c# - 在同一解决方案中针对服务器运行集成测试

Question

我使用 NUnit/MSTest 编写集成测试，只是因为它更容易。测试需要与同一解决方案中的 TCP 服务器通信，并且它希望同时调试测试和 TCP 服务器。有没有办法在 Debug模式下从解决方案启动项目(控制台应用程序)并同时调试测试方法？无论我尝试过什么，VS 都不允许。

Answer 1

这是编写集成测试时的常见场景。集成测试依赖于另一个服务的启动和运行。为了处理它，我通常调用进程来启动，例如同一解决方案中的 ConsoleApplication 项目。只需添加一个帮助程序类即可调用该流程。

internal class ProcessInvoker
{
    /// <summary>
    /// Invokes the host process for test service
    /// </summary>
    public static void InvokeDummyService()
    {
        var path = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);

        ProcessStartInfo info = new ProcessStartInfo(Path.Combine(path, "DummyService.exe"));

        info.UseShellExecute = true;
        info.WorkingDirectory = path;

        var process = Process.Start(info);
    }

    /// <summary>
    /// Kills the process of service host
    /// </summary>
    public static void KillDummyService()
    {
        Process.GetProcessesByName("DummyService").ToList().ForEach(x => x.Kill());
    }
}

现在在 TestInitialize 和 TestCleanup 方法中，我将启动进程并终止相应的进程。

    /// <summary>
    /// Setup required before the tests of the fixture will run.
    /// </summary>
    [TestFixtureSetUp]
    public void Init()
    {
        ProcessInvoker.InvokeDummyService();
    }

    /// <summary>
    /// Tear down to perform clean when the execution is finished.
    /// </summary>
    [TestFixtureTearDown]
    public void TearDown()
    {
        ProcessInvoker.KillDummyService();
    }

现在，来附加此过程以进行调试的部分。这是一个非常棘手的问题。我找到了一个 VS Addin从 Visual Studio 团队自动附加子进程到当前调试器，但它似乎只适用于“f5”调试。

然后我找到this SO post它真的很有效。我在此处发布了完整的代码形式的答案，几乎没有定制:

using System;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using System.Linq;
using System.Collections.Generic;
using EnvDTE;

namespace Common
{

    [ComImport, Guid("00000016-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IOleMessageFilter
    {
        [PreserveSig]
        int HandleInComingCall(int dwCallType, IntPtr hTaskCaller, int dwTickCount, IntPtr lpInterfaceInfo);

        [PreserveSig]
        int RetryRejectedCall(IntPtr hTaskCallee, int dwTickCount, int dwRejectType);

        [PreserveSig]
        int MessagePending(IntPtr hTaskCallee, int dwTickCount, int dwPendingType);
    }

    public class MessageFilter : IOleMessageFilter
    {
        private const int Handled = 0, RetryAllowed = 2, Retry = 99, Cancel = -1, WaitAndDispatch = 2;

        int IOleMessageFilter.HandleInComingCall(int dwCallType, IntPtr hTaskCaller, int dwTickCount, IntPtr lpInterfaceInfo)
        {
            return Handled;
        }

        int IOleMessageFilter.RetryRejectedCall(IntPtr hTaskCallee, int dwTickCount, int dwRejectType)
        {
            return dwRejectType == RetryAllowed ? Retry : Cancel;
        }

        int IOleMessageFilter.MessagePending(IntPtr hTaskCallee, int dwTickCount, int dwPendingType)
        {
            return WaitAndDispatch;
        }

        public static void Register()
        {
            CoRegisterMessageFilter(new MessageFilter());
        }

        public static void Revoke()
        {
            CoRegisterMessageFilter(null);
        }

        private static void CoRegisterMessageFilter(IOleMessageFilter newFilter)
        {
            IOleMessageFilter oldFilter;
            CoRegisterMessageFilter(newFilter, out oldFilter);
        }

        [DllImport("Ole32.dll")]
        private static extern int CoRegisterMessageFilter(IOleMessageFilter newFilter, out IOleMessageFilter oldFilter);
    }

    public static class AttachDebugger
    {
        public static void ToProcess(int processId)
        {
            MessageFilter.Register();
            var process = GetProcess(processId);
            if (process != null)
            {
                process.Attach();
                Console.WriteLine("Attached to {0}", process.Name);
            }
            MessageFilter.Revoke();
        }
        private static Process GetProcess(int processID)
        {
            var dte = (DTE)Marshal.GetActiveObject("VisualStudio.DTE.12.0");
            var processes = dte.Debugger.LocalProcesses.OfType<Process>();
            return processes.SingleOrDefault(x => x.ProcessID == processID);
        }
    }
}

注意:您需要从 AddReference -> Extentions 添加 VS 自动化库 EnvDTE

现在在 ProcessInvoker 类中，在进程启动语句之后添加对 AttachDebugger 实用程序类的调用。

var process = Process.Start(info);
// Add this after invoking process.
AttachDebugger.ToProcess(process.Id);

当我启动调试测试时，它非常有效。该进程被调用，附加到 VS 并且能够调试其他进程代码。

检查工作解决方案 here .特别WcfDynamicProxy.Tests在解决方案中。我在那里使用 Nunit 编写集成测试。