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    <p>It's probably a change in implementation of <code>System.Web.Mvc.JsonValueProviderFactory.GetValueProvider</code> that is hitting a value in <code>ControllerContext</code> that is null.</p> <p>You may need to mock an additional value in <code>ControllerContext</code>.</p> <p>At least that's where I'd look first.</p> <p>EDIT</p> <p>Yeah, looks like it's doing a null check on <code>controllerContext</code>. </p> <pre><code>public override IValueProvider GetValueProvider(ControllerContext controllerContext) { if (controllerContext == null) { throw new ArgumentNullException("controllerContext"); } object deserializedObject = GetDeserializedObject(controllerContext); if (deserializedObject == null) { return null; } Dictionary&lt;string, object&gt; backingStore = new Dictionary&lt;string, object&gt;(StringComparer.OrdinalIgnoreCase); AddToBackingStore(backingStore, string.Empty, deserializedObject); return new DictionaryValueProvider&lt;object&gt;(backingStore, CultureInfo.CurrentCulture); } </code></pre> <p>From the stacktrace we can see that <code>TryUpdateModel[TModel](TModel model, String prefix)</code>. Using reflector, it is accessing the <code>ControllerBase</code> <code>ValueProvider</code> property. This in turn calls <code>ValueProviderFactoryCollection.GetValueProvider(ControllerContext controllerContext)</code> with the current Controllers <code>ControllerContext</code> property.</p> <p>You should just be able to create a new <code>ControllerContext</code> instance and set the controller's property accordingly...</p> <pre><code>[TestMethod] public void EditTest { var controller = new Controller(); var controllerContext = new ControllerContext(); controller.ControllerContext = controllerContext; controller.Edit(...); } </code></pre> <p>Some additional mocking may be required to get it to fully function though. Some info on how to fully mock ControllerContext: <a href="https://stackoverflow.com/questions/32640/mocking-asp-net-mvc-controller-context">Mocking Asp.net-mvc Controller Context</a> </p>
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    1. POTryUpdateModel throws NullReferenceException in ASP.NET MVC 3 unit test
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    1. USCommunity
    1. USbmancini
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    1. COI guesst almost as much, but which value exactly do I need to mock? And how can I do this? This seems to be a pretty common scenario...
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      1. USAdrian Grigore
    2. COA common scenario for brand new code isn't that common. ;) Why don't you include your current mocks and then we could point out likely additions. Are you mocking the header?
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      1. USjfar
    3. COYeah doesn't look like the MVC3 source is available yet... that could make things bit more challenging. I'll load up Reflector and see what I can find.
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      1. USbmancini
 

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