Index: Ringtoets/Piping/test/Ringtoets.Piping.Calculation.Test/PipingCalculatorTest.cs
===================================================================
diff -u -ree0616189b53da348c17a4cf75328425beaf360b -rbbca58832f24a62d39dc744c2db663ed696cfac1
--- Ringtoets/Piping/test/Ringtoets.Piping.Calculation.Test/PipingCalculatorTest.cs	(.../PipingCalculatorTest.cs)	(revision ee0616189b53da348c17a4cf75328425beaf360b)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Calculation.Test/PipingCalculatorTest.cs	(.../PipingCalculatorTest.cs)	(revision bbca58832f24a62d39dc744c2db663ed696cfac1)
@@ -31,7 +31,7 @@
             TestDelegate call = () => new PipingCalculator(new TestPipingInput().AsRealInput(), null);
             
             // Assert
-            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentNullException>(call, "PipingSubCalculatorFactory required for creating a PipingCalculator.");
+            TestHelper.AssertThrowsArgumentExceptionAndTestMessage<ArgumentNullException>(call, "IPipingSubCalculatorFactory required for creating a PipingCalculator.");
         }
 
         [Test]