Index: test/Plugins/Wti/Wti.Calculation.Test/Piping/PipingCalculationTest.cs
===================================================================
diff -u -re61dfe357a722430029affaa9a28e6bd2cbbc281 -r77bd5fae96250f5c6e1eb7acaa848b754d44475d
--- test/Plugins/Wti/Wti.Calculation.Test/Piping/PipingCalculationTest.cs	(.../PipingCalculationTest.cs)	(revision e61dfe357a722430029affaa9a28e6bd2cbbc281)
+++ test/Plugins/Wti/Wti.Calculation.Test/Piping/PipingCalculationTest.cs	(.../PipingCalculationTest.cs)	(revision 77bd5fae96250f5c6e1eb7acaa848b754d44475d)
@@ -35,6 +35,7 @@
                 random.NextDouble());
             PipingCalculationResult actual = new PipingCalculation(input).Calculate();
 
+            Assert.That(actual, Is.Not.Null);
             Assert.That(actual.UpliftZValue, Is.Not.NaN);
             Assert.That(actual.UpliftFactorOfSafety, Is.Not.NaN);
             Assert.That(actual.HeaveZValue, Is.Not.NaN);