.Net Core C# 如何获取具有私有成员字段的对象并设置这些私有对象的方法？

Question

我正在使用.Net Core 8，并且我有以下课程：

public class UserRepository : EfRepository<User>, IUserRepository
{
    private readonly IJwtFactory _jwtFactory;
    private readonly IJwtTokenValidator _jwtTokenValidator;
    private readonly ITokenFactory _tokenFactory;
    private readonly UserManager<AppUser> _userManager;
    private readonly SignInManager<AppUser> _signInManager;
    private readonly IMapper _mapper;
    private readonly ILogger<UserRepository> _logger;
    public UserRepository(ILogger<UserRepository> logger, UserManager<AppUser> userManager, SignInManager<AppUser> signInManager, IMapper mapper, AppDbContext appDbContext, IJwtFactory jwtFactory, IJwtTokenValidator jwtTokenValidator, ITokenFactory tokenFactory) : base(appDbContext)
    {
        _userManager = userManager;
        _signInManager = signInManager;
        _jwtFactory = jwtFactory;
        _jwtTokenValidator = jwtTokenValidator;
        _tokenFactory = tokenFactory;
        _mapper = mapper;
        _logger = logger;
    }
public async virtual Task<MyResponse> MethodUnderTest(string id)
{
_userManager.DoSomeThing(); // Moq'ed object
_signInManager.DoSomeThins(); // Moq'ed object
}
<snip>
}

(1) 我应该

Moq

IUserRepository

还是物体？如何设置私有对象

UserManager

和

SignInManager

的函数调用？事实上，我如何将

Moq

和

UserManager

中的

SignInManager

传递给

Moq

ed

IUserInterface

？

(2) 当我

Moq

UserRepository

对象时，将

Moq

对象传递给测试构造函数下的另一个对象时遇到以下异常：

System.ArgumentException : Can not instantiate proxy of class: Web.Api.Infrastructure.Data.Repositories.UserRepository.
Could not find a constructor that would match given arguments:
Castle.Proxies.ILogger`1Proxy
Castle.Proxies.UserManager`1Proxy
Castle.Proxies.SignInManager`1Proxy
Castle.Proxies.IMapperProxy
Castle.Proxies.AppDbContextProxy
Castle.Proxies.IJwtFactoryProxy
Castle.Proxies.IJwtTokenValidatorProxy
Castle.Proxies.ITokenFactoryProxy
 (Parameter 'constructorArguments')
---- System.MissingMethodException : Constructor on type 'Castle.Proxies.UserRepositoryProxy' not found.

目标是能够最小化测试中涉及

UserRepository

方法的所有对象，并使用相应的方法

Setup

进行测试。为此，我有一个类固定装置，它创建所有

moq

：

public class InfrastructureTestBase : IDisposable
{
    public Mock<UserManager<AppUser>> UserManager { get; } = new Mock<UserManager<AppUser>>(Mock.Of<IUserStore<AppUser>>(), null, null, null, null, null, null, null, null);
    public Mock<SignInManager<AppUser>> SignInManager { get; }
    public Mock<ILogger<IUserRepository>> Logger { get; } = new Mock<ILogger<IUserRepository>>();
    public Mock<IMapper> Mapper { get; } = new Mock<IMapper>();
    public Mock<AppDbContext> AppDbContext { get; } = new Mock<AppDbContext>(new DbContextOptions<AppDbContext>());
    public Mock<IJwtFactory> JwtFactory { get; } = new Mock<IJwtFactory>();
    public Mock<IJwtTokenValidator> JwtTokenValidator { get; } = new Mock<IJwtTokenValidator>();
    public Mock<UserRepository> UserRepository { get; private set; }
    public Mock<ITokenFactory> TokenFactory { get; } = new Mock<ITokenFactory>();
    public InfrastructureTestBase()
    {
        SignInManager = new Mock<SignInManager<AppUser>>(UserManager.Object, Mock.Of<IHttpContextAccessor>(), Mock.Of<IUserClaimsPrincipalFactory<AppUser>>(), null, null, null, null);
        SignInManager.Setup(i => i.RefreshSignInAsync(It.IsAny<AppUser>()));
        UserRepository = new Mock<UserRepository>(Logger.Object, UserManager.Object, SignInManager.Object, Mapper.Object, AppDbContext.Object, JwtFactory.Object, JwtTokenValidator.Object, TokenFactory.Object);
    }

    public void Dispose()
    {
        //throw new NotImplementedException();
    }
}

Answer 1

如果您需要编写

UserRepository

类本身的测试，那么您可以创建其所有依赖项的 Test Doubles，如 OP 中所示。

无需创建

Mock<UserRepository>

，因为在这种情况下，

UserRepository

对象是被测系统 (SUT)：

var userRepository = new UserRepository(
    Logger.Object,
    UserManager.Object,
    SignInManager.Object,
    Mapper.Object,
    AppDbContext.Object,
    JwtFactory.Object,
    JwtTokenValidator.Object,
    TokenFactory.Object);
// Test code that exercises userRepository go here; e.g.
var actual = await userRepository.MethodUnderTest("foo");

另一方面，如果您需要测试另一个依赖于

IUserRepository

的类，只需创建它的测试替身：

var userRepositoryTD = new Mock<IUserRepository>();
// Configure one or more interface members if needed:
userRepositoryTD.Setup(r => r.MethodUnderTest("foo")).ReturnsAsync(whatever);
// Now pass the Test Double to your actual SUT
var sut = new MyClass(userRepositoryTD.Object);
// Then add test code that exercises the sut here...

userRepositoryTD.Object

是

IUserRepository

接口的动态生成实现，它与具体的

UserRepository

类没有任何关系。因此，在这种情况下，无需配置任何

UserRepository

类的依赖项（

userManager

、

userManager

等）。

userRepositoryTD.Object

没有这些依赖性。