UA-.NETStandard/Tests/Opc.Ua.Client.Tests/FileSystem/FileSystemErrorsTests.cs

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using System;
using System.IO;
using NUnit.Framework;
using Opc.Ua.Client.FileSystem;

namespace Opc.Ua.Client.Tests.FileSystem
{
    /// <summary>
    /// Unit tests for the internal <c>FileSystemErrors</c> mapper.
    /// </summary>
    [TestFixture]
    [Category("FileSystem")]
    [Parallelizable]
    public class FileSystemErrorsTests
    {
        [Test]
        public void BadNoMatchOnDirectoryReturnsDirectoryNotFoundException()
        {
            var ex = new ServiceResultException(StatusCodes.BadNoMatch);
            Exception mapped = FileSystemErrors.Translate(ex, "/foo/bar", targetIsDirectory: true);
            Assert.That(mapped, Is.InstanceOf<DirectoryNotFoundException>());
            Assert.That(mapped.Message, Does.Contain("/foo/bar"));
            Assert.That(mapped.InnerException, Is.SameAs(ex));
        }

        [Test]
        public void BadNoMatchOnFileReturnsFileNotFoundException()
        {
            var ex = new ServiceResultException(StatusCodes.BadNoMatch);
            Exception mapped = FileSystemErrors.Translate(ex, "/foo/bar.txt", targetIsDirectory: false);
            Assert.That(mapped, Is.InstanceOf<FileNotFoundException>());
            Assert.That(((FileNotFoundException)mapped).FileName, Is.EqualTo("/foo/bar.txt"));
        }

        [Test]
        public void BadNotFoundMapsToNotFound()
        {
            var ex = new ServiceResultException(StatusCodes.BadNotFound);
            Exception mapped = FileSystemErrors.Translate(ex, "/x", targetIsDirectory: false);
            Assert.That(mapped, Is.InstanceOf<FileNotFoundException>());
        }

        [Test]
        public void BadNodeIdUnknownMapsToNotFound()
        {
            var ex = new ServiceResultException(StatusCodes.BadNodeIdUnknown);
            Exception mapped = FileSystemErrors.Translate(ex, "/x", targetIsDirectory: true);
            Assert.That(mapped, Is.InstanceOf<DirectoryNotFoundException>());
        }

        [Test]
        public void BadBrowseNameDuplicatedMapsToIOException()
        {
            var ex = new ServiceResultException(StatusCodes.BadBrowseNameDuplicated);
            Exception mapped = FileSystemErrors.Translate(ex, "/foo", targetIsDirectory: false);
            Assert.That(mapped, Is.InstanceOf<IOException>());
            Assert.That(mapped.Message, Does.Contain("already exists"));
        }

        [Test]
        public void BadUserAccessDeniedMapsToUnauthorizedAccessException()
        {
            var ex = new ServiceResultException(StatusCodes.BadUserAccessDenied);
            Exception mapped = FileSystemErrors.Translate(ex, "/foo", targetIsDirectory: false);
            Assert.That(mapped, Is.InstanceOf<UnauthorizedAccessException>());
            Assert.That(mapped.Message, Does.Contain("access denied"));
        }

        [Test]
        public void BadNotWritableMapsToUnauthorizedAccessException()
        {
            var ex = new ServiceResultException(StatusCodes.BadNotWritable);
            Exception mapped = FileSystemErrors.Translate(ex, "/foo", targetIsDirectory: false);
            Assert.That(mapped, Is.InstanceOf<UnauthorizedAccessException>());
        }

        [Test]
        public void BadResourceUnavailableMapsToIOExceptionNotUnauthorized()
        {
            var ex = new ServiceResultException(StatusCodes.BadResourceUnavailable);
            Exception mapped = FileSystemErrors.Translate(ex, "/foo", targetIsDirectory: false);
            Assert.That(mapped, Is.InstanceOf<IOException>());
            Assert.That(mapped, Is.Not.InstanceOf<UnauthorizedAccessException>());
        }

        [Test]
        public void BadInvalidStateMapsToIOException()
        {
            var ex = new ServiceResultException(StatusCodes.BadInvalidState);
            Exception mapped = FileSystemErrors.Translate(ex, "/foo", targetIsDirectory: false);
            Assert.That(mapped, Is.InstanceOf<IOException>());
        }

        [Test]
        public void UnmappedStatusCodePassesThroughOriginalException()
        {
            var ex = new ServiceResultException(StatusCodes.BadInternalError);
            Exception mapped = FileSystemErrors.Translate(ex, "/foo", targetIsDirectory: false);
            Assert.That(mapped, Is.SameAs(ex));
        }

        [Test]
        public void NotFoundFactoryReturnsCorrectExceptionType()
        {
            Exception fileException = FileSystemErrors.NotFound("/x.txt", targetIsDirectory: false);
            Exception dirException = FileSystemErrors.NotFound("/x", targetIsDirectory: true);
            Assert.That(fileException, Is.InstanceOf<FileNotFoundException>());
            Assert.That(((FileNotFoundException)fileException).FileName, Is.EqualTo("/x.txt"));
            Assert.That(dirException, Is.InstanceOf<DirectoryNotFoundException>());
        }

        [Test]
        public void AmbiguousFactoryReturnsIOExceptionWithCount()
        {
            IOException ex = FileSystemErrors.Ambiguous("/foo", 3);
            Assert.That(ex.Message, Does.Contain("ambiguous"));
            Assert.That(ex.Message, Does.Contain("3"));
            Assert.That(ex.Message, Does.Contain("/foo"));
        }

        [Test]
        public void TranslateNullExceptionThrowsArgumentNullException()
        {
            Assert.Throws<ArgumentNullException>(
                () => FileSystemErrors.Translate(null!, "/x", false));
        }
    }
}