谁用过moq?用moq写单元测试时，如何模拟httpcontext。

Question

    public static VMERPUser Me
    {
        get
        {
            FormsIdentity userIdentity = HttpContext.Current.User.Identity as FormsIdentity;
            if (userIdentity != null)
            {
                FormsAuthenticationTicket ticket = userIdentity.Ticket;
                return JsonConvert.DeserializeObject<VMERPUser>(ticket.UserData);
            }
            return null;
        }
    }
            让我能够通过这个方法得到值。不会报错。求moq给httpcontext赋值的例子