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POUsing Moq for an indexer property causes InvalidCastException from Castle
 

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    <p>When trying to use Moq to setup an indexer property, the underlying Castle library throws an InvalidCastException. I am using Moq 4.0.10827, the details follow. Thanks in advance if anyone can help me get the simple test (below) to run. I am rewriting unit tests with Moq and I am trying to re-do the test for the following method:</p> <pre><code>public INetwork GetInputNetwork(IInputPortMgr inPortMgr) { var port = inPortMgr[0]; return port.InputNetwork; } </code></pre> <p>The IInputPortMgr interface is as follows:</p> <pre><code>public interface IInputPortMgr { IInputPort this[int index] { get; } } </code></pre> <p>The test I wrote (and tried numerous variations) can be summarized by:</p> <pre><code>[Test] public void GetInputNetwork_Returns_InputNetwork_From_InputPort() { var mockInPortMgr = new Mock&lt;IInputPortMgr&gt;(); var mockInPort = new Mock&lt;IInputPort&gt;(); var mockNet = new Mock&lt;INetwork&gt;(); mockInPortMgr.Setup(m =&gt; m[0]).Returns(mockInPort.Object); // exception here mockInPort.Setup(m =&gt; m.InputNetwork).Returns(mockNet.Object); // Assertions Here } </code></pre> <p>But when run the unit test fails because an exception is thrown by the line</p> <p><code>mockInPortMgr.Setup(m =&gt; m[0]).Returns(mockInPort.Object);</code></p> <p>The details of the exception are:</p> <pre><code>System.InvalidCastException : Unable to cast object of type 'System.Collections.ObjectModel.ReadOnlyCollection`1[System.Reflection.CustomAttributeTypedArgument]' to type 'System.Array'. at System.Reflection.Emit.CustomAttributeBuilder.EmitValue(BinaryWriter writer, Type type, Object value) at System.Reflection.Emit.CustomAttributeBuilder.InitCustomAttributeBuilder(ConstructorInfo con, Object[] constructorArgs, PropertyInfo[] namedProperties, Object[] propertyValues, FieldInfo[] namedFields, Object[] fieldValues) at Castle.DynamicProxy.AttributeUtil.CreateBuilder(CustomAttributeData attribute) at Castle.DynamicProxy.AttributeUtil.&lt;GetNonInheritableAttributes&gt;d__0.MoveNext() at Castle.DynamicProxy.Generators.MetaProperty.BuildPropertyEmitter(ClassEmitter classEmitter) at Castle.DynamicProxy.Contributors.CompositeTypeContributor.ImplementProperty(ClassEmitter emitter, MetaProperty property, ProxyGenerationOptions options) 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`1.&lt;InitializeInstance&gt;b__0() at Moq.Mock`1.InitializeInstance() at Moq.Mock`1.OnGetObject() at Moq.Mock`1.get_Object() at Tests.Psi.Type6.Fx.Type6Fixture.GetInputNetwork() in Type6Fixture.cs: line 293 </code></pre> <p>Any ideas or could anyone point me in the right direction? Thanks.</p>
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