Index: test/Plugins/Wti/Wti.Calculation.Test/Piping/PipingCalculationTest.cs
===================================================================
diff -u -r77bd5fae96250f5c6e1eb7acaa848b754d44475d -re4bd298c3f3762925531b11517a0f57b7005e5ad
--- test/Plugins/Wti/Wti.Calculation.Test/Piping/PipingCalculationTest.cs	(.../PipingCalculationTest.cs)	(revision 77bd5fae96250f5c6e1eb7acaa848b754d44475d)
+++ test/Plugins/Wti/Wti.Calculation.Test/Piping/PipingCalculationTest.cs	(.../PipingCalculationTest.cs)	(revision e4bd298c3f3762925531b11517a0f57b7005e5ad)
@@ -33,15 +33,16 @@
                 random.NextDouble(),
                 random.NextDouble(),
                 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);
-            Assert.That(actual.HeaveFactorOfSafety, Is.Not.NaN);
-            Assert.That(actual.SellmeijerZValue, Is.Not.NaN);
-            Assert.That(actual.SellmeijerFactorOfSafety, Is.Not.NaN);
+            Assert.NotNull(actual);
+            Assert.IsFalse(double.IsNaN(actual.UpliftZValue));
+            Assert.IsFalse(double.IsNaN(actual.UpliftFactorOfSafety));
+            Assert.IsFalse(double.IsNaN(actual.HeaveZValue));
+            Assert.IsFalse(double.IsNaN(actual.HeaveFactorOfSafety));
+            Assert.IsFalse(double.IsNaN(actual.SellmeijerZValue));
+            Assert.IsFalse(double.IsNaN(actual.SellmeijerFactorOfSafety));
         }
     }
 }
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