Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/StochasticSoilProfileTest.cs
===================================================================
diff -u -r5e70f173b3839314912e086b6c1c784b975ee646 -r4e4ced94d27f939fc77f364201840814dc542af1
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/StochasticSoilProfileTest.cs	(.../StochasticSoilProfileTest.cs)	(revision 5e70f173b3839314912e086b6c1c784b975ee646)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/StochasticSoilProfileTest.cs	(.../StochasticSoilProfileTest.cs)	(revision 4e4ced94d27f939fc77f364201840814dc542af1)
@@ -45,6 +45,26 @@
         }
 
         [Test]
+        [TestCase(0)]
+        [TestCase(2.3)]
+        [TestCase(0.55)]
+        [TestCase(double.NaN)]
+        [TestCase(double.MaxValue)]
+        [TestCase(double.MinValue)]
+        public void AddProbability_DifferentValues_ProbabilityIncreasedAsExpected(double probabilityToAdd)
+        {
+            // Setup
+            var startProbability = new Random(21).NextDouble();
+            var profile = new StochasticSoilProfile(startProbability, SoilProfileType.SoilProfile1D, -1);
+            
+            // Call
+            profile.AddProbability(probabilityToAdd);
+
+            // Assert
+            Assert.AreEqual(startProbability + probabilityToAdd, profile.Probability);
+        }
+
+        [Test]
         public void Update_WithNullProfile_ThrowsArgumentNullException()
         {
             // Setup