UA-.NETStandard/tests/Opc.Ua.SourceGeneration.Core.Tests/Generators/ClientApiGeneratorTests.cs

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using System;
using System.IO;
using Moq;
using NUnit.Framework;
using Opc.Ua.Schema.Model;

namespace Opc.Ua.SourceGeneration.Generator.Tests
{
    /// <summary>
    /// Unit tests for the ClientApiGenerator class.
    /// </summary>
    [TestFixture]
    [Category("Generator")]
    [SetCulture("en-us")]
    [SetUICulture("en-us")]
    [Parallelizable]
    public class ClientApiGeneratorTests
    {
        private Mock<IFileSystem> m_mockFileSystem;
        private Mock<IModelDesign> m_mockModelDesign;
        private Mock<ITelemetryContext> m_mockTelemetry;
        private GeneratorContext m_context = null!;

        [SetUp]
        public void SetUp()
        {
            m_mockFileSystem = new Mock<IFileSystem>();
            m_mockModelDesign = new Mock<IModelDesign>();
            m_mockTelemetry = new Mock<ITelemetryContext>();

            // Setup default namespace
            var targetNamespace = new Namespace
            {
                Value = "http://test.org/UA/",
                Prefix = "Test",
                Name = "TestNamespace"
            };
            m_mockModelDesign.Setup(m => m.TargetNamespace).Returns(targetNamespace);
            m_mockModelDesign.Setup(m => m.Namespaces).Returns([targetNamespace]);
        }

        /// <summary>
        /// Tests that the constructor throws ArgumentNullException when context is null.
        /// </summary>
        [Test]
        public void Constructor_NullContext_ThrowsArgumentNullException()
        {
            // Arrange
            GeneratorContext? context = null;

            // Act & Assert
            Assert.Throws<ArgumentNullException>(() => new ClientApiGenerator(context!));
        }

        /// <summary>
        /// Tests that constructor creates instance with valid context.
        /// </summary>
        [Test]
        public void Constructor_ValidContext_CreatesInstance()
        {
            // Arrange
            m_context = new GeneratorContext
            {
                FileSystem = m_mockFileSystem.Object,
                OutputFolder = "TestOutput",
                ModelDesign = m_mockModelDesign.Object,
                Telemetry = m_mockTelemetry.Object,
                Options = new GeneratorOptions()
            };

            // Act
            var generator = new ClientApiGenerator(m_context);

            // Assert
            Assert.That(generator, Is.Not.Null);
        }

        /// <summary>
        /// Tests that Emit creates a file even when no services exist.
        /// </summary>
        [Test]
        public void Emit_NoServices_CreatesFileWithoutServiceSets()
        {
            // Arrange
            using var memoryStream = new MemoryStream();

            m_mockModelDesign.Setup(m => m.GetListOfServices(It.IsAny<ServiceCategory[]>())).Returns([]);

            string? capturedPath = null;
            m_mockFileSystem.Setup(fs => fs.OpenWrite(It.IsAny<string>()))
                .Callback<string>(path => capturedPath = path)
                .Returns(memoryStream);

            m_context = new GeneratorContext
            {
                FileSystem = m_mockFileSystem.Object,
                OutputFolder = "C:\\output",
                ModelDesign = m_mockModelDesign.Object,
                Telemetry = m_mockTelemetry.Object,
                Options = new GeneratorOptions()
            };

            var generator = new ClientApiGenerator(m_context);

            // Act
            generator.Emit();

            // Assert
            Assert.That(capturedPath, Is.Not.Null);
            Assert.That(capturedPath, Does.Contain("Opc.Ua.Client.g.cs"));
            Assert.That(capturedPath, Does.StartWith("C:\\output"));
            m_mockFileSystem.Verify(fs => fs.OpenWrite(It.IsAny<string>()), Times.Once);
        }

        /// <summary>
        /// Tests that Emit creates a file with the correct name when services exist.
        /// </summary>
        [Test]
        public void Emit_WithServices_CreatesFileWithCorrectName()
        {
            // Arrange
            using var memoryStream = new MemoryStream();

            var requestType = new DataTypeDesign
            {
                SymbolicId = new System.Xml.XmlQualifiedName("TestRequest", "http://test.org/UA/"),
                SymbolicName = new System.Xml.XmlQualifiedName("TestRequest", "http://test.org/UA/")
            };

            var responseType = new DataTypeDesign
            {
                SymbolicId = new System.Xml.XmlQualifiedName("TestResponse", "http://test.org/UA/"),
                SymbolicName = new System.Xml.XmlQualifiedName("TestResponse", "http://test.org/UA/")
            };

            var service = new Service
            {
                Name = "Test",
                Category = ServiceCategory.Session,
                Request = requestType,
                Response = responseType
            };

            m_mockModelDesign.Setup(m => m.GetListOfServices(It.IsAny<ServiceCategory[]>()))
                .Returns([service]);

            string? capturedPath = null;
            m_mockFileSystem.Setup(fs => fs.OpenWrite(It.IsAny<string>()))
                .Callback<string>(path => capturedPath = path)
                .Returns(memoryStream);

            m_context = new GeneratorContext
            {
                FileSystem = m_mockFileSystem.Object,
                OutputFolder = "C:\\output",
                ModelDesign = m_mockModelDesign.Object,
                Telemetry = m_mockTelemetry.Object,
                Options = new GeneratorOptions()
            };

            var generator = new ClientApiGenerator(m_context);

            // Act
            generator.Emit();

            // Assert
            Assert.That(capturedPath, Is.Not.Null);
            Assert.That(capturedPath, Does.Contain("Opc.Ua.Client.g.cs"));
            Assert.That(capturedPath, Does.StartWith("C:\\output"));
            m_mockFileSystem.Verify(fs => fs.OpenWrite(It.IsAny<string>()), Times.Once);
        }

        /// <summary>
        /// Tests that Emit handles empty output folder correctly.
        /// </summary>
        [Test]
        public void Emit_EmptyOutputFolder_CreatesFileInCurrentDirectory()
        {
            // Arrange
            using var memoryStream = new MemoryStream();

            m_mockModelDesign.Setup(m => m.GetListOfServices(It.IsAny<ServiceCategory[]>())).Returns([]);

            string? capturedPath = null;
            m_mockFileSystem.Setup(fs => fs.OpenWrite(It.IsAny<string>()))
                .Callback<string>(path => capturedPath = path)
                .Returns(memoryStream);

            m_context = new GeneratorContext
            {
                FileSystem = m_mockFileSystem.Object,
                OutputFolder = string.Empty,
                ModelDesign = m_mockModelDesign.Object,
                Telemetry = m_mockTelemetry.Object,
                Options = new GeneratorOptions()
            };

            var generator = new ClientApiGenerator(m_context);

            // Act
            generator.Emit();

            // Assert
            Assert.That(capturedPath, Is.Not.Null);
            Assert.That(capturedPath, Does.Contain("Opc.Ua.Client.g.cs"));
            m_mockFileSystem.Verify(fs => fs.OpenWrite(It.IsAny<string>()), Times.Once);
        }
    }
}