Index: Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Readers/PipingConfigurationReaderTest.cs
===================================================================
diff -u -rd2d252d2b40a3c449f0ce7e7c7344213543af590 -r3fbce64e43a4c8bcd6928e9f5df916a0bc47c8dd
--- Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Readers/PipingConfigurationReaderTest.cs	(.../PipingConfigurationReaderTest.cs)	(revision d2d252d2b40a3c449f0ce7e7c7344213543af590)
+++ Ringtoets/Piping/test/Ringtoets.Piping.IO.Test/Readers/PipingConfigurationReaderTest.cs	(.../PipingConfigurationReaderTest.cs)	(revision 3fbce64e43a4c8bcd6928e9f5df916a0bc47c8dd)
@@ -165,7 +165,7 @@
             // Assert
             var exception = Assert.Throws<CriticalFileReadException>(call);
             Assert.IsInstanceOf<XmlSchemaValidationException>(exception.InnerException);
-            Assert.IsTrue(exception.InnerException?.Message.Contains(expectedParsingMessage));
+            StringAssert.Contains(expectedParsingMessage, exception.InnerException?.Message);
         }
 
         [Test]