Index: Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Data.Test/MacroStabilityInwardsCalculationScenarioTest.cs
===================================================================
diff -u -rd57b5fdfd92270ac6eff490b438bbe90f0296a4d -r2594768e09254bb5188002e2756af87e58bdda53
--- Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Data.Test/MacroStabilityInwardsCalculationScenarioTest.cs	(.../MacroStabilityInwardsCalculationScenarioTest.cs)	(revision d57b5fdfd92270ac6eff490b438bbe90f0296a4d)
+++ Ringtoets/MacroStabilityInwards/test/Ringtoets.MacroStabilityInwards.Data.Test/MacroStabilityInwardsCalculationScenarioTest.cs	(.../MacroStabilityInwardsCalculationScenarioTest.cs)	(revision 2594768e09254bb5188002e2756af87e58bdda53)
@@ -25,6 +25,7 @@
 using Core.Common.TestUtil;
 using NUnit.Framework;
 using Ringtoets.Common.Data.Calculation;
+using Ringtoets.Common.Data.TestUtil;
 using Ringtoets.MacroStabilityInwards.Data.TestUtil;
 
 namespace Ringtoets.MacroStabilityInwards.Data.Test
@@ -41,7 +42,9 @@
             // Assert
             Assert.IsInstanceOf<MacroStabilityInwardsCalculation>(scenario);
             Assert.IsInstanceOf<ICalculationScenario>(scenario);
+
             Assert.IsTrue(scenario.IsRelevant);
+            Assert.AreEqual(4, scenario.Contribution.NumberOfDecimalPlaces);
             Assert.AreEqual((RoundedDouble) 1.0, scenario.Contribution);
             Assert.AreEqual(CalculationScenarioStatus.NotCalculated, scenario.Status);
         }
@@ -62,19 +65,20 @@
         }
 
         [Test]
-        [TestCase(1)]
-        [TestCase(15.0)]
-        public void Contribution_Always_ReturnsSetValue(double newValue)
+        public void Contribution_Always_ReturnsSetValue()
         {
             // Setup
+            var random = new Random(21);
+            RoundedDouble roundedDouble = random.NextRoundedDouble();
+
             var scenario = new MacroStabilityInwardsCalculationScenario();
-            var roundedDouble = (RoundedDouble) newValue;
 
             // Call
             scenario.Contribution = roundedDouble;
 
             // Assert
-            Assert.AreEqual(roundedDouble, scenario.Contribution);
+            Assert.AreEqual(4, scenario.Contribution.NumberOfDecimalPlaces);
+            Assert.AreEqual(roundedDouble, scenario.Contribution, scenario.Contribution.GetAccuracy());
         }
 
         [Test]
@@ -147,7 +151,9 @@
                 IsRelevant = random.NextBoolean(),
                 Contribution = random.NextRoundedDouble()
             };
+
             MacroStabilityInwardsTestDataGenerator.SetRandomMacroStabilityInwardsInput(calculation.InputParameters);
+
             return calculation;
         }
     }