c# - 如何配置 Moq 以使用通用 action

Question

我有一个使用 WCF 客户端代理的外观类。为了防止带有 IDispose 的 WCF 代理客户端出现问题(WCF 中的错误，MS 仍未修复)，我创建了一个通用代理服务来执行调用 WCF 服务的基本管道。

我想使用 Moq 对外观进行单元测试，但我遇到了如何使用 Moq 在单元测试中进入特定调用的问题。单元测试想要验证对进程管理器的调用只完成了一次，但代码没有在“使用”方法中流动....

---

(编辑)为了完整起见，这里是解决问题的部分:

public AuthenticationFacade CreateSut()
        {
            ProcessManager = new Mock<IProcessManager>().Object;
            SessionWrapper = new Mock<ISessionWrapper>().Object;

            AuthenticationClientProxy = new Mock<Action<IAuthentication>>().Object;

            var authenticationProxyServiceMock = new Mock<IProxyService<IAuthentication>>();

            Mock<IAuthentication> mockAuthentication = new Mock<IAuthentication>();
            authenticationProxyServiceMock.Setup(aps => aps.Use(It.IsAny<Action<IAuthentication>>()))
                          .Callback<Action<IAuthentication>>(ac => ac(mockAuthentication.Object));

            AuthenticationProxyService = authenticationProxyServiceMock.Object;

            return new AuthenticationFacade(ProcessManager, SessionWrapper, AuthenticationProxyService);
        }

---

(引用代码)

代码第 1 部分:

    using System;

    namespace Progis.Kim
    {
        public interface IProxyService<T>
        {
            void Use(Action<T> action);
        }
    }

代码第 2 部分:

/// <summary>
    /// Helper class to fix the WCF Client Proxy usage bug with IDispose.
    /// Check: http://benmccallum.wordpress.com/2011/08/27/wcf-web-service-wrapper-closing-disposing-and-aborting-best-practices/
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class ProxyService<T> : IProxyService<T>
    {
        public void Use(Action<T> action)
        {
            <cut>....
        }
    }

代码第 3 部分:

public class AuthenticationFacade : IAuthenticationFacade
    {
        private readonly IProcessManager processManager;
        private readonly ISessionWrapper sessionWrapper;
        private readonly IProxyService<IAuthentication> authenticationProxyService;

        public AuthenticationFacade(
            IProcessManager processManager, 
            ISessionWrapper sessionWrapper, 
            IProxyService<IAuthentication> authenticationProxyService)
        {
            this.processManager = processManager;
            this.sessionWrapper = sessionWrapper;
            this.authenticationProxyService = authenticationProxyService;
        }

        public bool ValidateGebruiker(string gebruikernaam, string wachtwoord)
        {
            bool authenticated = false;


            authenticationProxyService.Use(client =>
            {
                var sessionId = processManager.GetSessionId();

                  authenticated = client.ValidateGebruiker(
                    sessionId,
                    gebruikernaam,
                    wachtwoord);
            });

            return authenticated;
        }

代码第 4 部分:

public class AuthenticationFacadeFixture
    {
        public IProcessManager ProcessManager { get; set; }

        public ISessionWrapper SessionWrapper { get; set; }

        public IProxyService<IAuthentication> AuthenticationProxyService { get; set; }

        public AuthenticationFacade CreateSut()
        {
            ProcessManager = new Mock<IProcessManager>().Object;
            SessionWrapper = new Mock<ISessionWrapper>().Object;
            AuthenticationProxyService = new Mock<IProxyService<IAuthentication>>().Object;

            return new AuthenticationFacade(ProcessManager, SessionWrapper, AuthenticationProxyService);
        }
    }

代码第 5 部分:

public static class MockExtensions
    {
        public static Mock<T> AsMock<T>(this T obj) where T : class
        {
            return Mock.Get(obj);
        }
    }

代码第 6 部分(单元测试):

[TestMethod]
        public void ValidateGebruiker_calls_processmanager_getsessionid_once()
        {
            // Arrange
            var fixture = new AuthenticationFacadeFixture();
            var sut = fixture.CreateSut();

            var validUserPass = CreateValidGebruikersnaamWachtwoord();

            // Act
            sut.ValidateGebruiker(validUserPass.Gebruikersnaam, validUserPass.Wachtwoord);

            // Assert
            fixture.ProcessManager.AsMock().Verify(pm => pm.GetSessionId(), Times.Once());
        }

Answer 1

您省略了 Moq 设置代码，这使得这有点困难，但我相信它看起来像这样:

AuthenticationProxyService.Setup(a => a.Use(It.IsAny<Action<IAuthentication>>()));

如果是这样，您可以执行以下操作:

// Not sure if you have this mock already, this is the "client" variable
// in your Use method action
Mock<IAuthentication> mockAuthentication = mockRepository.Create<IAuthentication>();

AuthenticationProxyService.Setup(a => a.Use(It.IsAny<Action<IAuthentication>>()))
                          .Callback<Action<IAuthentication>>(a => a(mockAuthentication.Object));

Callback方法从设置(Action<IAuthentication>)接收参数，在本例中是 ValidateGebruiker 中的代码，然后用模拟的 IAuthentication 调用它对象(如果您还没有，则需要 Setup)。