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POMoq + Castle Dynamic Proxy - exception mocking nested generic interfaces
 

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    <p>I'm receiving an argument exception from Castle Dynamic Proxy, while using Moq to create a mock of object that is implementing a nested generic interface with generic method that has an interface constraint.</p> <p>The exception is: System.ArgumentException : Cannot set parent to an interface.</p> <p>Happens while accessing Object property of the mock directly after the mock creation. (Call stack is at the bottom for the sake of readability)</p> <p>The code is simple and self-describing:</p> <pre><code> public interface A&lt;T&gt; { void Method&lt;Z&gt;() where Z : T; } public interface B { } [Test] public void MockNestedGenericInterfaceTest() { Mock&lt;A&lt;B&gt;&gt; mock = new Mock&lt;A&lt;B&gt;&gt;(); var o = mock.Object; //argument exception here } </code></pre> <p>Test does not generate an exception if where Z : T clause is removed.</p> <p>I did some research and found a ticket <a href="http://code.google.com/p/moq/issues/detail?id=259" rel="nofollow" title="here">here</a>. I'm using latest versions of Moq and Castle.</p> <p>Is there a workaround for this problem? The only way I see it working is a manual mock implementation. Rhino mocks did not work for me either.</p> <p>Thank you.</p> <p>Call stack:</p> <pre><code>at System.Reflection.Emit.TypeBuilder.SetParent(Type parent) </code></pre> <p>at Castle.DynamicProxy.Generators.Emitters.GenericUtil.CopyGenericArguments(MethodInfo methodToCopyGenericsFrom, Dictionary<code>2 name2GenericType, ApplyGenArgs genericParameterGenerator) at Castle.DynamicProxy.Generators.Emitters.AbstractTypeEmitter.CopyGenericParametersFromMethod(MethodInfo methodToCopyGenericsFrom) at Castle.DynamicProxy.Generators.InvocationTypeGenerator.Generate(ClassEmitter class, ProxyGenerationOptions options, INamingScope namingScope) at Castle.DynamicProxy.Contributors.InterfaceProxyWithoutTargetContributor.GetInvocationType(MetaMethod method, ClassEmitter emitter, ProxyGenerationOptions options) at Castle.DynamicProxy.Contributors.InterfaceProxyWithoutTargetContributor.GetMethodGenerator(MetaMethod method, ClassEmitter class, ProxyGenerationOptions options, OverrideMethodDelegate overrideMethod) at Castle.DynamicProxy.Contributors.CompositeTypeContributor.ImplementMethod(MetaMethod method, ClassEmitter class, ProxyGenerationOptions options, OverrideMethodDelegate overrideMethod) at Castle.DynamicProxy.Contributors.CompositeTypeContributor.Generate(ClassEmitter class, ProxyGenerationOptions options) at Castle.DynamicProxy.Generators.InterfaceProxyWithoutTargetGenerator.GenerateType(String typeName, Type proxyTargetType, Type[] interfaces, INamingScope namingScope) at Castle.DynamicProxy.Generators.InterfaceProxyWithTargetGenerator.GenerateCode(Type proxyTargetType, Type[] interfaces, ProxyGenerationOptions options) at Castle.DynamicProxy.ProxyGenerator.CreateInterfaceProxyWithoutTarget(Type interfaceToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options, IInterceptor[] interceptors) at Moq.Proxy.CastleProxyFactory.CreateProxy(ICallInterceptor interceptor, Type[] interfaces, Object[] arguments) at Moq.Mock</code>1.b__0() at Moq.Mock<code>1.InitializeInstance() at Moq.Mock</code>1.OnGetObject() at Moq.Mock`1.get_Object() </p>
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