使用 NSubstitute 模拟 Web 服务时出错

Question

我正在尝试模拟一个继承自 SoapHttpClientProtocol 且我无法在单元测试中修改的 Web 服务对象。不幸的是，当我尝试时：

 var myApi = Substitute.ForPartsOf<MyAPIClass>();

我收到以下错误：

Message: Test method MyProj.Test.Business.Folder.CalendarEventServiceUnitTest.GetPerformances_WithEventsAndPerformances_CorrectlyDistinguishesThem threw exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidOperationException: There was an error reflecting type 'MyNamespace.MyAPIClass'. ---> System.InvalidOperationException: Cannot serialize member 'System.ComponentModel.Component.Site' of type 'System.ComponentModel.ISite', see inner exception for more details. ---> System.NotSupportedException: Cannot serialize member System.ComponentModel.Component.Site of type System.ComponentModel.ISite because it is an interface.

Answer 1

不要尝试模拟您无法控制的代码（即第 3 方代码）。抽象所需的行为并将第 3 方代码封装在您的抽象实现中。

public interface IMyApiInterface {
    //...code removed for brevity
}

将抽象注入它们的依赖项类。这将允许更好地模拟您的单元测试和整体更多 flexible/maintainable 架构。

var myApi = Substitute.For<IMyApiInterface>();

接口的实际实现将封装或组合实际的 Web 服务。

public class MyProductionAPIClass : MyAPIClass, IMyApiInterface {
    //...code removed for brevity
}

不要将您的代码与不允许灵活和可维护代码的实现问题紧密耦合。取而代之的是抽象。

使用 NSubstitute 模拟 Web 服务时出错

Error Mocking a webservice with NSubstitute

.net

c#

unit-testing

nsubstitute