XUnit 模拟自定义身份管理器和存储，无法实例化类的代理：API.Identity.Managers.MyUserManager

Question

我使用 Moq 来模拟我的 AuthenticationController，初始化 XUnit 测试时发生错误， 问题出在网上测试类的构造函数上：

 _myUserManager = new Mock<MyUserManager<AppUser>>(_myUserStore.Object);

在尝试模拟对象时，该行出现了 Castle.DynamicProxy.InvalidProxyConstructorArgumentsException 类型的异常。

消息和堆栈跟踪在这里：

Message: 
Castle.DynamicProxy.InvalidProxyConstructorArgumentsException : Can not instantiate proxy of class: API.Identity.Managers.MyUserManager`1[[API.Identity.Models.AppUser, API, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].
Could not find a constructor that would match given arguments:
Castle.Proxies.IMyUserStoreProxy

Stack Trace: 
ProxyGenerator.CreateClassProxyInstance(Type proxyType, List`1 proxyArguments, Type classToProxy, Object[] constructorArguments)
ProxyGenerator.CreateClassProxy(Type classToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options, Object[] constructorArguments, IInterceptor[] interceptors)
CastleProxyFactory.CreateProxy(Type mockType, IInterceptor interceptor, Type[] interfaces, Object[] arguments)
Mock`1.InitializeInstance()
Mock`1.OnGetObject()
Mock.get_Object()
Mock`1.get_Object()
AuthenticateControllerTests.ctor() line 47

这里是测试类

public class AuthenticateControllerTests {

    private AuthenticateController _controller;

    private Mock<ILoggerSevice> _loggerSevice;
    private Mock<IJwtAuthService> _jwtAuthService;
    private Mock<IEmailService> _emailService;
    private Mock<IEmailGateway> _emailGateway;
    private Mock<IValidationHelper> _validationHelper;

    private Mock<IMyUserStore> _myUserStore;
    private Mock<MyUserManager<AppUser>> _myUserManager;
    private Mock<IMyCustomerUserStore> _myCustomerUserStore;
    private Mock<MyCustomerUserManager<AppCustomerUser>> _myUserCustomerManager;

    private Mock<SignInManager<AppUser>> _signInManager;
    private Mock<SignInManager<AppCustomerUser>> _signInCustomerManager;

    public AuthenticateControllerTests() {
        //set up authenticate controller
        _loggerSevice = new Mock<ILoggerSevice>();
        _jwtAuthService = new Mock<IJwtAuthService>();
        _emailService = new Mock<IEmailService>();
        _emailGateway = new Mock<IEmailGateway>();
        _validationHelper = new Mock<IValidationHelper>();


        _myUserStore = new Mock<IMyUserStore>();
        _myUserManager = new Mock<MyUserManager<AppUser>>(_myUserStore.Object);
        _signInManager = new Mock<SignInManager<AppUser>>(_myUserManager.Object);

        _myCustomerUserStore = new Mock<IMyCustomerUserStore>();
        _myUserCustomerManager = new Mock<MyCustomerUserManager<AppCustomerUser>>(_myCustomerUserStore.Object);
        _signInCustomerManager = new Mock<SignInManager<AppCustomerUser>>(_myUserCustomerManager.Object);

        _controller = new AuthenticateController(_loggerSevice.Object,
                                                _jwtAuthService.Object,
                                                _myUserManager.Object,
                                                _myUserCustomerManager.Object,
                                                _signInManager.Object,
                                                _signInCustomerManager.Object,
                                                _emailService.Object,
                                                _validationHelper.Object,
                                                _emailGateway.Object);
    }

我的自定义 UserManager 构造函数如下所示：

    public MyUserManager(IMyUserStore myUserStore, 
                         IOptions<IdentityOptions> optionsAccessor, 
                         IPasswordHasher<AppUser> passwordHasher, 
                         IEnumerable<IUserValidator<AppUser>> userValidators, 
                         IEnumerable<IPasswordValidator<AppUser>> passwordValidators, 
                         ILookupNormalizer keyNormalizer, 
                         IdentityErrorDescriber errors,
                         IServiceProvider services, 
                         ILogger<UserManager<AppUser>> logger) : 
                    base(myUserStore, optionsAccessor,
                         passwordHasher, userValidators, passwordValidators,
                         keyNormalizer, 
                         errors, services, logger) {

        _myUserStore = myUserStore;
    }

自定义用户存储：

public interface IMyUserStore : IUserStore<AppUser>, IUserEmailStore<AppUser>, 
                                IUserPhoneNumberStore<AppUser>,
                                IUserTwoFactorStore<AppUser>, IUserPasswordStore<AppUser>, 
                                IUserRoleStore<AppUser> {

public class MyUserStore : IMyUserStore {

    private readonly IUserGateway _userGateway;
    private readonly IRoleGateway _roleGateway;

Answer 1

在模拟 MyUserManager 等实现时，Moq 需要一个可访问的构造函数来创建模拟，并且您需要为所述构造函数提供参数。

所以你的构造函数是

 public MyUserManager(IMyUserStore myUserStore, 
                         IOptions<IdentityOptions> optionsAccessor, 
                         IPasswordHasher<AppUser> passwordHasher, 
                         IEnumerable<IUserValidator<AppUser>> userValidators, 
                         IEnumerable<IPasswordValidator<AppUser>> passwordValidators, 
                         ILookupNormalizer keyNormalizer, 
                         IdentityErrorDescriber errors,
                         IServiceProvider services, 
                         ILogger<UserManager<AppUser>> logger)

但您只提供了一个 IMyUserStore 参数：

new Mock<MyUserManager<AppUser>>(_myUserStore.Object);

您需要提供其余的参数；或使用不同的构造函数（并再次提供参数）；或者更好的是，如果您可以为MyUserManager 定义一个接口，则改为模拟它。