Index: Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Builders/FailureMechanismSectionResultColumnBuilderTest.cs
===================================================================
diff -u -r10da55f5cb8bf1b8a8309e43f923072a29db254d -rbb5e6710b02c9c28009245953196a7088ef2e111
--- Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Builders/FailureMechanismSectionResultColumnBuilderTest.cs	(.../FailureMechanismSectionResultColumnBuilderTest.cs)	(revision 10da55f5cb8bf1b8a8309e43f923072a29db254d)
+++ Ringtoets/Common/test/Ringtoets.Common.Forms.Test/Builders/FailureMechanismSectionResultColumnBuilderTest.cs	(.../FailureMechanismSectionResultColumnBuilderTest.cs)	(revision bb5e6710b02c9c28009245953196a7088ef2e111)
@@ -690,6 +690,54 @@
             }
         }
 
+        [Test]
+        public void AddCombinedAssemblyProbabilityColumn_DataGridViewControlNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate test = () => FailureMechanismSectionResultColumnBuilder.AddCombinedAssemblyProbabilityColumn(null, "property");
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(test);
+            Assert.AreEqual("dataGridViewControl", exception.ParamName);
+        }
+
+        [Test]
+        public void AddCombinedAssemblyProbabilityColumn_DataPropertyNameNull_ThrowsArgumentNullException()
+        {
+            // Call
+            TestDelegate test = () => FailureMechanismSectionResultColumnBuilder.AddCombinedAssemblyProbabilityColumn(new DataGridViewControl(), null);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentNullException>(test);
+            Assert.AreEqual("dataPropertyName", exception.ParamName);
+        }
+
+        [Test]
+        public void AddCombinedAssemblyProbabilityColumn_WithParameters_AddsColumnToDataGridViewControl()
+        {
+            // Setup
+            using (var form = new Form())
+            using (var control = new DataGridViewControl())
+            {
+                form.Controls.Add(control);
+                form.Show();
+                var dataGridView = (DataGridView) new ControlTester("dataGridView").TheObject;
+
+                // Precondition
+                Assert.AreEqual(0, dataGridView.ColumnCount);
+
+                // Call
+                FailureMechanismSectionResultColumnBuilder.AddCombinedAssemblyProbabilityColumn(control, dataPropertyName);
+
+                // Assert
+                Assert.AreEqual(1, dataGridView.ColumnCount);
+
+                var columnData = (DataGridViewTextBoxColumn) dataGridView.Columns[0];
+                Assert.AreEqual(dataPropertyName, columnData.DataPropertyName);
+                Assert.AreEqual("Assemblageresultaat\r\ngecombineerde\r\nfaalkansschatting", columnData.HeaderText);
+            }
+        }
+
         #endregion
 
         #region Manual Assembly