Visual Studio WebAPI Moq安装程序存储库以返回对象，返回空列表

问题描述

我正在用Moq编写webAPI单元测试。我一直在按照示例来模拟依赖项，并将其传递给调用存储库api的服务api。我设置了模拟Repostory以返回1个对象的有效列表，但返回了一个空列表。我看了一下模拟存储库安装程序，看不到为什么它不起作用。

任何帮助将不胜感激。谢谢

这是我的单元测试

[TestMethod]
public void GetUsers()
{
    Mock<IUsersRespository> mockRepository = new Mock<IUsersRespository>();
    var mockMapper = new Mock<IMapper>();

    mockMapper.Setup(m => m.Map<User,Users>(It.IsAny<User>())).Returns(new Users());
    mockMapper.Setup(m => m.Map<Users,User>(It.IsAny<Users>())).Returns(new User());


    User mockUserRecord = new User{ UserId = 1,Title = "View Only",Description = "permission to view" };
    var mockUserList = new List<Users>();
    mockUserList.Add(new Users { UserId = 1,Description = "permission to view" });

    Users request = new Users { UserId = 0,Title = "",Description = "" };


    // here I setup the return object,but it not return that.
    mockRepository.Setup(s => s.GetUsers(request)).Returns(mockUserList.AsEnumerable());

    var mockUserService = new UseRSService(mockRepository.Object,mockMapper.Object);

    var result = mockUserService.GetUsers(new User { UserId = 0,Description = "" });
    // the Get call returns an empty list
            
    mockUserService.Should().NotBeNull();
}

这是我的服务API

public IEnumerable<User> GetUsers(User request)
{
    Users _request = mapper.Map<User,Users>(request);
    var usermodel = UsersRespository.GetUsers(_request);
    var Userviewmodel  = mapper.Map<IEnumerable<Users>,IEnumerable<User>>(usermodel);

    return Userviewmodel;
}

解决方法

在您的设置中，您拥有此

mockMapper.Setup(m => m.Map<User,Users>(It.IsAny<User>())).Returns(new Users()); // This seems ok
mockMapper.Setup(m => m.Map<Users,User>(It.IsAny<Users>())).Returns(new User()); // This seems to be where the issue is

您的服务正在与IEnumerable之间进行映射：

var UserViewModel  = mapper.Map<IEnumerable<Users>,IEnumerable<User>>(UserModel);

第二个模拟设置应该是

// T in "It.IsAny<T>()" should be the type of the local variable UserModel
mockMapper.Setup(m => m.Map<IEnumerable<Users>,IEnumerable<User>>(It.IsAny<???>())).Returns(new List<User> { User() } );

总而言之，这些是值得期待的事情：

1. Map的通用参数不正确。
2. Map的返回值不正确
3. 可能 Map的输入参数不正确，但是我无法从上面的代码中确认。