Index: Ringtoets/Piping/test/Ringtoets.Piping.Service.Test/PipingCalculationActivityTest.cs
===================================================================
diff -u -ra8354e83db04899a5e94b92c8803d31131a8b480 -rf109332b5185b4445e2f1b9386dc1fe4063ff20f
--- Ringtoets/Piping/test/Ringtoets.Piping.Service.Test/PipingCalculationActivityTest.cs	(.../PipingCalculationActivityTest.cs)	(revision a8354e83db04899a5e94b92c8803d31131a8b480)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Service.Test/PipingCalculationActivityTest.cs	(.../PipingCalculationActivityTest.cs)	(revision f109332b5185b4445e2f1b9386dc1fe4063ff20f)
@@ -52,6 +52,31 @@
         }
 
         [Test]
+        public void ParameteredConstructor_CalculationNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate call = () => new PipingCalculationActivity(null, new PipingProbabilityAssessmentInput(), int.MinValue, double.NaN);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("calculation", exception.ParamName);
+        }
+
+        [Test]
+        public void ParameteredConstructor_PipingProbabilityAssessmentInputNull_ThrowsArgumentNullException()
+        {
+            // Setup
+            var calculation = new PipingCalculation(new GeneralPipingInput());
+
+            // Call
+            TestDelegate call = () => new PipingCalculationActivity(calculation, null, int.MinValue, double.NaN);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(call);
+            Assert.AreEqual("pipingProbabilityAssessmentInput", exception.ParamName);
+        }
+
+        [Test]
         public void Run_InvalidPipingCalculationWithOutput_LogValidationStartAndEndWithErrors()
         {
             // Setup