如何模拟 Entity Framework 并在模拟上下文中获取新的 Inserted 值
How to mock Entity Framework and get the new Inserted value in the mocked context
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
这是测试用例 和 变量 pat。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），因为我没有嘲笑实体！！！
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，即使我在测试中不使用它！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！在此测试中，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，我用 paymentMethod = Easypay 创建了 billingCenter。在测试结束时，我做了一个 asserto 检查计费中心的支付方式是否在 Autopay。但是我没有改变test里面的值！我在 facade.UpdateEasyPayFromResultPayment 方法
中更改它
我已经这样解决了
var mockContext = new Mock<PublicAreaContext>();
//Here I mock the entity I cannot get the correct values
List<PaymentAttemptTrace> pat = new List<PaymentAttemptTrace>();
var mockSetPaymentAttemptTrace = new Mock<DbSet<PaymentAttemptTrace>>();
mockSetPaymentAttemptTrace.Setup(m => m.Add(It.IsAny<PaymentAttemptTrace>())).Callback<PaymentAttemptTrace>(list.Add);
mockContext.Setup(m => m.Set<PaymentAttemptTrace>()).Returns(mockSetPaymentAttemptTrace.Object);
mockContext.Setup(x => x.SaveChanges()).Returns(1);
//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[0].AttemptDate == new DateTime(2016, 07, 27, 11, 46, 24));
这里的差异与我的问题相比：
List<PaymentAttemptTrace> pat = new List<PaymentAttemptTrace>();
var mockSetPaymentAttemptTrace = new Mock<DbSet<PaymentAttemptTrace>>();
mockSetPaymentAttemptTrace.Setup(m => m.Add(It.IsAny<PaymentAttemptTrace>())).Callback<PaymentAttemptTrace>(list.Add);
和
mockContext.Setup(x => x.SaveChanges()).Returns(1);
我不喜欢这个解决方案，只是...但它有效！！！我在等更好的东西！谢谢
这是您已经发现的另一个解决方案
//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));
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
这是测试用例 和 变量 pat。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），因为我没有嘲笑实体！！！
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，即使我在测试中不使用它！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！在此测试中，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，我用 paymentMethod = Easypay 创建了 billingCenter。在测试结束时，我做了一个 asserto 检查计费中心的支付方式是否在 Autopay。但是我没有改变test里面的值！我在 facade.UpdateEasyPayFromResultPayment 方法
我已经这样解决了
var mockContext = new Mock<PublicAreaContext>();
//Here I mock the entity I cannot get the correct values
List<PaymentAttemptTrace> pat = new List<PaymentAttemptTrace>();
var mockSetPaymentAttemptTrace = new Mock<DbSet<PaymentAttemptTrace>>();
mockSetPaymentAttemptTrace.Setup(m => m.Add(It.IsAny<PaymentAttemptTrace>())).Callback<PaymentAttemptTrace>(list.Add);
mockContext.Setup(m => m.Set<PaymentAttemptTrace>()).Returns(mockSetPaymentAttemptTrace.Object);
mockContext.Setup(x => x.SaveChanges()).Returns(1);
//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[0].AttemptDate == new DateTime(2016, 07, 27, 11, 46, 24));
这里的差异与我的问题相比：
List<PaymentAttemptTrace> pat = new List<PaymentAttemptTrace>();
var mockSetPaymentAttemptTrace = new Mock<DbSet<PaymentAttemptTrace>>();
mockSetPaymentAttemptTrace.Setup(m => m.Add(It.IsAny<PaymentAttemptTrace>())).Callback<PaymentAttemptTrace>(list.Add);
和
mockContext.Setup(x => x.SaveChanges()).Returns(1);
我不喜欢这个解决方案，只是...但它有效！！！我在等更好的东西！谢谢
这是您已经发现的另一个解决方案
//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));