c# – 使用Moq测试get / set

我有这个方法：

public Invoice Approve(Invoice invoiceToBeApproved)
{
    var approvedInvoiceStatus = InvoiceStatusRepository.First<ApprovedStatus>();

    invoiceToBeApproved.Car.RemainingSeats -= 1;

    if (invoiceToBeApproved.Car.RemainingSeats < 0)
    {
        throw new BusinessException("There are no remaining seats");
    }

    invoiceToBeApproved.InvoiceStatus = approvedInvoiceStatus;

    InvoiceRepository.Update(invoiceToBeApproved);

    context.SaveChanges();

    return invoiceToBeApproved;
}

我正在进行单元测试(不进行集成测试,所以我不会去数据库).

我想测试的是

invoiceToBeApproved.Car.RemainingSeats -= 1;

我尝试使用VerifyGet,但我无法达到该属性.

我的部分测试是这样的

var newInvoice = InvoiceService.ApproveInvoice(invoice);
InvoiceStatusRepository.Verify(x => x.First<ApprovedStatus>());
InvoiceRepository.Verify(x => x.Update(It.IsAny<Invoice>()));
context.Verify(x => x.SaveChanges(),Times.Exactly(1));

如何测试RemainingSeats的设置/获取？

提前致谢！