MOQ查询永不返回

我不确定我做错了什么,但在测试中运行这行代码时,它永远不会返回(似乎会导致一个溢出过程):

var discountMemberCustomer = (from customer in Mocks.Query<Customer>()
    where customer.IsDiscountMember &&
        customer.OrderCount == 13 &&
        customer.LifetimeCustomerValue == 5555m
        select customer).First();

据我所知,我下面举几个例子: http://www.clariusconsulting.net/blogs/kzu/archive/2009/08/13/164978.aspx