Umbraco-CMS/tests/Umbraco.Tests.UnitTests/Umbraco.Core/Collections/StackQueueTests.cs

using NUnit.Framework;
using Umbraco.Core.Collections;

namespace Umbraco.Cms.Tests.UnitTests.Umbraco.Core.Collections
{
    [TestFixture]
    public class StackQueueTests
    {
        [Test]
        public void Queue()
        {
            var sq = new StackQueue<int>();
            for (var i = 0; i < 3; i++)
            {
                sq.Enqueue(i);
            }

            var expected = 0;
            while (sq.Count > 0)
            {
                var next = sq.Dequeue();
                Assert.AreEqual(expected, next);
                expected++;
            }
        }

        [Test]
        public void Stack()
        {
            var sq = new StackQueue<int>();
            for (var i = 0; i < 3; i++)
            {
                sq.Push(i);
            }

            var expected = 2;
            while (sq.Count > 0)
            {
                var next = sq.Pop();
                Assert.AreEqual(expected, next);
                expected--;
            }
        }

        [Test]
        public void Stack_And_Queue()
        {
            var sq = new StackQueue<int>();
            for (var i = 0; i < 5; i++)
            {
                if (i % 2 == 0)
                {
                    sq.Push(i);
                }
                else
                {
                    sq.Enqueue(i);
                }
            }

            // 4 (push)
            // 3 (enqueue)
            // 2 (push)
            // 1 (enqueue)
            // 0 (push)

            Assert.AreEqual(4, sq.Pop());
            Assert.AreEqual(0, sq.Dequeue());
            Assert.AreEqual(3, sq.Pop());
            Assert.AreEqual(1, sq.Dequeue());
            Assert.AreEqual(2, sq.Pop());
        }
    }
}