要模拟的AutoMock CreateInstance类型必须是接口、委托或非密封的非静态类

Question

当我用Moq.AutoMock.Automocker模拟"autoMocker.CreateInstance();“时，我得到了下面的通用消息。HeliumController类的构造函数有几个接口。我如何才能找到哪个特定的接口或构造函数无法模拟？

{System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
 ---> System.NotSupportedException: Type to mock must be an interface, a delegate, or a non-sealed, non-static class.
   at Moq.Guard.IsMockable(Type type)
   at Moq.Mock`1..ctor(MockBehavior behavior, Object[] args)
   at Moq.Mock`1..ctor(MockBehavior behavior)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)
   at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture)
   at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
   at System.Activator.CreateInstance(Type type, Object[] args)
   at Moq.AutoMock.Resolvers.MockResolver.Resolve(MockResolutionContext context)
   at Moq.AutoMock.AutoMocker.Resolve(Type serviceType, Object initialValue)
   at Moq.AutoMock.AutoMocker.Resolve(Type serviceType)
   at Moq.AutoMock.AutoMocker.Get(Type serviceType)
   at Moq.AutoMock.AutoMocker.<CreateArguments>b__58_0(ParameterInfo x)
   at System.Linq.Enumerable.SelectArrayIterator`2.ToArray()
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
   at Moq.AutoMock.AutoMocker.CreateArguments(Type type, BindingFlags bindingFlags)
   at Moq.AutoMock.AutoMocker.CreateInstance(Type type, Boolean enablePrivate)
   at Moq.AutoMock.AutoMocker.CreateInstance[T](Boolean enablePrivate)
   at Moq.AutoMock.AutoMocker.CreateInstance[T]()
   at Helium.Api.Tests.API.v2.HeliumControllerSearchTests..ctor()

Answer 1

不幸的是，这将是一些试验和错误，检查构造函数采用的类型，然后查看是否有任何类型不符合要求-我会首先开始并查看您正在使用的密封类，因为这可能是原因。接口、非密封的、非静态的和委托--这些都可以被模仿。

我确实注意到异常中没有任何行号。我猜可能是在“发布”模式下进行测试，因此符号不可用。通常，"Debug“模式下的异常堆栈具有发生异常的实际行号--在"Debug”模式下编译和运行测试以查看实际行可能会有所帮助。这可能会缩小范围。

Here's where the not-mockable exception is thrown in Moq.看起来他们可以很容易地将实际的类型名称添加到异常中，但这并没有发生。如果我是你，I'd file an issue with the Moq folks并要求他们更新以在异常中包含类型名称。如果他们对此表示同意，那么提交给他们并使产品变得更好，同时解决您的问题似乎是一个非常容易的拉动请求。