Index: Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Merge/AssessmentSectionProviderDialogTest.cs
===================================================================
diff -u -rd1e995328e2e80a3b292492724112a5072d31ca3 -r0234a4ac9558be408d64e4645fa5f0084b33178b
--- Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Merge/AssessmentSectionProviderDialogTest.cs	(.../AssessmentSectionProviderDialogTest.cs)	(revision d1e995328e2e80a3b292492724112a5072d31ca3)
+++ Ringtoets/Integration/test/Ringtoets.Integration.Forms.Test/Merge/AssessmentSectionProviderDialogTest.cs	(.../AssessmentSectionProviderDialogTest.cs)	(revision 0234a4ac9558be408d64e4645fa5f0084b33178b)
@@ -1,6 +1,7 @@
 using System;
 using System.Drawing;
 using System.Linq;
+using System.Threading;
 using System.Windows.Forms;
 using Core.Common.Controls.DataGrid;
 using Core.Common.Controls.Dialogs;
@@ -129,6 +130,7 @@
 
                 var buttonCancel = (Button) new ButtonTester("cancelButton", dialog).TheObject;
                 Assert.AreEqual("Annuleren", buttonCancel.Text);
+                Assert.AreEqual(dialog.CancelButton, buttonCancel);
 
                 Assert.AreEqual(500, dialog.MinimumSize.Width);
                 Assert.AreEqual(350, dialog.MinimumSize.Height);
@@ -208,6 +210,29 @@
         }
 
         [Test]
+        public void GivenValidDialog_WhenSelectDataCalledAndCancelPressed_ThenSelectedDataNullAndReturnsFalse()
+        {
+            // Given
+            using (var dialogParent = new Form())
+            using (var dialog = new AssessmentSectionProviderDialog(dialogParent))
+            {
+                // When
+                bool result = dialog.SelectData(new[]
+                {
+                    TestDataGenerator.GetAssessmentSectionWithAllCalculationConfigurations()
+                });
+
+                var button = new ButtonTester("cancelButton", dialog);
+                button.Click();
+
+                // Then
+                Assert.IsFalse(result);
+                Assert.IsNull(dialog.SelectedAssessmentSection);
+                Assert.IsNull(dialog.SelectedFailureMechanisms);
+            }
+        }
+
+        [Test]
         public void GivenDialogWithAssessmentSection_WhenSelectingOtherAssessmentSection_ThenDataUpdated()
         {
             // Given