Problem using mock in specific test using Resharper

      class Test
      {
         public void DoSomething()
         {
            XmlDocument doc = new XmlDocument();
            doc.Save("bork");
         }
      }

      [Test]
      [VerifyMocks]
      public void SimpleTest()
      {
         using (RecordExpectations recorder = RecorderManager.StartRecording())
         {
            XmlDocument doc = new XmlDocument();

            doc.Save("bork");
            recorder.CheckArguments();
         }

         Test test = new Test();
         test.DoSomething();
      }

TestSceneAsset.SaveFileSaves : FailedSystem.Xml.XmlException: Invalid XML document, The document does not have a root element..
at System.Xml.XmlDocument.Save(String filename)
at SiegeManaged.Editor.Model.SceneAsset.SaveFile(String path) in SceneAsset.cs: line 85
at SiegeManaged.Editor.Test.Model.TestSceneAsset.SaveFileSaves() in TestSceneAsset.cs: line 71
at TypeMock.MethodDecorator.CallRealMethod()
at TypeMock.DecoratorAttribute.CallDecoratedMethod()
at TypeMock.VerifyMocksAttribute.Execute()
at TypeMock.DecoratorAttribute.CallDecoratedMethod()
at TypeMock.ClearMocksAttribute.Execute()
at TypeMock.MethodDecorator.d()
at TypeMock.MockManager.a(String A_0, String A_1, Object A_2, Object A_3, Boolean A_4, Object[] A_5)
at TypeMock.InternalMockManager.getReturn(Object that, String typeName, String methodName, Object methodParameters, Boolean isInjected)
at SiegeManaged.Editor.Test.Model.TestSceneAsset.SaveFileSaves() in TestSceneAsset.cs: line 59