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c# - 如何模拟 Entity Framework 并在模拟上下文中获取新的插入值

转载 作者:行者123 更新时间:2023-11-30 21:47:15 25 4
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我在 n 层架构中模拟 Entity Framework 。我正在尝试模拟插入。插入有效,但是当我尝试获取插入实体的值时,我无法获得正确的值。

编辑

这是带有变量pat的测试用例。在这种情况下,测试失败是因为关于尝试日期的断言失败。

var mockContext = new Mock<PublicAreaContext>();

//Here I mock the entity I cannot get the correct values
PaymentAttemptTrace pat = new PaymentAttemptTrace();
var mockSetPaymentAttemptTrace = new Mock<DbSet<PaymentAttemptTrace>>();
mockContext.Setup(m => m.Set<PaymentAttemptTrace>()).Returns(mockSetPaymentAttemptTrace.Object);

//Here I create a fake request
TracePaymentAttemptRequest request = new TracePaymentAttemptRequest();
...

//I call the facade. The facade create a PaymentAttemptTrace and insert it in the mocked db
ToolsFacade facade = new ToolsFacade(mockContext.Object);
TracePaymentAttemptResponse response = facade.TraceAutoPayPaymentAttempt(request);

//All asserts are ok, except the last one. The date remain "empty", even if is valorized correctly during the execution of the code (I have checked in debug)
Assert.IsTrue(response.Result == it.MC.WebApi.Models.ResponseDTO.ResponseResult.Success);

mockSetPaymentAttemptTrace.Verify(m => m.Add(It.IsAny<PaymentAttemptTrace>()), Times.Once());
mockContext.Verify(m => m.SaveChanges(), Times.Once());

Assert.IsTrue(pat.AttemptDate == new DateTime(2016, 07, 27, 11, 46, 24));

这是没有变量pat的测试用例。在这种情况下,测试失败(当然),因为我没有 mock 实体!!!

var mockContext = new Mock<PublicAreaContext>();

//Here I create a fake request
TracePaymentAttemptRequest request = new TracePaymentAttemptRequest();
...

//I call the facade. The facade create a PaymentAttemptTrace and insert it in the mocked db
ToolsFacade facade = new ToolsFacade(mockContext.Object);
TracePaymentAttemptResponse response = facade.TraceAutoPayPaymentAttempt(request);

Assert.IsTrue(response.Result == it.MC.WebApi.Models.ResponseDTO.ResponseResult.Success);

mockSetPaymentAttemptTrace.Verify(m => m.Add(It.IsAny<PaymentAttemptTrace>()), Times.Once());
mockContext.Verify(m => m.SaveChanges(), Times.Once());

这里是我要测试的代码:

public TracePaymentAttemptResponse TraceAutoPayPaymentAttempt(TracePaymentAttemptRequest request)
{
...
DateTime attemptDate = DateTime.Now.Date;
if (!string.IsNullOrWhiteSpace(request.DataTentativoPagamento))
{
try
{
attemptDate = DateTime.ParseExact(request.DataTentativoPagamento, "yyyyMMddTHHmmss", System.Globalization.CultureInfo.InvariantCulture);
}
catch (Exception) { /* Do nothing. attemptDate = DateTime.Now.Date; */ }
}

PaymentAttemptTrace trace = this.CreatePaymentAttemptTraceEntity(/* All data I need to create my entity */);

Repository<PaymentAttemptTrace> repository = new Repository<PaymentAttemptTrace>(base.Context);
repository.Insert(trace); // <- If not mock the entity pat, here go in exception!!

repository.SaveChanges();

...
}

所以我必须模拟 pat 变量,即使我没有在测试中使用它!我测试的目的是验证 attemptDate 的解析是否正确。

可能是什么问题?我想念什么?

谢谢

再次编辑我让你看另一个测试。这个测试有效!在这个测试中,我必须更新一个实体:

var mockContext = new Mock<PublicAreaContext>() { CallBase = true };

List<BillingCenter> billingCenters = new List<BillingCenter>()
{
new BillingCenter() { Id = "12345600", CustomerId = "123456", PaymentMethod = PaymentMethod.Easypay }
};

var data = billingCenters.AsQueryable();

var mockSet = new Mock<DbSet<T>>();
mockSet.As<IQueryable<T>>().Setup(m => m.Provider).Returns(data.Provider);
mockSet.As<IQueryable<T>>().Setup(m => m.Expression).Returns(data.Expression);
mockSet.As<IQueryable<T>>().Setup(m => m.ElementType).Returns(data.ElementType);
mockSet.As<IQueryable<T>>().Setup(m => m.GetEnumerator()).Returns(data.GetEnumerator());

mockContext.Setup(m => m.Set<BillingCenter>()).Returns(mockSet.Object);

mockContext.Setup(x => x.SaveChanges()).Returns(1);

//Here I create a request
UpdateEasyPayFromResultPaymentRequest request = new UpdateEasyPayFromResultPaymentRequest();
...

PublicAreaFacade facade = new PublicAreaFacade(mockContext.Object);
UpdateEasyPayFromResultPaymentResponse response = facade.UpdateEasyPayFromResultPayment(request);

Assert.IsTrue(billingCenters[0].PaymentMethod == PaymentMethod.Autopay);

如您所见,我使用 paymentMethod = Easypay 创建了 billingCenter。在测试结束时,我做了一个 asserto 来检查账单的支付方式Autopay 中的中心已更改。但是我没有改变test里面的值!我在 facade.UpdateEasyPayFromResultPayment 方法中更改了它

最佳答案

这是您已经发现的另一种解决方案

//ARRANGE
bool patAdded = false;
PaymentAttemptTrace pat = null; //will assign a value to this when adding new entity

var mockSetPaymentAttemptTrace = new Mock<DbSet<PaymentAttemptTrace>>();
//setup a call back on Add to get the entity that was added to dbset
mockSetPaymentAttemptTrace
.Setup(m => m.Add(It.IsAny<PaymentAttemptTrace>()))
.Callback((PaymentAttemptTrace arg) => {
pat = arg;
padAdded = (pat != null);
});

var mockContext = new Mock<PublicAreaContext>();
mockContext.Setup(m => m.Set<PaymentAttemptTrace>()).Returns(mockSetPaymentAttemptTrace.Object);
mockContext.Setup(x => x.SaveChanges()).Returns(1);//for when you save the added entity

//Here I create a fake request
TracePaymentAttemptRequest request = new TracePaymentAttemptRequest();

...

//I call the facade. The facade create a PaymentAttemptTrace and insert it in the mocked db
ToolsFacade facade = new ToolsFacade(mockContext.Object);

//ACT
TracePaymentAttemptResponse response = facade.TraceAutoPayPaymentAttempt(request);

//ASSERT
Assert.IsTrue(response.Result == it.MC.WebApi.Models.ResponseDTO.ResponseResult.Success);

mockSetPaymentAttemptTrace.Verify(m => m.Add(It.IsAny<PaymentAttemptTrace>()), Times.Once());
mockContext.Verify(m => m.SaveChanges(), Times.Once());

Assert.IsTrue(patAdded);
Assert.IsTrue(pat.AttemptDate == new DateTime(2016, 07, 27, 11, 46, 24));

关于c# - 如何模拟 Entity Framework 并在模拟上下文中获取新的插入值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38611163/

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