UA-.NETStandard/Tests/Opc.Ua.Core.Tests/Stack/Server/RequestLifetimeTests.cs

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// CA2000: test code; many disposables are ownership-transferred to test fixtures or short-lived,
// making CA2000 noisy without a real leak risk. Disabled file-level for the suite.
#pragma warning disable CA2000
using System.Threading;
using NUnit.Framework;

namespace Opc.Ua.Core.Tests.Stack.Server
{
    [TestFixture]
    [Category("Server")]
    [SetCulture("en-us")]
    [SetUICulture("en-us")]
    [Parallelizable]
    public class RequestLifetimeTests
    {
        [Test]
        public void Constructor_Default_CreatesInstance()
        {
            using var lifetime = new RequestLifetime();

            Assert.That(lifetime.CancellationToken.IsCancellationRequested, Is.False);
            Assert.That(lifetime.StatusCode, Is.EqualTo(StatusCodes.Good));
        }

        [Test]
        public void Constructor_WithExternalToken_CreatesLinkedTokenSource()
        {
            using var cts = new CancellationTokenSource();
            using var lifetime = new RequestLifetime(cts.Token);

            Assert.That(lifetime.CancellationToken.IsCancellationRequested, Is.False);

            cts.Cancel();

            Assert.That(lifetime.CancellationToken.IsCancellationRequested, Is.True);
            Assert.That(lifetime.StatusCode, Is.EqualTo(StatusCodes.Good));
        }

        [Test]
        public void TryCancel_WhenNotCancelled_ReturnsTrue_SetsStatusCode_CancelsToken()
        {
            using var lifetime = new RequestLifetime();

            bool result = lifetime.TryCancel(StatusCodes.BadTimeout);

            Assert.That(result, Is.True);
            Assert.That(lifetime.CancellationToken.IsCancellationRequested, Is.True);
            Assert.That(lifetime.StatusCode, Is.EqualTo(StatusCodes.BadTimeout));
        }

        [Test]
        public void TryCancel_WhenAlreadyCancelled_ReturnsFalse_LeavesStatusCode()
        {
            using var lifetime = new RequestLifetime();

            bool firstResult = lifetime.TryCancel(StatusCodes.BadTimeout);
            bool secondResult = lifetime.TryCancel(StatusCodes.BadUnexpectedError);

            Assert.That(firstResult, Is.True);
            Assert.That(secondResult, Is.False);
            Assert.That(lifetime.StatusCode, Is.EqualTo(StatusCodes.BadTimeout));
            Assert.That(lifetime.CancellationToken.IsCancellationRequested, Is.True);
        }

        [Test]
        public void TryCancel_AfterDispose_ReturnsFalse()
        {
            var lifetime = new RequestLifetime();
            lifetime.Dispose();

            bool result = lifetime.TryCancel(StatusCodes.BadTimeout);

            Assert.That(result, Is.False);
            Assert.That(lifetime.CancellationToken.IsCancellationRequested, Is.False);
        }

        [Test]
        public void MarkCompleted_DisposesToken_CannotCancel()
        {
            var lifetime = new RequestLifetime();
            lifetime.MarkCompleted();

            bool result = lifetime.TryCancel(StatusCodes.BadTimeout);

            Assert.That(result, Is.False);

            Assert.That(lifetime.CancellationToken.IsCancellationRequested, Is.False);
        }

        [Test]
        public void None_Property_ReturnsCompletedInstance()
        {
            RequestLifetime lifetime = RequestLifetime.None;

            Assert.That(lifetime.StatusCode, Is.EqualTo(StatusCodes.Good));

            bool result = lifetime.TryCancel(StatusCodes.BadTimeout);

            Assert.That(result, Is.False);

            Assert.That(lifetime.CancellationToken.IsCancellationRequested, Is.False);
        }
    }
}