模拟使用Moq返回void的更新方法

Question

在我的测试中,我将数据定义为数据a List<IUser>.

我想设置一个moq方法Update,这个方法接收用户id并string进行更新.

然后我得到了IUser并更新了属性LastName

我试过这个:

namespace Tests.UnitTests
{
    [TestClass]
    public class UsersTest
    {
        public IUsers MockUsersRepo;
        readonly Mock<IUsers> _mockUserRepo = new Mock<IUsers>();
        private List<IUser> _users = new List<IUser>();

        [TestInitialize()]
        public void MyTestInitialize()
        {
            _users = new List<IUser>
                {
                    new User { Id = 1, Firsname = "A", Lastname = "AA", IsValid = true },
                    new User { Id = 1, Firsname = "B", Lastname = "BB", IsValid = true }
                };

            Mock<IAction> mockUserRepository = new Mock<IAction>();
            _mockUserRepo.Setup(mr => mr.Update(It.IsAny<int>(), It.IsAny<string>()))
                .Returns(???);

            MockUsersRepo = _mockUserRepo.Object;
        }

        [TestMethod]
        public void Update()
        {
            //Use the mock here
        }

    }
}

但我得到这个错误:无法解决返回symbole

你有身份证吗？

class User : IUser
{
    public int Id { get; set; }
    public string Firsname { get; set; }
    public string Lastname { get; set; }
    public bool IsValid { get; set; }
}

interface IUser
{
    int Id { get; set; }
    string Firsname { get; set; }
    string Lastname { get; set; }
    bool IsValid { get; set; }
}

interface IAction
{
    List<IUser> GetList(bool isActive);
    void Update(int id, string lastname)
}

class Action : IAction
{
    public IUser GetById(int id)
    {
        //....
    }
    public void Update(int id, string lastname)
    {
        var userToUpdate = GetById(id);
        userToUpdate.LastName = lastname;
        //....
    }
}

Answer 1

如果您只想验证调用此方法,则应使用Verifiable()方法.

_mockUserRepository.Setup(mr => mr.Update(It.IsAny<int>(), It.IsAny<string>()))
                   .Verifiable();

如果您还想对这些参数执行某些操作,请先使用Callback().

_mockUserRepository.Setup(mr => mr.Update(It.IsAny<int>(), It.IsAny<string>()))
                   .Callback((int id, string lastName) => {
                       //do something
                       }).Verifiable();

更新

如果你返回一个bool值,你应该如何模拟它.

_mockUserRepository.Setup(mr => mr.Update(It.IsAny<int>(), It.IsAny<string>()))
                   .Returns(true);

Answer 2

Mock<IUsers> _mockUserRepository = new Mock<IUsers>();
        _mockUserRepository.Setup(mr => mr.Update(It.IsAny<int>(), It.IsAny<string>()))
                            .Callback((int id, string name) =>
                                {
                                    //Your callback method here
                                });
 //check to see how many times the method was called
 _mockUserRepository.Verify(mr => mr.Update(It.IsAny<int>(), It.IsAny<string>()), Times.Once());