Add XML documentation across gateway, worker, and .NET client

src/MxGateway.Tests/Gateway/GatewayEndToEndFakeWorkerSmokeTests.cs

@@ -21,6 +21,9 @@ public sealed class GatewayEndToEndFakeWorkerSmokeTests
     private const int ServerHandle = 1001;
     private const int ItemHandle = 2002;
 
+    /// <summary>
+    /// Verifies gateway session lifecycle with a scripted fake worker: open, command, event, close.
+    /// </summary>
     [Fact]
     public async Task GatewayService_WithFakeWorker_CompletesSessionCommandEventAndClosePath()
     {
@@ -146,6 +149,10 @@ public sealed class GatewayEndToEndFakeWorkerSmokeTests
         private readonly GatewayMetrics _metrics = new();
         private readonly SessionRegistry _registry = new();
 
+        /// <summary>
+        /// Initializes a new instance of <see cref="GatewayServiceFixture"/>.
+        /// </summary>
+        /// <param name="launcher">Worker process launcher for the fixture.</param>
         public GatewayServiceFixture(IWorkerProcessLauncher launcher)
         {
             IOptions<GatewayOptions> options = Options.Create(CreateOptions());
@@ -178,8 +185,14 @@ public sealed class GatewayEndToEndFakeWorkerSmokeTests
                 NullLogger<MxAccessGatewayService>.Instance);
         }
 
+        /// <summary>
+        /// Gets the configured gateway service instance.
+        /// </summary>
         public MxAccessGatewayService Service { get; }
 
+        /// <summary>
+        /// Disposes all active sessions and metrics.
+        /// </summary>
         public async ValueTask DisposeAsync()
         {
             foreach (GatewaySession session in _registry.Snapshot())
@@ -220,12 +233,27 @@ public sealed class GatewayEndToEndFakeWorkerSmokeTests
         public const int ProcessId = 4680;
         private readonly ConcurrentQueue<MxCommandKind> _commandKinds = new();
 
+        /// <summary>
+        /// Gets the fake worker process instance.
+        /// </summary>
         public FakeWorkerProcess Process { get; } = new(ProcessId);
 
+        /// <summary>
+        /// Gets the collection of command kinds processed by the worker.
+        /// </summary>
         public IReadOnlyCollection<MxCommandKind> CommandKinds => _commandKinds.ToArray();
 
+        /// <summary>
+        /// Gets the worker's asynchronous task.
+        /// </summary>
         public Task WorkerTask { get; private set; } = Task.CompletedTask;
 
+        /// <summary>
+        /// Launches a new worker process and returns a handle to manage it.
+        /// </summary>
+        /// <param name="request">Worker process launch request parameters.</param>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        /// <returns>Worker process handle.</returns>
         public Task<WorkerProcessHandle> LaunchAsync(
             WorkerProcessLaunchRequest request,
             CancellationToken cancellationToken = default)
@@ -321,12 +349,26 @@ public sealed class GatewayEndToEndFakeWorkerSmokeTests
 
     private sealed class FakeWorkerProcess(int processId) : IWorkerProcess
     {
+        /// <summary>
+        /// Gets the process identifier.
+        /// </summary>
         public int Id { get; } = processId;
 
+        /// <summary>
+        /// Gets a value indicating whether the process has exited.
+        /// </summary>
         public bool HasExited { get; private set; }
 
+        /// <summary>
+        /// Gets the exit code of the process.
+        /// </summary>
         public int? ExitCode { get; private set; }
 
+        /// <summary>
+        /// Waits for the process to exit asynchronously.
+        /// </summary>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        /// <returns>Completed task.</returns>
         public ValueTask WaitForExitAsync(CancellationToken cancellationToken)
         {
             HasExited = true;
@@ -334,15 +376,26 @@ public sealed class GatewayEndToEndFakeWorkerSmokeTests
             return ValueTask.CompletedTask;
         }
 
+        /// <summary>
+        /// Terminates the process.
+        /// </summary>
+        /// <param name="entireProcessTree">Whether to kill the entire process tree.</param>
         public void Kill(bool entireProcessTree)
         {
             MarkExited(-1);
         }
 
+        /// <summary>
+        /// Releases resources used by this process.
+        /// </summary>
         public void Dispose()
         {
         }
 
+        /// <summary>
+        /// Marks the process as exited with the specified exit code.
+        /// </summary>
+        /// <param name="exitCode">The process exit code.</param>
         public void MarkExited(int exitCode)
         {
             HasExited = true;
@@ -356,6 +409,9 @@ public sealed class GatewayEndToEndFakeWorkerSmokeTests
         private readonly TaskCompletionSource<T> _firstMessage = new(TaskCreationOptions.RunContinuationsAsynchronously);
         private readonly List<T> _messages = [];
 
+        /// <summary>
+        /// Gets the recorded messages written to this stream.
+        /// </summary>
         public IReadOnlyList<T> Messages
         {
             get
@@ -367,8 +423,16 @@ public sealed class GatewayEndToEndFakeWorkerSmokeTests
             }
         }
 
+        /// <summary>
+        /// Gets or sets options for writing messages to the stream.
+        /// </summary>
         public WriteOptions? WriteOptions { get; set; }
 
+        /// <summary>
+        /// Writes a message to the stream asynchronously.
+        /// </summary>
+        /// <param name="message">The message to write.</param>
+        /// <returns>Completed task.</returns>
         public Task WriteAsync(T message)
         {
             lock (_syncRoot)
@@ -380,6 +444,11 @@ public sealed class GatewayEndToEndFakeWorkerSmokeTests
             return Task.CompletedTask;
         }
 
+        /// <summary>
+        /// Waits for the first message to be written within the specified timeout.
+        /// </summary>
+        /// <param name="timeout">Maximum time to wait for the first message.</param>
+        /// <returns>The first message written to this stream.</returns>
         public async Task<T> WaitForFirstMessageAsync(TimeSpan timeout)
         {
             return await _firstMessage.Task.WaitAsync(timeout).ConfigureAwait(false);
@@ -394,43 +463,66 @@ public sealed class GatewayEndToEndFakeWorkerSmokeTests
         private Status _status;
         private WriteOptions? _writeOptions;
 
+        /// <inheritdoc />
         protected override string MethodCore => "/mxaccess_gateway.v1.MxAccessGateway/Test";
 
+        /// <inheritdoc />
         protected override string HostCore => "localhost";
 
+        /// <inheritdoc />
         protected override string PeerCore => "ipv4:127.0.0.1:5000";
 
+        /// <inheritdoc />
         protected override DateTime DeadlineCore => DateTime.UtcNow.AddMinutes(1);
 
+        /// <inheritdoc />
         protected override Metadata RequestHeadersCore => _requestHeaders;
 
+        /// <inheritdoc />
         protected override CancellationToken CancellationTokenCore => cancellationToken;
 
+        /// <inheritdoc />
         protected override Metadata ResponseTrailersCore => _responseTrailers;
 
+        /// <inheritdoc />
         protected override Status StatusCore
         {
             get => _status;
             set => _status = value;
         }
 
+        /// <inheritdoc />
         protected override WriteOptions? WriteOptionsCore
         {
             get => _writeOptions;
             set => _writeOptions = value;
         }
 
+        /// <inheritdoc />
         protected override AuthContext AuthContextCore { get; } = new(
             string.Empty,
             new Dictionary<string, List<AuthProperty>>(StringComparer.Ordinal));
 
+        /// <inheritdoc />
         protected override IDictionary<object, object> UserStateCore => _userState;
 
+        /// <summary>
+        /// Writes response headers asynchronously.
+        /// </summary>
+        /// <param name="responseHeaders">Headers to write.</param>
+        /// <returns>Completed task.</returns>
+        /// <inheritdoc />
         protected override Task WriteResponseHeadersAsyncCore(Metadata responseHeaders)
         {
             return Task.CompletedTask;
         }
 
+        /// <summary>
+        /// Creates a context propagation token with the specified options.
+        /// </summary>
+        /// <param name="options">Propagation options.</param>
+        /// <returns>Propagation token.</returns>
+        /// <inheritdoc />
         protected override ContextPropagationToken CreatePropagationTokenCore(
             ContextPropagationOptions? options)
         {