c# - Asp.net 核心 session 单元测试

Question

我对 asp.net core mvc Controller 进行单元测试时遇到问题!问题是在我的 Controller 中，我使用 session :

[HttpPost]
public IActionResult OpretLobby(LobbyViewModel lobby)
{
    try
    {
        //find brugeren der har lavet lobby
        var currentUser = HttpContext.Session.GetObjectFromJson<User>("user");
        //save as a lobby
        ILobby nyLobby = new Lobby(currentUser.Username)
        {
            Id = lobby.Id
        };
        SessionExtension.SetObjectAsJson(HttpContext.Session, lobby.Id, nyLobby);
        //add to the list
        _lobbyList.Add(nyLobby);
        return RedirectToAction("Lobby","Lobby",lobby);
    }

这一切都在服务器上在线运行良好，这里没有任何问题。但是当涉及到对整个事情进行单元测试的需求时，它就不再那么完美了。

基本上问题是，我无法通过测试访问我的 session 。我尝试了很多方法来创建模拟，但大多数解决方案都适用于 .net 框架，而不适用于 .net核心出于某种原因!请帮助我痛苦!

注意:

我使用了一个虚拟版本的测试来隔离这个问题:

[Test]
public void TestIsWorking()
{
    SessionExtension.SetObjectAsJson(uut.HttpContext.Session, "user", _savedUser);
    //ViewResult result = uut.OpretLobby(lobbyViewModel) as ViewResult;

    //Assert.AreEqual("OpretLobby", result.ViewName);
    Assert.AreEqual(1,1);
}

尝试为用户设置 session 时也出错了:/

Answer 1

GetObjectFromJson 似乎是一种扩展方法。如果是这样，我们就不能轻松模拟静态方法。

我通常为那种场景创建一个抽象。然后将其注册到DI容器中，并将依赖注入(inject)到 Controller 中。

启动.cs

public class Startup
{
    ...
    public void ConfigureServices(IServiceCollection services)
    {
        ...
        services.AddScoped<IUserSession, UserSession>();
        services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
        ...
    }
    ...
}

抽象

public class User
{
    public string Username { get; set; }
}

public interface IUserSession
{
    User User { get; }
}

public class UserSession : IUserSession
{
    private readonly IHttpContextAccessor _httpContextAccessor;

    public UserSession(IHttpContextAccessor httpContextAccessor)
    {
        _httpContextAccessor = httpContextAccessor;
    }

    public User User => _httpContextAccessor.HttpContext.Session.GetObjectFromJson<User>("user");
}

public static class SessionExtensions
{
    public static User GetObjectFromJson<User>(
        this ISession sesson, string json) where User : new()
    {
        return new User(); // Dummy extension method just to test OP's code
    }
}

Controller

public class HomeController : Controller
{
    private readonly IUserSession _userSession;

    public HomeController(IUserSession userSession)
    {
        _userSession = userSession;
    }

    public IActionResult OpretLobby()
    {
        var currentUser = _userSession.User;
        return View(currentUser);
    }
}

单元测试

using AspNetCore.Controllers;
using Microsoft.AspNetCore.Mvc;
using Moq;
using Xunit;

namespace XUnitTestProject1
{
    public class HomeControllerTests
    {
        private readonly User _user;

        public HomeControllerTests()
        {
            _user = new User {Username = "johndoe"};
        }

        [Fact]
        public void OpretLobby_Test()
        {
            // Arrange
            var mockUserSession = new Mock<IUserSession>();
            mockUserSession.Setup(x => x.User).Returns(_user);
            var sut = new HomeController(mockUserSession.Object);

            // Act
            var result = sut.OpretLobby();

            // Assert
            var viewResult = Assert.IsType<ViewResult>(result);
            var user = Assert.IsType<User>(viewResult.Model);
            Assert.Equal(_user.Username, user.Username);
        }
    }
}