Index: Ringtoets/Common/test/Ringtoets.Common.Data.Test/FailureMechanism/FailureMechanismBaseTest.cs
===================================================================
diff -u -r72461cdacfbdea841fdf089e517e65b0e1f64a00 -r9122cc6ecd35cdc7e08a2e296524fc55371f5d4c
--- Ringtoets/Common/test/Ringtoets.Common.Data.Test/FailureMechanism/FailureMechanismBaseTest.cs	(.../FailureMechanismBaseTest.cs)	(revision 72461cdacfbdea841fdf089e517e65b0e1f64a00)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.Test/FailureMechanism/FailureMechanismBaseTest.cs	(.../FailureMechanismBaseTest.cs)	(revision 9122cc6ecd35cdc7e08a2e296524fc55371f5d4c)
@@ -99,11 +99,12 @@
         }
 
         [Test]
+        [TestCase(double.NaN)]
         [TestCase(101)]
         [TestCase(-1e-6)]
         [TestCase(-1)]
         [TestCase(100 + 1e-6)]
-        public void Contribution_ValueOutsideValidRegion_ThrowsArgumentException(double value)
+        public void Contribution_ValueOutsideValidRegionOrNaN_ThrowsArgumentException(double value)
         {
             // Setup
             var failureMechanism = new SimpleFailureMechanismBase();