在asp.net mvc5中对asp.net身份嘲弄IUserStore

我正试图从帐户控制器单元测试我的mvc5应用程序注册操作。在我的单元测试中，我试图模拟IUserStore，但我有一些有线铸造问题。

//inside unit FileName = testegisterationSpecs.cs
var store = new Mock<IUserStore<ApplicationUser>>(MockBehavior.Strict);

我的ApplicationUser模型如下，您可以看到继承链。

public class ApplicationUser : IdentityUser
{
    //[Required]
    public string FirstName { get; set; }
    //[Required]
    public string LastName { get; set; }
    //[Required]
    public string Email { get; set; }
}

public class IdentityUser : IUser
{
    public IdentityUser();
    public IdentityUser(string userName);
    public virtual ICollection<IdentityUserClaim> Claims { get; }
    public virtual string Id { get; set; }
    public virtual ICollection<IdentityUserLogin> Logins { get; }
    public virtual string PasswordHash { get; set; }
    public virtual ICollection<IdentityUserRole> Roles { get; }
    public virtual string SecurityStamp { get; set; }
    public virtual string UserName { get; set; }
}

下面是我得到的错误。

The type 'JumpStartPakistan.Web.Models.ApplicationUser' cannot be used as type parameter 'TUser' in the generic type or method 'Microsoft.AspNet.Identity.IUserStore<TUser>'. There is no implicit reference conversion from 'JumpStartPakistan.Web.Models.ApplicationUser' to 'Microsoft.AspNet.Identity.IUser<string>'.   E:'Projects'AspNet'MVC'JumpStartPakistanReboot'JumpStartPakistan'JumpStartPakistan.Tests'Web'Registration'RegisterationSpecs.cs