使用EF进行规范测试-ObjectContext实例已被释放

Question

我有以下SpecFlow场景：

[When(@"the registration is submitted")]
public void WhenTheRegistrationIsSubmitted()
{
    //var controller = _kernel.Get<AccountController>();
    var factory = new HockeyDbContextFactory();
    var userRepository = new Repository<User>(factory);
    var cryptoService = new CryptoService();
    var roleRepository = new Repository<Role>(factory);
    var playerService = new Mock<IPlayerService>();
    var leagueService = new Mock<ILeagueService>();
    var userService = new UserService(userRepository, cryptoService, roleRepository);
    var controller = new AccountController(userService, playerService.Object, leagueService.Object);
    controller.Register(_registerModel);
}

它最终通过我的控制器调用以下方法：

public void RegisterUser(User user)
{
    var salt = _cryptoService.GenerateSalt();
    var hasedPassword = _cryptoService.HashPassword(user.Password, salt);
    user.PasswordSalt = salt;
    user.Password = hasedPassword;
    var defaultRole = _roleRepository.GetAll().Single(x => x.RoleName == "User");
    user.Roles.Add(defaultRole);
    Insert(user);
}

我所有的数据库调用都很好，直到我到达以下线路：

var defaultRole = _roleRepository.GetAll().Single(x => x.RoleName == "User");

当我在那一行上断点并检查对GetAll（）的调用时，我有上下文，可以查看查询。调用Single（）时发生异常。现在，如果我在对GetAll（）的调用上粘贴.Include(x => x.Users)，我就可以了。这告诉我，这与懒惰有关。

我得到的错误是：错误：ObjectContext实例已被释放，不能再用于需要连接的操作

当从我的web应用程序调用RegisterUser时，我很好。当从我的规范测试中调用RegisterUser时，它将失败。有人煽动吗？

更新：

为了添加更多信息，这里是被调用的控制器操作：

[HttpPost]
[AllowAnonymous]
public ActionResult Register(RegisterModel model)
{
    if (!_userService.EmailIsUnique(model.EmailAddress))
        ModelState.AddModelError("EmailAddress", "Email Address is already in use.");
    if (!_userService.UserNameIsUnique(model.UserName))
        ModelState.AddModelError("UserName", "User Name is already in use");
    if (ModelState.IsValid)
    {
        // Attempt to register the user
        try
        {
            var user = Mapper.Map<User>(model);
            _userService.RegisterUser(user);
            FormsAuthentication.SetAuthCookie(model.UserName, false);
            return View("RegisterSuccess");
        }
        catch (MembershipCreateUserException e)
        {
            ModelState.AddModelError("", ErrorCodeToString(e.StatusCode));
        }
    }
    // If we got this far, something failed, redisplay form
    return View(model);
}

通过代码，我从未到达FormsAuthentication.SetAuthCookie(model.UserName, false);

Answer 1

我发现了问题所在。我在测试数据库中植入了以下步骤：

[BeforeFeature]
public static void BeforeFeature()
{
    MappingConfig.RegisterMappings();
    Database.SetInitializer(new TestDatabaseInitializer());
}

我的TestDatabaseInitializer中的上下文一定与我在场景中创建的上下文冲突。感谢Gert的评论，它让我有机会仔细看看我的其他场景中发生了什么。