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POMoq and parameter attribute inheritance
 

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    <p>When I try to mock a class using Moq the method attribute gets inherited to the mock class, but not the parameter attribute.</p> <p>Basically the row "let a = (ArgumentsAttribute) p.GetCustomAttributes(typeof (ArgumentsAttribute), true).SingleOrDefault()" doesnt return the attribute.. Run the code to see where it fails.</p> <p>How do I make this test pass?</p> <pre><code>[TestFixture] public class MyTests { [Test] public void shouldFindAndCallMethodWithAttributes() { var myInterface = new Mock&lt;MyClass&gt;(); myInterface.Setup(x =&gt; x.MyMarkedMethod(1)); myInterface.Setup(x =&gt; x.MyMarkedMethod(5)); myInterface.Setup(x =&gt; x.MyMarkedMethod(9)); var executor = new MarkedMethodExecutor(); executor.FindAndCallMethodWithAttributes(myInterface.Object); myInterface.VerifyAll(); } } public class MarkedMethodExecutor { public void FindAndCallMethodWithAttributes(object anObject) { var methods = from m in anObject.GetType().GetMethods() where m.GetCustomAttributes(typeof (ExecuteMeAttribute), true).SingleOrDefault() != null select m; foreach (var method in methods) { var callInfos = from p in method.GetParameters() let a = (ArgumentsAttribute) p.GetCustomAttributes(typeof (ArgumentsAttribute), true).SingleOrDefault() where a != null select new {Parameter = p, Attribute = a}; // assume its one argument here for simplicity.. var attribute = callInfos.Single().Attribute; foreach (var argument in attribute.Arguments) { method.Invoke(anObject, new[] {argument}); } } } } public class MyClass { [ExecuteMe] public virtual void MyMarkedMethod([Arguments(1, 5, 9)] int arg) {} } [AttributeUsage(AttributeTargets.Method, AllowMultiple = false, Inherited = true)] public class ExecuteMeAttribute : Attribute {} [AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false, Inherited = true)] public class ArgumentsAttribute : Attribute { public readonly object[] Arguments; public ArgumentsAttribute(params object[] arguments) { Arguments = arguments; } } </code></pre>
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    1. COI would not use a mocking/isolation framework for this. I would test against an actual class declared within my test project. Just set a property in the marked method, call your executor, then verify that the property was set.
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