Issue #22: implement pipe client and frame protocol

src/MxGateway.Worker.Tests/Bootstrap/WorkerApplicationTests.cs

@@ -1,6 +1,9 @@
 using System;
+using System.Threading;
+using System.Threading.Tasks;
 using MxGateway.Contracts;
 using MxGateway.Worker.Bootstrap;
+using MxGateway.Worker.Ipc;
 
 namespace MxGateway.Worker.Tests.Bootstrap;
 
@@ -15,16 +18,19 @@ public sealed class WorkerApplicationTests
         int exitCode = MxGateway.Worker.WorkerApplication.Run(
             ValidArgs(),
             environment,
-            logger);
+            logger,
+            new SucceedingPipeClient());
 
         Assert.Equal((int)WorkerExitCode.Success, exitCode);
-        MemoryWorkerLogEntry entry = Assert.Single(logger.Entries);
+        Assert.Equal(2, logger.Entries.Count);
+        MemoryWorkerLogEntry entry = logger.Entries[0];
         Assert.Equal("Information", entry.Level);
         Assert.Equal("WorkerBootstrapSucceeded", entry.EventName);
         Assert.Equal("session-1", entry.Fields["session_id"]);
         Assert.Equal("mxaccess-gateway-123-session-1", entry.Fields["pipe_name"]);
         Assert.Equal(GatewayContractInfo.WorkerProtocolVersion, entry.Fields["protocol_version"]);
         Assert.Equal("[redacted]", entry.Fields["nonce"]);
+        Assert.Equal("WorkerPipeHandshakeSucceeded", logger.Entries[1].EventName);
     }
 
     [Fact]
@@ -73,6 +79,24 @@ public sealed class WorkerApplicationTests
         Assert.Equal((int)WorkerExitCode.MissingNonce, exitCode);
     }
 
+    [Fact]
+    public void Run_WithPipeProtocolFailure_ReturnsProtocolViolation()
+    {
+        MemoryWorkerEnvironment environment = CreateEnvironment("nonce-secret");
+        MemoryWorkerLogger logger = new();
+
+        int exitCode = MxGateway.Worker.WorkerApplication.Run(
+            ValidArgs(),
+            environment,
+            logger,
+            new ThrowingPipeClient(new WorkerFrameProtocolException(
+                WorkerFrameProtocolErrorCode.NonceMismatch,
+                "Bad nonce.")));
+
+        Assert.Equal((int)WorkerExitCode.ProtocolViolation, exitCode);
+        Assert.Equal("WorkerPipeProtocolFailure", logger.Entries[1].EventName);
+    }
+
     [Fact]
     public void Run_WithUnexpectedBootstrapFailure_ReturnsUnexpectedFailure()
     {
@@ -110,4 +134,31 @@ public sealed class WorkerApplicationTests
         environment.Set(WorkerOptions.NonceEnvironmentVariableName, nonce);
         return environment;
     }
+
+    private sealed class SucceedingPipeClient : IWorkerPipeClient
+    {
+        public Task RunAsync(
+            WorkerOptions options,
+            CancellationToken cancellationToken = default)
+        {
+            return Task.CompletedTask;
+        }
+    }
+
+    private sealed class ThrowingPipeClient : IWorkerPipeClient
+    {
+        private readonly Exception _exception;
+
+        public ThrowingPipeClient(Exception exception)
+        {
+            _exception = exception;
+        }
+
+        public Task RunAsync(
+            WorkerOptions options,
+            CancellationToken cancellationToken = default)
+        {
+            throw _exception;
+        }
+    }
 }