Index: test/Plugins/Wti/Wti.Service.Test/PipingCalculationServiceTest.cs
===================================================================
diff -u -r49b7320ad56bfa60788e8792b79dd537318f68ff -r97ebda114265b9ccdc6cf73bab8312e5422e3de4
--- test/Plugins/Wti/Wti.Service.Test/PipingCalculationServiceTest.cs	(.../PipingCalculationServiceTest.cs)	(revision 49b7320ad56bfa60788e8792b79dd537318f68ff)
+++ test/Plugins/Wti/Wti.Service.Test/PipingCalculationServiceTest.cs	(.../PipingCalculationServiceTest.cs)	(revision 97ebda114265b9ccdc6cf73bab8312e5422e3de4)
@@ -50,7 +50,7 @@
 
             // Assert
             Assert.AreEqual(PipingCalculationResult.Successful, result);
-            Assert.NotNull(validPipingData.Output);
+            Assert.IsNotNull(validPipingData.Output);
         }
 
         [Test]
@@ -98,7 +98,7 @@
 
             // Assert
             Assert.AreEqual(PipingCalculationResult.CalculationErrors, result);
-            Assert.Null(validPipingData.Output);
+            Assert.IsNull(validPipingData.Output);
         }
     }
 }
\ No newline at end of file