Question

在我的测试中，这是我的代码：

[SetUp]
        public void Initialise()
        {
            mockOwinManager = new Mock<IOwinManager<ApplicationUser, ApplicationRole>>();
            mockSearch = new Mock<ISearch<ApplicationUser>>();
            mockMail = new Mock<IRpdbMail>();
            mockUserStore = new Mock<IUserStore<ApplicationUser>>();

            mockOwinManager.Setup(x => x.UserManager).Returns(() => new AppUserManager(mockUserStore.Object));

            sut = new UsersController(mockOwinManager.Object, mockSearch.Object, mockMail.Object);
        }

然后是测试本身：

    [Test]
    public void WhenPut_IfUserIsNullReturnInternalServerError()
    {
        //Arrange
        mockOwinManager.Setup(x => x.UserManager.FindByIdAsync(It.IsAny<string>())).Returns(() => null);

        //Act
        var response = sut.Put(new AppPersonUpdate());

        //Assert
        Assert.AreEqual(response.Result.StatusCode, HttpStatusCode.InternalServerError);
    }

但是我的排列行引发了以下错误：

Can not instantiate proxy of class: Microsoft.AspNet.Identity.UserManager`1[[SWDB.BusinessLayer.Identity.ApplicationUser, SWDB.BusinessLayer, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].
Could not find a parameterless constructor.

为什么会这样，因为在设置中我已经将我的mockOwinManager的UserManager属性设置为我希望它返回的内容？

由于

Answer 1

首先创建UserManager的模拟对象。然后设置其虚拟方法FindByIdAsync（假设属性UserManager的类型是类AppUserManager，并且假设此类实现IAppUserManager）。

var yourMockOfUserManager = new Mock<IAppUserManager>();
yourMockOfUserManage.Setup(x=>x.FindByIdAsync(It.IsAny<string>())).Returns(() => null);

最后

mockOwinManager.Setup(x => x.UserManager).Returns(() => yourMockOfUserManager.Object);

Answer 2

UserManager类在构造函数中接受IUserStore<ApplicationUser>，该构造函数用于获取对FindByIdAsync等的访问权限

当我需要测试需要UserManager的类时，我会为IUserStore进行模拟并设置其FindByIdAsync方法，然后创建UserManager的实例并提供模拟其参数。这是一个类构造器，需要UserManager：

internal class UserManagerWrapper
{
    private readonly IEditUserResponceDataModelProvider _editUserResponceDataModelProvider;
    private readonly UserManager<User> _userManager;
    private readonly IUserModelFactory _userModelFactory;

    public UserManagerWrapper(UserManager<User> userManager,
        IUserModelFactory userModelFactory,
        IEditUserResponceDataModelProvider editUserResponceDataModelProvider)
    {
        _userManager = userManager;
        _userModelFactory = userModelFactory;
        _editUserResponceDataModelProvider = editUserResponceDataModelProvider;
    }

    public async Task<IUserModel> FindByIdAsync(string id)
    {      
        var user = await _userManager.FindByIdAsync(id);
        return _userModelFactory.Create(user.Id, user.Email, user.Year, user.UserName);
    }
}

这是我对UserManagerWrapper的测试：

private Mock<IUserStore<User>> UserStoreMock { get; set; }

[SetUp]
public void SetUp()
{
    UserStoreMock = new Mock<IUserStore<User>>();
    UserStoreMock.Setup(x => x.FindByIdAsync(It.IsAny<string>(), CancellationToken.None))
        .Returns(Task.FromResult(new User() {Year = 2020}));
}

[TestCase(2020)]
public async Task ValidateUserYear(int year)
{

    var userManager = new UserManager<User>(UserStoreMock.Object, null, null, null, null, null, null, null, null);

    var userManagerWrapper = new UserManagerWrapper(userManager, new UserModelFactory(), null);
    var findByIdAsync = await userManagerWrapper.FindByIdAsync("1");
    Assert.AreEqual(findByIdAsync.Year, year);
}`:

模拟 - 无法实例化代理类属性？

2 个答案: