无法让 RhinoMocks 发出遵循通用类型限制规则的模拟

Question

因此，使用 NUnit 和 RhinoMocks：

//Defines basic behavior of all persistable domain objects
public interface IDomainObject {...}

//defines domain objects specific to the Security DB
public interface ISecurityDomainObject : IDomainObject {...}

//Defines a basic transactional data Repository; there are multiple implementors
//which each close TRest to the interface that defines their DB's domain classes
public interface IRepository<TRest> : IDisposable where TRest:IDomainObject
{
    IUnitOfWork BeginUnitOfWork();
    void CommitUnitOfWork(IUnitOfWork unitOfWork);
    void RollBackUnitOfWork(IUnitOfWork unitOfWork);        
    void Save<T>(T domainObject, IUnitOfWork unitOfWork) where T : class, TRest;        
    IQueryable<T> QueryFor<T>(IUnitOfWork unitOfWork) where T :class, TRest;
}

public interface ISecurityRepository:IRepository<ISecurityDomainObject> {}

public class SecurityRepository:ISecurityRepository

...

//This line breaks when run in an NUnit test
var securityRepository = MockRepository.GenerateMock<ISecurityRepository>();
...

我得到的错误是：

System.TypeLoadException : Method 'Save' on type 'ISecurityRepositoryProxyb8e21deb3cb04067a01ac5b63f7045af' from assembly 'DynamicProxyGenAssembly2, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' tried to implicitly implement an interface method with weaker type parameter constraints.
at System.Reflection.Emit.TypeBuilder.TermCreateClass(RuntimeModule module, Int32 tk, ObjectHandleOnStack type)
at System.Reflection.Emit.TypeBuilder.CreateTypeNoLock()
at System.Reflection.Emit.TypeBuilder.CreateType()
at Castle.DynamicProxy.Generators.Emitters.AbstractTypeEmitter.BuildType()
at Castle.DynamicProxy.Generators.InterfaceProxyWithTargetGenerator.GenerateCode(Type proxyTargetType, Type[] interfaces, ProxyGenerationOptions options)
at Castle.DynamicProxy.DefaultProxyBuilder.CreateInterfaceProxyTypeWithoutTarget(Type interfaceToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options)
at Castle.DynamicProxy.ProxyGenerator.CreateInterfaceProxyTypeWithoutTarget(Type interfaceToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options)
at Castle.DynamicProxy.ProxyGenerator.CreateInterfaceProxyWithoutTarget(Type interfaceToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options, IInterceptor[] interceptors)
at Rhino.Mocks.MockRepository.MockInterface(CreateMockState mockStateFactory, Type type, Type[] extras)
at Rhino.Mocks.MockRepository.CreateMockObject(Type type, CreateMockState factory, Type[] extras, Object[] argumentsForConstructor)
at Rhino.Mocks.MockRepository.DynamicMock(Object[] argumentsForConstructor)
at Rhino.Mocks.MockRepository.<>c__DisplayClass7`1.<GenerateMock>b__6(MockRepository r)
at Rhino.Mocks.MockRepository.CreateMockInReplay(Func`2 createMock)
at Rhino.Mocks.MockRepository.GenerateMock(Object[] argumentsForConstructor)
at CSHD.Tests.Unit.Presentation.LoginTests.TestAuthenticationFails() in LoginTests.cs: line 138 

当尝试针对具体类生成模拟时，我得到了类似的错误，这次是在 QueryFor() 方法上。如果我尝试重新定义 ISecurityRepository 接口中使用 TRest 的方法，则会收到“System.BadImageFormatException：尝试加载格式不正确的程序。（来自 HRESULT 的异常：0x8007000B）”，这看起来像是倒退了一步。

我认为核心问题是 RhinoMocks 对用作泛型类型限制的泛型参数感到困惑。我不知道它在哪里被混淆，因此我不知道如何或是否可以消除它的混淆。我有足够的集成测试覆盖率，如果我绝对有必要的话，我可以忽略这些失败的单元测试，但显然如果可以的话我宁愿修复它们。你的想法？

Answer 1

看起来这是由 Castle.DynamicProxy 引起的已知问题，该问题已在该项目的最新主干中修复，但在最新的 Rhino Mocks 版本中仍然出现问题：

http://groups.google.com/group/rhinomocks/browse_thread/thread/2c1b53bf66b77b8e/ad09a6cd1e304a93

如果您喜欢冒险您可以使用最新的 DynamicProxy 构建自己的 Rhino Mocks，它应该已修复。

Answer 2

根据您定义通用参数的方式，Castle Dynamic Proxy（Rhino Mocks 用于生成代理）似乎没有正确生成代理类。如果您像这样定义 IRepository，则可以生成代理（因此是模拟）：

public interface IRepository<T> : IDisposable where T : class, IDomainObject
{
    IUnitOfWork BeginUnitOfWork();
    void CommitUnitOfWork(IUnitOfWork unitOfWork);
    void RollBackUnitOfWork(IUnitOfWork unitOfWork);        
    void Save(T domainObject, IUnitOfWork unitOfWork);        
    IQueryable<T> QueryFor(IUnitOfWork unitOfWork);
}

如果您确实需要以其他方式定义它，则必须使用 Rhino Mocks 提交错误。