Implement dotnet test help option

src/Cli/dotnet/commands/dotnet-test/CliConstants.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Microsoft.DotNet.Cli
+{
+    internal static class CliConstants
+    {
+        public const string HelpOptionKey = "--help";
+        public const string MSBuildOptionKey = "--msbuild-params";
+        public const string NoBuildOptionKey = "--no-build";
+        public const string ServerOptionKey = "--server";
+        public const string DotNetTestPipeOptionKey = "--dotnet-test-pipe";
+
+        public const string ServerOptionValue = "dotnettestcli";
+
+        public const string MSBuildExeName = "MSBuild.dll";
+
+    }
+}

src/Cli/dotnet/commands/dotnet-test/CustomEventArgs.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.DotNet.Tools.Test;
+
+namespace Microsoft.DotNet.Cli
+{
+    internal class ErrorEventArgs : EventArgs
+    {
+        public string ErrorMessage { get; set; }
+    }
+
+    internal class HelpEventArgs : EventArgs
+    {
+        public CommandLineOptionMessages CommandLineOptionMessages { get; set; }
+    }
+}

src/Cli/dotnet/commands/dotnet-test/IPC/IClient.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Microsoft.DotNet.Tools.Test;
+
+internal interface IClient :
+#if NETCOREAPP
+IAsyncDisposable,
+#endif
+IDisposable
+{
+    bool IsConnected { get; }
+
+    Task ConnectAsync(CancellationToken cancellationToken);
+
+    Task<TResponse> RequestReplyAsync<TRequest, TResponse>(TRequest request, CancellationToken cancellationToken)
+        where TRequest : IRequest
+        where TResponse : IResponse;
+}

src/Cli/dotnet/commands/dotnet-test/IPC/INamedPipeBase.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Microsoft.DotNet.Tools.Test;
+
+internal interface INamedPipeBase
+{
+    void RegisterSerializer(INamedPipeSerializer namedPipeSerializer, Type type);
+}

src/Cli/dotnet/commands/dotnet-test/IPC/INamedPipeSerializer.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Microsoft.DotNet.Tools.Test;
+
+internal interface INamedPipeSerializer
+{
+    int Id { get; }
+
+    void Serialize(object objectToSerialize, Stream stream);
+
+    object Deserialize(Stream stream);
+}

src/Cli/dotnet/commands/dotnet-test/IPC/IRequest.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Microsoft.DotNet.Tools.Test;
+
+internal interface IRequest
+{
+}

src/Cli/dotnet/commands/dotnet-test/IPC/IResponse.cs

@@ -0,0 +1,8 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Microsoft.DotNet.Tools.Test;
+
+internal interface IResponse
+{
+}

src/Cli/dotnet/commands/dotnet-test/IPC/IServer.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Microsoft.DotNet.Tools.Test;
+
+internal interface IServer : INamedPipeBase,
+#if NETCOREAPP
+IAsyncDisposable,
+#endif
+IDisposable
+{
+    PipeNameDescription PipeName { get; }
+
+    Task WaitConnectionAsync(CancellationToken cancellationToken);
+}

src/Cli/dotnet/commands/dotnet-test/IPC/Models/CommandLineOptionMessages.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Microsoft.DotNet.Tools.Test
+{
+    internal sealed record CommandLineOptionMessage(string Name, string Description, bool IsHidden, bool IsBuiltIn) : IRequest;
+
+    internal sealed record CommandLineOptionMessages(string ModulePath, CommandLineOptionMessage[] CommandLineOptionMessageList) : IRequest;
+}

src/Cli/dotnet/commands/dotnet-test/IPC/Models/Module.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Microsoft.DotNet.Tools.Test;
+
+internal sealed record class Module(string DLLPath, string ProjectPath) : IRequest;

src/Cli/dotnet/commands/dotnet-test/IPC/Models/VoidResponse.cs

@@ -0,0 +1,9 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+namespace Microsoft.DotNet.Tools.Test;
+
+internal sealed class VoidResponse : IResponse
+{
+    public static readonly VoidResponse CachedInstance = new();
+}

src/Cli/dotnet/commands/dotnet-test/IPC/NamedPipeBase.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+#pragma warning disable IDE0240 // Remove redundant nullable directive
+#nullable disable
+#pragma warning restore IDE0240 // Remove redundant nullable directive
+
+using System.Globalization;
+
+namespace Microsoft.DotNet.Tools.Test;
+
+internal abstract class NamedPipeBase
+{
+    private readonly Dictionary<Type, object> _typeSerializer = [];
+    private readonly Dictionary<int, object> _idSerializer = [];
+
+    public void RegisterSerializer(INamedPipeSerializer namedPipeSerializer, Type type)
+    {
+        _typeSerializer.Add(type, namedPipeSerializer);
+        _idSerializer.Add(namedPipeSerializer.Id, namedPipeSerializer);
+    }
+
+    protected INamedPipeSerializer GetSerializer(int id)
+        => _idSerializer.TryGetValue(id, out object serializer)
+            ? (INamedPipeSerializer)serializer
+            : throw new ArgumentException((string.Format(
+                CultureInfo.InvariantCulture,
+#if dotnet
+                 LocalizableStrings.NoSerializerRegisteredWithIdErrorMessage,
+#else
+                "No serializer registered with ID '{0}'",
+#endif
+                id)));
+
+    protected INamedPipeSerializer GetSerializer(Type type)
+        => _typeSerializer.TryGetValue(type, out object serializer)
+            ? (INamedPipeSerializer)serializer
+            : throw new ArgumentException(string.Format(
+                CultureInfo.InvariantCulture,
+#if dotnet
+                 LocalizableStrings.NoSerializerRegisteredWithTypeErrorMessage,
+#else
+                "No serializer registered with type '{0}'",
+#endif
+                type));
+}