Index: Ringtoets/Common/src/Ringtoets.Common.Data/FailureMechanism/ArbitraryProbabilityFailureMechanismSectionResult.cs
===================================================================
diff -u -re442812a69b3e800977c4dde61d6f64e989ef20c -r01ff726dbaa67b9e0c19390f21121ac8e6f7c277
--- Ringtoets/Common/src/Ringtoets.Common.Data/FailureMechanism/ArbitraryProbabilityFailureMechanismSectionResult.cs	(.../ArbitraryProbabilityFailureMechanismSectionResult.cs)	(revision e442812a69b3e800977c4dde61d6f64e989ef20c)
+++ Ringtoets/Common/src/Ringtoets.Common.Data/FailureMechanism/ArbitraryProbabilityFailureMechanismSectionResult.cs	(.../ArbitraryProbabilityFailureMechanismSectionResult.cs)	(revision 01ff726dbaa67b9e0c19390f21121ac8e6f7c277)
@@ -37,7 +37,10 @@
         /// Creates a new instance of <see cref="NumericFailureMechanismSectionResult"/>
         /// </summary>
         /// <param name="section">The section for which to add the result.</param>
-        public ArbitraryProbabilityFailureMechanismSectionResult(FailureMechanismSection section) : base(section) {}
+        public ArbitraryProbabilityFailureMechanismSectionResult(FailureMechanismSection section) : base(section)
+        {
+            AssessmentLayerTwoA = (RoundedDouble) 1.0;
+        }
 
         /// <summary>
         /// Gets the probability value of assessment layer two a.
Index: Ringtoets/Common/test/Ringtoets.Common.Data.Test/FailureMechanism/ArbitraryProbabilityFailureMechanismSectionResultTest.cs
===================================================================
diff -u
--- Ringtoets/Common/test/Ringtoets.Common.Data.Test/FailureMechanism/ArbitraryProbabilityFailureMechanismSectionResultTest.cs	(revision 0)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.Test/FailureMechanism/ArbitraryProbabilityFailureMechanismSectionResultTest.cs	(revision 01ff726dbaa67b9e0c19390f21121ac8e6f7c277)
@@ -0,0 +1,105 @@
+// Copyright (C) Stichting Deltares 2016. All rights reserved.
+//
+// This file is part of Ringtoets.
+//
+// Ringtoets is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System;
+using Core.Common.Base.Data;
+using Core.Common.Base.Geometry;
+using NUnit.Framework;
+using Ringtoets.Common.Data.FailureMechanism;
+
+namespace Ringtoets.Common.Data.Test.FailureMechanism
+{
+    [TestFixture]
+    public class ArbitraryProbabilityFailureMechanismSectionResultTest
+    {
+        [Test]
+        public void Constructor_WithoutSection_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate test = () => new ArbitraryProbabilityFailureMechanismSectionResult(null);
+
+            // Assert
+            var paramName = Assert.Throws<ArgumentNullException>(test).ParamName;
+            Assert.AreEqual("section", paramName);
+        }
+
+        [Test]
+        public void Constructor_WithSection_ResultCreatedForSection()
+        {
+            // Setup
+            var section = new FailureMechanismSection("Section", new[] { new Point2D(0, 0) });
+
+            // Call
+            var result = new ArbitraryProbabilityFailureMechanismSectionResult(section);
+
+            // Assert
+            Assert.IsInstanceOf<FailureMechanismSectionResult>(result);
+            Assert.AreSame(section, result.Section);
+            Assert.IsFalse(result.AssessmentLayerOne);
+            Assert.AreEqual(1, result.AssessmentLayerTwoA.Value);
+            Assert.AreEqual(0, result.AssessmentLayerTwoB.Value);
+            Assert.AreEqual(0, result.AssessmentLayerThree.Value);
+        }
+
+        [Test]
+        [TestCase(-20)]
+        [TestCase(-1e-6)]
+        [TestCase(1+1e-6)]
+        [TestCase(12)]
+        public void AssessmentLayerTwoA_ForInvalidValues_ThrowsException(double a)
+        {
+            // Setup
+            var section = new FailureMechanismSection("Section", new[] { new Point2D(0, 0) });
+            var result = new ArbitraryProbabilityFailureMechanismSectionResult(section);
+
+            // Call
+            TestDelegate test = () => result.AssessmentLayerTwoA = (RoundedDouble)a;
+
+            // Assert
+            var message = Assert.Throws<ArgumentException>(test).Message;
+            Assert.AreEqual(
+                Properties.Resources.ArbitraryProbabilityFailureMechanismSectionResult_AssessmentLayerTwoA_Value_needs_to_be_between_0_and_1, 
+                message
+            );
+        }
+
+        [Test]
+        [TestCase(0)]
+        [TestCase(1e-6)]
+        [TestCase(0.5)]
+        [TestCase(1-1e-6)]
+        [TestCase(1)]
+        public void AssessmentLayerTwoA_ForValidValues_NewValueSet(double a)
+        {
+            // Setup
+            var section = new FailureMechanismSection("Section", new[] { new Point2D(0, 0) });
+            var result = new ArbitraryProbabilityFailureMechanismSectionResult(section);
+
+            var assessmentLayerTwoAValue = (RoundedDouble)a;
+
+            // Call
+            result.AssessmentLayerTwoA = assessmentLayerTwoAValue;
+
+            // Assert
+            Assert.AreEqual(assessmentLayerTwoAValue, result.AssessmentLayerTwoA);
+        }
+    }
+}
\ No newline at end of file
Fisheye: Tag 01ff726dbaa67b9e0c19390f21121ac8e6f7c277 refers to a dead (removed) revision in file `Ringtoets/Common/test/Ringtoets.Common.Data.Test/FailureMechanism/CustomPropertyFailureMechanismSectionResultTest.cs'.
Fisheye: No comparison available.  Pass `N' to diff?
Index: Ringtoets/Common/test/Ringtoets.Common.Data.Test/Ringtoets.Common.Data.Test.csproj
===================================================================
diff -u -rb9d20365707e77623054f96f0c8b544e86658e67 -r01ff726dbaa67b9e0c19390f21121ac8e6f7c277
--- Ringtoets/Common/test/Ringtoets.Common.Data.Test/Ringtoets.Common.Data.Test.csproj	(.../Ringtoets.Common.Data.Test.csproj)	(revision b9d20365707e77623054f96f0c8b544e86658e67)
+++ Ringtoets/Common/test/Ringtoets.Common.Data.Test/Ringtoets.Common.Data.Test.csproj	(.../Ringtoets.Common.Data.Test.csproj)	(revision 01ff726dbaa67b9e0c19390f21121ac8e6f7c277)
@@ -63,7 +63,7 @@
     <Compile Include="Contribution\FailureMechanismContributionItemTest.cs" />
     <Compile Include="Contribution\FailureMechanismContributionTest.cs" />
     <Compile Include="Contribution\OtherFailureMechanismTest.cs" />
-    <Compile Include="FailureMechanism\CustomPropertyFailureMechanismSectionResultTest.cs" />
+    <Compile Include="FailureMechanism\ArbitraryProbabilityFailureMechanismSectionResultTest.cs" />
     <Compile Include="FailureMechanism\NumericFailureMechanismSectionResultTest.cs" />
     <Compile Include="FailureMechanism\FailureMechanismBaseTest.cs" />
     <Compile Include="FailureMechanism\FailureMechanismSectionResultTest.cs" />