c# - UnitTests - Moq - 如何从与 Setup() 中的参数匹配的 Moq 中返回 () 对象

标签 c# unit-testing moq mstest

我对最小起订量感到困惑,我不确定这里出了什么问题。

我想测试依赖于 ILeadStorageService 的 LeadService,并且我想以这种方式配置 Moq - 返回与设置中传递的 GUID 相匹配的对象。

问题出在 Moq Setup/Returns 行中,因为当我将依赖对象替换为它的真实实例时 - 测试通过,但这是完全错误的。我不想只测试 LeadService,而不是依赖存储。

    public LeadService( IConfigurationDbContext configurationDbContext, 
                        ILeadStorageService leadStorageService,
                        ILeadDeliveryService deliveryService)
    {
        this.configurationDbContext = configurationDbContext;
        this.leadStorageService = leadStorageService;
        this.deliveryService = deliveryService;

    }

测试方法

        public TestLeadResponse ProcessTestLead(TestLeadRequest request)
        {
        var response = new TestLeadResponse()
        {
            Status = TestLeadStatus.Ok
        };

        try
        {
            var lead = leadStorageService.Get(request.LeadId);
            if (lead == null)
            {
                throw new LeadNotFoundException(request.LeadId);
            }

            var buyerContract =
                configurationDbContext.BuyerContracts.SingleOrDefault(bc => bc.Id == request.BuyerContractId);
            if (buyerContract == null)
            {
                throw new BuyerContractNotFoundException(request.BuyerContractId);
            }

            response.DeliveryEntry = deliveryService.DeliverLead(lead, buyerContract);
        }
        catch (LeadNotFoundException e)
        {
            response.Status = TestLeadStatus.LeadNotFound;
            response.StatusDescription = e.Message;
        }
        catch (BuyerContractNotFoundException e)
        {
            response.Status = TestLeadStatus.BuyerContractNotFound;
            response.StatusDescription = e.Message;
        }

        return response;
    }

然后在测试准备中:

    [TestInitialize]
    public void Initialize()
    {
        _leadIdStr = "2c3ac0c0-f0c2-4eb0-a55e-600ae3ada221";

        _dbcontext = new ConfigurationDbContext();
        _lead = PrepareLeadObject();
        _buyerContract = PrepareBuyerContractObject(Id : 1, BuyerContractId :  1, BuyerTag: "GAME");
        _leadDeliveryMock = new Mock<ILeadDeliveryService>();
        _leadStorageMock = new Mock<ILeadStorageService>();
        _leadStorageService = new LeadStorageService("LeadGeneration_Dev");

    }

    private Lead PrepareLeadObject()
    {
        var lead = new Lead() {CountryId = 1, Country = "NL", Id = Guid.Parse(_leadIdStr)};
        return lead;

    }

和测试本身:

    [TestMethod]
    public void LeadServiceTest_ProcessTestLeadWithWrongBuyerContractIDThrowsBuyerContractNotFoundException()
    {
        _leadDeliveryMock
            .Setup(methodCall => methodCall.DeliverLead(_lead, _buyerContract))
            .Returns<LeadDeliveryEntry>((r) => PrepareLeadDeliveryEntry());

        // here is the problem!!!!
        _leadStorageMock.Setup(mc => mc.Get(_leadId)).Returns((Lead l) => PrepareLeadObject());

        //if i change to real object - test passes
        //_service = new LeadService(_dbcontext, _leadStorageService, _leadDeliveryMock.Object);
        _service = new LeadService(_dbcontext, _leadStorageMock.Object, _leadDeliveryMock.Object);

        var response = _service.ProcessTestLead(new TestLeadRequest() { BuyerContractId = int.MaxValue, LeadId = _leadId });

        Assert.IsNotNull(response);
        Assert.AreEqual(response.Status, TestLeadStatus.BuyerContractNotFound);

    }

而不是预期的返回 - 我得到了一个异常(exception): ArgumentException

我在 _leadStorageMock.Setup().Returns() 中缺少什么?

最佳答案

Returns 扩展方法接受一个与您正在模拟的方法具有相同参数的委托(delegate)。这些参数将在调用模拟方法期间传递给委托(delegate)。因此,您将获得传递给 mc.Get 方法的参数,而不是 Lead 对象 - lead id:

_leadStorageMock.Setup(mc => mc.Get(_leadId))
      .Returns((Guid leadId) => PrepareLeadObject());

检查 QuickStart与返回值时访问调用参数相关的部分。


请注意,有一堆 Returns 扩展方法接受值函数作为参数:

Returns<T>(Func<T, TResult> valueFunction);
Returns<T1, T2>(Func<T1, T2, TResult> valueFunction);
Returns<T1, T2, T3>(Func<T1, T2, T3, TResult> valueFunction);
// etc

如您所见,这些值函数计算从模拟方法返回的值,但它们都接收不同数量的参数(最多 16 个)。这些参数将与您正在模拟的方法的参数完全匹配,并且它们将在调用模拟方法期间传递给 valueFunction。所以如果你用两个参数模拟一些函数,那么应该使用相应的扩展:

mock.Setup(m => m.Activate(It.IsAny<int>(), It.IsAny<bool>())
    .Returns((int i, bool b) => b ? i : 0); // Func<T1, T2, TResult>

关于c# - UnitTests - Moq - 如何从与 Setup() 中的参数匹配的 Moq 中返回 () 对象,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/44386748/

相关文章:

c# - 将 OAuth 2 与桌面 c# 应用程序一起使用

c# - 如何在不混淆 Razor 引擎的情况下正确呈现变量?

c# - 发送多封邮件——大型系统中使用的解决方案

python - Django 更新表单的单元测试

C# 如何模拟 Configuration.GetSection ("foo:bar").Get<List<string>>()

c# - 在 WCF 上启用 SSL。客户端需要做什么?

javascript - Angularjs 单元测试解决 promise

java - 如何在 struts 单元测试中测试文件上传?

c# - 带有构造函数参数的最小起订量

c# - 起订量有问题