模拟 ref 参数

Question

我已将其交叉发布到 #moq 讨论组： http://groups.google.com/group/moqdisc/browse_thread/thread/ 569b75fd2cc1829d

嘿伙计们，

我确信我遇到了一个模拟引用参数的问题 一定是显而易见的，但作为框架的新手，我无法使用它 出去。

我有以下存储库方法：

public int SaveCard(int userId, CardPaymentMethodDto
cardPaymentMethodDto)
{
        int? cardId = 0;
        try
        {
                int result = this.dataContext.usp_PaymentMethod_Card_Insert(userId,
                                cardPaymentMethodDto.UserAccountReference,
                                cardPaymentMethodDto.EncryptedCardNumber,
                                cardPaymentMethodDto.BinRange,
                                cardPaymentMethodDto.LastFourDigits,
                                cardPaymentMethodDto.ExpiryMonth,
                                cardPaymentMethodDto.ExpiryYear,
                                cardPaymentMethodDto.IssueNumber,
                                cardPaymentMethodDto.IssuingBank,
                                cardPaymentMethodDto.IssuingCountry,
                                cardPaymentMethodDto.Scheme,
                                cardPaymentMethodDto.StartMonth,
                                cardPaymentMethodDto.StartYear,
                                cardPaymentMethodDto.BillingAddress.House,
                                cardPaymentMethodDto.BillingAddress.SubPremises,
                                cardPaymentMethodDto.BillingAddress.Street,
                                cardPaymentMethodDto.BillingAddress.Town,
                                cardPaymentMethodDto.BillingAddress.County,
                                cardPaymentMethodDto.BillingAddress.Postcode,
                                cardPaymentMethodDto.BillingAddress.Country,
                                cardPaymentMethodDto.DateRegistered,
                                ref cardId);

                if (result <= 0)
                {
                        CompanySystemSqlException tex = new
CompanySystemSqlException("Database communications error");
                        tex.Data.Add("UserId", userId);
                        tex.Data.Add("PaymentMethod", cardPaymentMethodDto.ToString());
                        Logger.LogException("SaveCard: result <= 0", tex);
                        throw tex;
                }
        }
        catch (DbException ex)
        {
                CompanySystemSqlException tex = new
CompanySystemSqlException("Database communications error", ex);
                tex.Data.Add("UserId", userId);
                tex.Data.Add("PaymentMethod", cardPaymentMethodDto.ToString());
                Logger.LogException("SaveCard: DbException", tex);
                throw tex;
        }

        return cardId ?? 0;

}

a 我的单元测试是：

[Test]
public void SaveCard_ValidData_ShouldReturnValidCardId()
{
        int cardId;
        int? refCardId = 0;
        dataContext.DefaultValue = DefaultValue.Mock;
        dataContext.Setup( x =>
x.usp_PaymentMethod_Card_Insert(It.IsAny<int>(), It.IsAny<string>(),
It.IsAny<string>(), It.IsAny<string>(),
                It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>(),
It.IsAny<int>(), It.IsAny<string>(), It.IsAny<string>(),
                It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>(),
It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>(),
                It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>(),
It.IsAny<string>(), It.IsAny<DateTime>(), ref refCardId)).Returns(1);

        cardId = paymentRepository.SaveCard(1, new CardPaymentMethodDto
{ BillingAddress = new AddressDto { Country = "", County = "", House =
"", Postcode = "", Street = "", SubPremises = "", Town = ""},
                                                                                                        BinRange = "", Cv2 = 123,
                                                                                                        DateRegistered = DateTime.Now, EncryptedCardNumber =
"jumble",
                                                                                                        ExpiryMonth = "02", ExpiryYear = "2030", Id = 1,
IssueNumber = 1, IssuingBank = "", IssuingCountry = "",
                                                                                                        LastFourDigits = "", LastUsed = DateTime.MinValue, Scheme
= "", StartMonth = "", StartYear = "",
                                                                                                        UserAccountReference = ""});

        Assert.That(cardId, Is.EqualTo(1));

}

现在显然我必须在单元中创建 ref param (refCardId) 测试，否则无法设置预期结果，但 refCardId <>这 存储库 cardId 变量，所以它显然失败了（结果来自 第一种方法返回为零）。

我确信我错过了一些东西，但是什么......？

感谢您的帮助， 干杯， 特里

Answer 1

从 Moq 4.8（尚未发布，但有预发布版本）开始，您可以使用 It.Ref.IsAny 匹配 ref 参数：

dataContext.Setup(x => x.usp_PaymentMethod_Card_Insert(
                           It.IsAny<int>(),
                           It.IsAny<string>(),
                           ...
                           It.IsAny<DateTime>(),
                           ref It.Ref<int?>.IsAny))
           .Returns(1);

Answer 2

我不太确定我是否理解这个问题，但您在测试中已将 0 分配给 refCardId 。

int? refCardId = 0;

你的模拟不会改变这个值，因为它不能。您的模拟只是一个代理，它完全按照您在安装方法中告诉它的方式执行。在这种情况下，你的 Mock 在被调用时将返回 1。它不会对 refCardId 执行任何操作。

请记住，您的 sut 是 paymentRepository 及其 SaveCard 方法 - 模拟仅用于测试 sut，而不依赖于 dataContext。