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copied!<p>I think you can get away with returning <code>IEnumerable<ChangeItem></code> in your interface. It seems like <a href="http://msdn.microsoft.com/en-us/library/dd633880%28v=exchg.80%29" rel="nofollow">ChangeCollection</a> is just an implementation of <code>IEnumerable<T></code>.</p> <pre><code>public interface IEwsIntegration { IEnumerable<ItemChange> GetItems(); } </code></pre> <p>Then you can simply return a list in your setup</p> <pre><code>ewsMock.Setup(e => e.GetItems()).Returns(new List<ItemChange>()); </code></pre> <p><strong>Update:</strong></p> <p>Since you have to use properties defined only on the concrete class, you have to create an adapter.</p> <p>First create an interface with the members from the concrete class.</p> <pre><code>public interface IChangeCollection<T> : IEnumerable<T> { bool MoreChangesAvailable { get; } string SyncState { get; } } </code></pre> <p>Make sure you return this type from your interface:</p> <pre><code>public interface IEwsIntegration { IChangeCollection<ItemChange> GetItems(); } </code></pre> <p>Then you have to create an implementation of <code>IChangeCollection<T></code> which will simply direct calls to an instance of ChangeCollection.</p> <pre><code>public class ChangeCollectionAdapter<T> : IChangeCollection<T> { private readonly ChangeCollection _changeCollection; public ChangeCollectionAdapter(ChangeCollection changeCollection) { _changeCollection = changeCollection; } public bool MoreChangesAvailable { get { return _changeCollection.MoreChangesAvailable; } } //other members } </code></pre>

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