Index: dam engine/trunk/src/Deltares.DamEngine.Interface.Tests/EngineInterfaceTests.cs
===================================================================
diff -u -r501 -r520
--- dam engine/trunk/src/Deltares.DamEngine.Interface.Tests/EngineInterfaceTests.cs	(.../EngineInterfaceTests.cs)	(revision 501)
+++ dam engine/trunk/src/Deltares.DamEngine.Interface.Tests/EngineInterfaceTests.cs	(.../EngineInterfaceTests.cs)	(revision 520)
@@ -50,10 +50,9 @@
             string inputString = File.ReadAllText(fileName);
             EngineInterface engineInterface = new EngineInterface(inputString);
             Assert.IsNotNull(engineInterface.DamProjectData);
-            string outputString;
-            var calculationMessages = engineInterface.Run(out outputString);
-            Assert.IsNotNull(calculationMessages);
+            string outputString = engineInterface.Run();
             Assert.IsNotNull(outputString);
+            Assert.IsNotNull(outputString);
 
         }
     }