, ts.Get <object>(), "test1 should  be current");

            ts.Push(test2);
            ts.Push(test3);

            // test3 should be current object
            Assert.AreNotEqual(test1, ts.Get <object>(), "test3 should be current");
            Assert.AreNotEqual(test2, ts.Get <object>(), "test3 should be current");
            Assert.AreEqual(test3, ts.Get <object>(), "test3 should be current");

            Assert.AreEqual(test2, ts.Pop <object>(), "pop should return test2");

            Assert.AreNotEqual(test1, ts.Get <object>(), "test2 should be current");
            Assert.AreEqual(test2, ts.Get <object>(), "test2 should be current");
            Assert.AreNotEqual(test3, ts.Get <object>(), "test2 should be current");

            Assert.AreEqual(test1, ts.Pop <object>(), "pop should return test1");

            Assert.AreEqual(test1, ts.Get <object>(), "test1 should be current");
            Assert.AreNotEqual(test2, ts.Get <object>(), "test1 should be current");
            Assert.AreNotEqual(test3, ts.Get <object>(), "test1 should be current");

            Assert.AreEqual(test1, ts.Pop <object>(), "pop should return test1");

            Assert.AreEqual(test1, ts.Get <object>(), "test1 should be current");
            Assert.AreNotEqual(test2, ts.Get <object>(), "test1 should be current");
            Assert.AreNotEqual(test3, ts.Get <object>(), "test1 should  be current");

            Assert.AreEqual(test1, ts.Pop <object>(), "pop should return test1");

            Assert.AreEqual(test1, ts.Get <object>(), "test1 should be current");
            Assert.AreNotEqual(test2, ts.Get <object>(), "test1 should be current");
            Assert.AreNotEqual(test3, ts.Get <object>(), "test1 should  be current");
        }
        public void TurnContextStateCollection_PopPushKey()
        {
            var ts    = new TurnContextStateCollection();
            var test1 = new object();
            var test2 = new object();
            var test3 = new object();

            var key = "test";

            Assert.IsNull(ts.Pop <object>(key), "pop with no pushes is null");

            ts.Push(key, test1);
            ts.Push(key, test2);
            ts.Push(key, test3);

            // test3 should be current object
            Assert.AreNotEqual(test1, ts.Get <object>(key), "test3 should be current");
            Assert.AreNotEqual(test2, ts.Get <object>(key), "test3 should be current");
            Assert.AreEqual(test3, ts.Get <object>(key), "test3 should be current");

            Assert.AreEqual(test2, ts.Pop <object>(key), "pop should return test2");

            Assert.AreNotEqual(test1, ts.Get <object>(key), "test2 should be current");
            Assert.AreEqual(test2, ts.Get <object>(key), "test2 should be current");
            Assert.AreNotEqual(test3, ts.Get <object>(key), "test2 should be current");

            Assert.AreEqual(test1, ts.Pop <object>(key), "pop should return test1");

            Assert.AreEqual(test1, ts.Get <object>(key), "test1 should be current");
            Assert.AreNotEqual(test2, ts.Get <object>(key), "test1 should be current");
            Assert.AreNotEqual(test3, ts.Get <object>(key), "test1 should be current");

            Assert.AreEqual(null, ts.Pop <object>(key), "pop should return null");

            Assert.IsNull(ts.Get <object>(key), "null should be current");

            Assert.AreEqual(null, ts.Pop <object>(key), "pop with nothing should be null");
            Assert.IsNull(ts.Get <object>(key), "null should be current");
        }