[InterfaceExport(ContractName="", ContractType=IdeaBlade.Core.Composition.ICompositionContextResolver)]
public interface ICompositionContextResolver 

// Sample ICompositionContextResolver used when using one or more custom contexts.
public class CompositionContextResolver : ICompositionContextResolver {

   public static CompositionContext myMock = new CompositionContext("MyMock", true, 
     typeof(MockEntityServerSaveInterceptor), typeof(MockEntityServerQueryInterceptor));

   public CompositionContext GetCompositionContext(string compositionContextName) {

     if (compositionContextName == myMock.Name) {
        return myMock;
     } else {
       return null;
     }
   }
}
// Sample class - note it is marked as not discoverable so that standard MEF
// composition will not find it.
[PartNotDiscoverable]
public class MockEntityServerQueryInterceptor : EntityServerQueryInterceptor {

   protected override bool ExecuteQuery() {
      throw new InvalidOperationException();
   }
}
[PartNotDiscoverable]
public class MockEntityServerSaveInterceptor : EntityServerSaveInterceptor {

   protected override bool  ExecuteSave() {
      throw new InvalidOperationException();
   }
}