Index: test/Plugins/Wti/Wti.Service.Test/PipingCalculationServiceTest.cs
===================================================================
diff -u -rcf31268a74ee4557e6ef9ccdcde7e5c48540ab8b -r1689206627a4343d07fafcebb0a931b7a0e9e2d2
--- test/Plugins/Wti/Wti.Service.Test/PipingCalculationServiceTest.cs	(.../PipingCalculationServiceTest.cs)	(revision cf31268a74ee4557e6ef9ccdcde7e5c48540ab8b)
+++ test/Plugins/Wti/Wti.Service.Test/PipingCalculationServiceTest.cs	(.../PipingCalculationServiceTest.cs)	(revision 1689206627a4343d07fafcebb0a931b7a0e9e2d2)
@@ -36,23 +36,23 @@
         public void Calculate_ValidPipingData_ShouldSetOutput()
         {
             // Call
-            PipingCalculationService.Calculate(validPipingData);
+            PipingCalculationService.PerfromValidatedCalculation(validPipingData);
 
             // Assert
             Assert.NotNull(validPipingData.Output);
         }
 
         [Test]
-        public void Calculate_InValidPipingData_ThrowsException()
+        public void Calculate_InValidPipingData_ReturnsErrorMessages()
         {
             // Setup
             var invalidPipingData = new PipingData();
 
             // Call
-            TestDelegate testDelegate = () => PipingCalculationService.Calculate(invalidPipingData);
+            var results = PipingCalculationService.PerfromValidatedCalculation(invalidPipingData);
             
             // Assert
-            Assert.Throws<PipingCalculationException>(testDelegate);
+            CollectionAssert.IsNotEmpty(results);
         }
     }
 }
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