Index: Ringtoets/Common/test/Ringtoets.Common.IO.Test/HydraRing/HydraulicBoundaryDatabaseHelperTest.cs
===================================================================
diff -u -rea6fd126ba0e7080e9a2fede4559b7f439e091cd -rfd8f3552c5039e206279010483ad04bfb5b6c619
--- Ringtoets/Common/test/Ringtoets.Common.IO.Test/HydraRing/HydraulicBoundaryDatabaseHelperTest.cs	(.../HydraulicBoundaryDatabaseHelperTest.cs)	(revision ea6fd126ba0e7080e9a2fede4559b7f439e091cd)
+++ Ringtoets/Common/test/Ringtoets.Common.IO.Test/HydraRing/HydraulicBoundaryDatabaseHelperTest.cs	(.../HydraulicBoundaryDatabaseHelperTest.cs)	(revision fd8f3552c5039e206279010483ad04bfb5b6c619)
@@ -226,8 +226,7 @@
             string message = HydraulicBoundaryDatabaseHelper.ValidatePreprocessorDirectory(invalidEmptyPath);
 
             // Assert
-            string expectedMessage = $"De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. Het bestandspad moet opgegeven zijn.";
-            Assert.AreEqual(expectedMessage, message);
+            Assert.AreEqual("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. Het bestandspad moet opgegeven zijn.", message);
         }
 
         [Test]
@@ -247,8 +246,7 @@
             string message = HydraulicBoundaryDatabaseHelper.ValidatePreprocessorDirectory(tooLongFolderPath);
 
             // Assert
-            string expectedMessage = $"De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. Het bestandspad is te lang.";
-            Assert.AreEqual(expectedMessage, message);
+            Assert.AreEqual("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. Het bestandspad is te lang.", message);
         }
 
         [Test]
@@ -261,8 +259,7 @@
             string message = HydraulicBoundaryDatabaseHelper.ValidatePreprocessorDirectory(folderWithInvalidColonCharacter);
 
             // Assert
-            string expectedMessage = $"De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. Het bestandspad bevat een ':' op een ongeldige plek.";
-            Assert.AreEqual(expectedMessage, message);
+            Assert.AreEqual("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. Het bestandspad bevat een ':' op een ongeldige plek.", message);
         }
 
         [Test]
@@ -298,8 +295,7 @@
             string message = HydraulicBoundaryDatabaseHelper.ValidatePreprocessorDirectory(nonExistingFolder);
 
             // Assert
-            string expectedMessage = $"De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.";
-            Assert.AreEqual(expectedMessage, message);
+            Assert.AreEqual("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", message);
         }
     }
 }
\ No newline at end of file
Index: Ringtoets/Common/test/Ringtoets.Common.Service.Test/DesignWaterLevelCalculationActivityTest.cs
===================================================================
diff -u -rb282e7cc12bd468b577bb8afc20e3b0720d6d1be -rfd8f3552c5039e206279010483ad04bfb5b6c619
--- Ringtoets/Common/test/Ringtoets.Common.Service.Test/DesignWaterLevelCalculationActivityTest.cs	(.../DesignWaterLevelCalculationActivityTest.cs)	(revision b282e7cc12bd468b577bb8afc20e3b0720d6d1be)
+++ Ringtoets/Common/test/Ringtoets.Common.Service.Test/DesignWaterLevelCalculationActivityTest.cs	(.../DesignWaterLevelCalculationActivityTest.cs)	(revision fd8f3552c5039e206279010483ad04bfb5b6c619)
@@ -208,7 +208,7 @@
                 Assert.AreEqual(4, msgs.Length);
                 Assert.AreEqual($"{activityDescription} is gestart.", msgs[0]);
                 CalculationServiceTestHelper.AssertValidationStartMessage(msgs[1]);
-                StringAssert.StartsWith("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[2]);
+                Assert.AreEqual("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[2]);
                 CalculationServiceTestHelper.AssertValidationEndMessage(msgs[3]);
             });
             Assert.AreEqual(ActivityState.Failed, activity.State);
Index: Ringtoets/Common/test/Ringtoets.Common.Service.Test/DesignWaterLevelCalculationServiceTest.cs
===================================================================
diff -u -rb282e7cc12bd468b577bb8afc20e3b0720d6d1be -rfd8f3552c5039e206279010483ad04bfb5b6c619
--- Ringtoets/Common/test/Ringtoets.Common.Service.Test/DesignWaterLevelCalculationServiceTest.cs	(.../DesignWaterLevelCalculationServiceTest.cs)	(revision b282e7cc12bd468b577bb8afc20e3b0720d6d1be)
+++ Ringtoets/Common/test/Ringtoets.Common.Service.Test/DesignWaterLevelCalculationServiceTest.cs	(.../DesignWaterLevelCalculationServiceTest.cs)	(revision fd8f3552c5039e206279010483ad04bfb5b6c619)
@@ -127,7 +127,7 @@
                 string[] msgs = messages.ToArray();
                 Assert.AreEqual(3, msgs.Length);
                 CalculationServiceTestHelper.AssertValidationStartMessage(msgs[0]);
-                StringAssert.StartsWith("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[1]);
+                Assert.AreEqual("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[1]);
                 CalculationServiceTestHelper.AssertValidationEndMessage(msgs[2]);
             });
             Assert.IsFalse(valid);
Index: Ringtoets/Common/test/Ringtoets.Common.Service.Test/Structures/StructuresCalculationServiceBaseTest.cs
===================================================================
diff -u -rce2f5204ae5a2e0740ec359eb27934e878631b36 -rfd8f3552c5039e206279010483ad04bfb5b6c619
--- Ringtoets/Common/test/Ringtoets.Common.Service.Test/Structures/StructuresCalculationServiceBaseTest.cs	(.../StructuresCalculationServiceBaseTest.cs)	(revision ce2f5204ae5a2e0740ec359eb27934e878631b36)
+++ Ringtoets/Common/test/Ringtoets.Common.Service.Test/Structures/StructuresCalculationServiceBaseTest.cs	(.../StructuresCalculationServiceBaseTest.cs)	(revision fd8f3552c5039e206279010483ad04bfb5b6c619)
@@ -151,7 +151,7 @@
                 string[] msgs = messages.ToArray();
                 Assert.AreEqual(3, msgs.Length);
                 CalculationServiceTestHelper.AssertValidationStartMessage(msgs[0]);
-                StringAssert.StartsWith("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[1]);
+                Assert.AreEqual("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[1]);
                 CalculationServiceTestHelper.AssertValidationEndMessage(msgs[2]);
             });
             Assert.IsFalse(isValid);
Index: Ringtoets/Common/test/Ringtoets.Common.Service.Test/WaveHeightCalculationActivityTest.cs
===================================================================
diff -u -rb282e7cc12bd468b577bb8afc20e3b0720d6d1be -rfd8f3552c5039e206279010483ad04bfb5b6c619
--- Ringtoets/Common/test/Ringtoets.Common.Service.Test/WaveHeightCalculationActivityTest.cs	(.../WaveHeightCalculationActivityTest.cs)	(revision b282e7cc12bd468b577bb8afc20e3b0720d6d1be)
+++ Ringtoets/Common/test/Ringtoets.Common.Service.Test/WaveHeightCalculationActivityTest.cs	(.../WaveHeightCalculationActivityTest.cs)	(revision fd8f3552c5039e206279010483ad04bfb5b6c619)
@@ -190,7 +190,7 @@
                 Assert.AreEqual(4, msgs.Length);
                 Assert.AreEqual($"{activityDescription} is gestart.", msgs[0]);
                 CalculationServiceTestHelper.AssertValidationStartMessage(msgs[1]);
-                StringAssert.StartsWith("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[2]);
+                Assert.AreEqual("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[2]);
                 CalculationServiceTestHelper.AssertValidationEndMessage(msgs[3]);
             });
             Assert.AreEqual(ActivityState.Failed, activity.State);
Index: Ringtoets/Common/test/Ringtoets.Common.Service.Test/WaveHeightCalculationServiceTest.cs
===================================================================
diff -u -rb282e7cc12bd468b577bb8afc20e3b0720d6d1be -rfd8f3552c5039e206279010483ad04bfb5b6c619
--- Ringtoets/Common/test/Ringtoets.Common.Service.Test/WaveHeightCalculationServiceTest.cs	(.../WaveHeightCalculationServiceTest.cs)	(revision b282e7cc12bd468b577bb8afc20e3b0720d6d1be)
+++ Ringtoets/Common/test/Ringtoets.Common.Service.Test/WaveHeightCalculationServiceTest.cs	(.../WaveHeightCalculationServiceTest.cs)	(revision fd8f3552c5039e206279010483ad04bfb5b6c619)
@@ -127,7 +127,7 @@
                 string[] msgs = messages.ToArray();
                 Assert.AreEqual(3, msgs.Length);
                 CalculationServiceTestHelper.AssertValidationStartMessage(msgs[0]);
-                StringAssert.StartsWith("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[1]);
+                Assert.AreEqual("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[1]);
                 CalculationServiceTestHelper.AssertValidationEndMessage(msgs[2]);
             });
             Assert.IsFalse(valid);
Index: Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Service.Test/DuneErosionBoundaryCalculationActivityTest.cs
===================================================================
diff -u -rb282e7cc12bd468b577bb8afc20e3b0720d6d1be -rfd8f3552c5039e206279010483ad04bfb5b6c619
--- Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Service.Test/DuneErosionBoundaryCalculationActivityTest.cs	(.../DuneErosionBoundaryCalculationActivityTest.cs)	(revision b282e7cc12bd468b577bb8afc20e3b0720d6d1be)
+++ Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Service.Test/DuneErosionBoundaryCalculationActivityTest.cs	(.../DuneErosionBoundaryCalculationActivityTest.cs)	(revision fd8f3552c5039e206279010483ad04bfb5b6c619)
@@ -142,7 +142,7 @@
 
                 Assert.AreEqual($"Hydraulische randvoorwaarden berekenen voor locatie '{locationName}' is gestart.", msgs[0]);
                 CalculationServiceTestHelper.AssertValidationStartMessage(msgs[1]);
-                StringAssert.StartsWith("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[2]);
+                Assert.AreEqual("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[2]);
                 CalculationServiceTestHelper.AssertValidationEndMessage(msgs[3]);
             });
             Assert.AreEqual(ActivityState.Failed, activity.State);
Index: Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Service.Test/DuneErosionBoundaryCalculationServiceTest.cs
===================================================================
diff -u -rb282e7cc12bd468b577bb8afc20e3b0720d6d1be -rfd8f3552c5039e206279010483ad04bfb5b6c619
--- Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Service.Test/DuneErosionBoundaryCalculationServiceTest.cs	(.../DuneErosionBoundaryCalculationServiceTest.cs)	(revision b282e7cc12bd468b577bb8afc20e3b0720d6d1be)
+++ Ringtoets/DuneErosion/test/Ringtoets.DuneErosion.Service.Test/DuneErosionBoundaryCalculationServiceTest.cs	(.../DuneErosionBoundaryCalculationServiceTest.cs)	(revision fd8f3552c5039e206279010483ad04bfb5b6c619)
@@ -124,7 +124,7 @@
                 string[] msgs = messages.ToArray();
                 Assert.AreEqual(3, msgs.Length);
                 CalculationServiceTestHelper.AssertValidationStartMessage(msgs[0]);
-                StringAssert.StartsWith("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[1]);
+                Assert.AreEqual("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[1]);
                 CalculationServiceTestHelper.AssertValidationEndMessage(msgs[2]);
             });
             Assert.IsFalse(valid);
Index: Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Service.Test/GrassCoverErosionInwardsCalculationServiceTest.cs
===================================================================
diff -u -r5c2499b69a603d92787acc9118bfc5a9da3c5d30 -rfd8f3552c5039e206279010483ad04bfb5b6c619
--- Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Service.Test/GrassCoverErosionInwardsCalculationServiceTest.cs	(.../GrassCoverErosionInwardsCalculationServiceTest.cs)	(revision 5c2499b69a603d92787acc9118bfc5a9da3c5d30)
+++ Ringtoets/GrassCoverErosionInwards/test/Ringtoets.GrassCoverErosionInwards.Service.Test/GrassCoverErosionInwardsCalculationServiceTest.cs	(.../GrassCoverErosionInwardsCalculationServiceTest.cs)	(revision fd8f3552c5039e206279010483ad04bfb5b6c619)
@@ -171,7 +171,7 @@
                 string[] msgs = messages.ToArray();
                 Assert.AreEqual(3, msgs.Length);
                 CalculationServiceTestHelper.AssertValidationStartMessage(msgs[0]);
-                StringAssert.StartsWith("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[1]);
+                Assert.AreEqual("De bestandsmap waar de preprocessor bestanden opslaat is ongeldig. De bestandsmap bestaat niet.", msgs[1]);
                 CalculationServiceTestHelper.AssertValidationEndMessage(msgs[2]);
             });
             Assert.IsFalse(isValid);