title: MVC WebApi - System.MissingMethodException : Method not found: 'Void System.Net.Http.ObjectContent
body: <p>I updated to the final version of MVC4 and now my tests are failing with this error:</p>
  
  <pre><code>System.MissingMethodException : Method not found: 'Void System.Net.Http.ObjectContent`1..ctor(!0, System.Net.Http.Formatting.MediaTypeFormatter, System.Net.Http.Headers.MediaTypeHeaderValue)'. 
  at System.Net.Http.HttpRequestMessageExtensions.CreateResponse(HttpRequestMessage request, HttpStatusCode statusCode, T value, HttpConfiguration configuration)
  </code></pre>
  
  <p>On my unit test I have (it was working with RC version):</p>
  
  <pre><code>var configuration = new HttpConfiguration(); 
  var request = new HttpRequestMessage(); 
  var controller = ClassUnderTest; 
  controller.Request = request; 
  controller.Request.Properties["MS_HttpConfiguration"] = configuration;
  </code></pre>
  
  <p>When I run my test I have the exception on this line of code inside the controller:</p>
  
  <pre><code>return Request.CreateResponse(HttpStatusCode.Created, myObj);
  </code></pre>
  
  <p>I tried different things but I could not fix the tests. Any ideas?</p>