使用EF进行规范测试 - 已经处理了ObjectContext实例

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);
}

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);
}

在我到达这一行之前，我的所有数据库调用都没问题：

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

当我在该行断点并检查对GetAll（）的调用时，我有上下文，我可以查看查询 . 调用Single（）时发生异常 . 现在，如果我在GetAll（）的调用上坚持 .Include(x => x.Users) ，我很好 . 这告诉我它与延迟加载有关 .

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 .

从我的Web应用程序调用RegisterUser时，我很好 . 从我的规范测试中调用RegisterUser时，它会失败 . 有人有煽动吗？

UPDATE:

要添加更多信息，这里是调用的控制器操作：

[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);
}

单步执行代码，我从来没有把它变成 FormsAuthentication.SetAuthCookie(model.UserName, false);